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What does HVAC stand for?
HVAC (pronounced h-vack or spelled out) stands for Heating, Ventilating and Air Conditioning. The three functions of heating, ventilating, and air-conditioning are closely interrelated. All seek to provide thermal comfort, acceptable indoor air quality, and reasonable installation, operation, and maintenance costs. HVAC systems can provide ventilation, reduce air infiltration, and maintain pressure relationships between spaces. Your heating and air technician goes by the name of HVAC contractor, and can provide heating repair expertise.

What is a central air conditioning system?
The most common central cooling system is a split system, which includes an outdoor cabinet containing a condenser coil and compressor, and an indoor evaporator coil, usually installed in conjunction with your furnace or air handler. The compressor pumps a chemical called refrigerant through the system.

What are ductless mini split air conditioners ?
Like the central air conditioner units, mini split air conditioners have two main components: an outdoor compressor/condenser, and an indoor air-handling unit. A conduit, which houses the power cable, refrigerant tubing, suction tubing, and a condensate drain, links the outdoor and indoor units through a small hole (3 inches usually) that is drilled in the wall of the building. The main advantages of split air conditioners are their small size and flexibility for zoning or heating and cooling individual rooms. Some split air conditioners can have as many as four indoor air handling units (for four zones or rooms) connected to one outdoor unit. The number depends on how much heating or cooling is required for the building or each zone (which is also affected by how well the building is insulated). Since each of the split air conditioner zones/rooms will have it's own thermostat, you only need to condition that area when someone is present, which saves energy and money. If you are in a office building at a higher floor, you can also install Outside Compressor using our Wall Bracket. Replacing an existing zonal heating system – Ductless systems are ideal for replacing or supplementing inefficient electric baseboard, wall or ceiling units, woodstoves and other space heaters such as propane or kerosene. A cost effective electric heat conversion in a small house might consist of single system serving the main area of the house, while leaving existing electric baseboards in bedrooms and bathrooms.

Room additions – A ductless system can also be implemented when a room is added onto a house or an attic is converted to living space. Rather than extending the home’s existing ductwork or pipes, or adding electric resistance heaters, the ductless system can provide efficient heating and cooling.

New construction – New home designs can be adapted to take advantage of a ductless system’s many benefits. One or more systems might be installed in various “zones” of the house to simplify installation and minimize refrigerant line length.

What is a portable air conditioner?
A portable air conditioner is a self-contained free standing unit that typically sits within the area that is intended to be cooled – providing traditional ‘refrigerant driven’ air conditioned air.

What is a Window Air Conditioner? How does a window air conditioner work?
Window air conditioners Comes in the form of a single box. It is easy to fit on a window or wall frame. This costs lesser than Split AC, but is slightly noisier than Split AC. Not much scope for aesthetics – internally and externally for the building. They work on exactly the same principles as a refrigerator or dehumidifier. They have a cooling system that refrigerates the air entering the unit. The moisture in the air condenses on the cold coils and drips into the bottom tray of the air conditioner. The warm air in the room is drawn over the evaporator coil, which collect heat. The heat is conducted into a refrigerant gas. The gas is then circulated to the condensing coils on the back of the unit where it is dissipated to the outside.

What are Packaged Terminal AC?
Packaged terminal air conditioning units, PTACs, are typically selected where individual zones have an outside wall and are conditioned separately with individual occupant control. PTACs are well suited to hotels, motels, nursing homes and apartments. As the name implies, a single package contains all the components of an air-cooled refrigeration and air-handling system in an individual package.

Units are designed for through-the-wall installation, with decorative outdoor grilles as an option. Units are also available with various heating options-electric resistance or hydronic. Other variations include the Packaged Terminal Heat Pump (PTHP).

What is Ceiling Suspended Air Conditioning?
Ceiling suspended air conditioners are extremely discreet, with only the grill showing in the ceiling. The air conditioner automatically adjusts its performance to meet the changing needs of the space while maintaining the desired temperature. Ceiling cassette systems provide both heating and cooling and are popular in commercial applications such as offices, conference rooms, restaurants, night clubs and bars, as well as new construction condominiums and homes.

What are Concealed Duct Units?
Made for the area where you need concealed air conditioning. Concealed duct units, as the name suggest, cand be seated above the ceiling where they can be hidden. DC inverter swing compressor is very quiet in operation. The result is a reduced sized DC compressor which, in addition to providing greater performance, allows the appliance to heat up efficiently even when the outside temperature is very low. The outdoor units are neat, sturdy and can easily be mounted on a roof or terrace or simply placed against an outside wall. Whisper quiet operation sound pressure level, unlike conventional systems providing greater room temperature stability and comfort with limited noise.

What is difference between air conditioning, comfort cooling and close control?
Air conditioning covers many things but is mainly, heating, cooling, ventilation, fresh air, filtration and control of humidity.Comfort cooling mainly relates to provision of just cooling to improve comfort.Close control air conditioning is really as the name implies, both temperature, humidity and air cleanliness are closely controlled and often to fine tolerances if necessary.

How to Compare Air Conditioner Efficiencies?
An air conditioner can keep you cool on a hot summer day. Room models confine comfort to one area and central air versions handle your entire home. Because these machines use enormous amounts of energy when they are turned on, you can minimize your utility expenses by buying the models with the best efficiencies.

Size
You may have the most efficient air conditioner in the world but it may still cost too much money to run because it is the incorrect size for your space. To determine the right size, multiply the length and width of each space that you want cooled. The result is the square footage of your room, which governs cooling capacity. This environmental ability is expressed in British Thermal Units or BTUs, which is generally listed on the air conditioner's label or specifications. A BTU is defined as the energy needed to increase the temperature of a pound of water by one degree Fahrenheit under normal atmospheric pressure.

Size Example
For rooms measuring 150 square feet or less, you need 5,000 BTUs. About 150 to 250 square feet need 6,000 BTUs, 300 to 350 square feet need 8,000 BTUs, 1,000 to 1,200 square feet need 21,000 BTUs, and 1,500 to 2,000 square feet need 30,000 BTUs. For central air conditioning systems, total the BTUs needed for each room and allow about two tons for every 24,000 BTUs. For more accurate sizing, contact a cooling contractor who can use Manual J as published by the Air Conditioning Contractors of America. This document takes into account the orientation, insulation, number of windows, climate, number of occupants and desired comfort level of the home.

SEER
The U.S. Department of Energy regulates the efficiency of central air conditioners through a rating known as the Seasonal Energy Efficiency Ratio or SEER. This calculation divides the BTUs used by a unit normally in one year by the watt-hours of energy it needs during the same time. A higher rating is more efficient. Since January 2006, all central air conditioning units sold in the U.S. need a SEER of 13. Upgrading your unit from SEER 9 to SEER 14 reduces cooling energy use by at least 35 percent.

EER
The Energy Efficiency Ratio or EER is the SEER equivalent for room air conditioners. However, this figure measures energy use instantaneously rather than over a season. Appliance standards mandate an EER of 8 to 9.8 or greater, depending on type and capacity. Replacing an old unit with an EER of 5 with a modern one having an EER of 10 cuts your cooling energy use by half.

Comparisons
You need neither air conditioning knowledge nor complex calculations to find the efficiency rating of an air conditioner. This information is listed on the yellow EnergyGuide label required for all appliances. This label also gives you the estimated yearly operating cost of using the device, so you can translate the rating into real-world terms. Information is also available on the manufacturer’s websites. Look for the Energy Star designation on the yellow label, which means the product meets the energy efficiency guidelines demanded by the Environmental Protection Agency. Central air conditioners need a SEER of at least 14 to meet this standard. Room air conditioners need an EER that is close to 10.

My bed room doesn’t have the window provision; is it possible to use a window AC?
You can easily make a small opening in the wall and install the AC. Make sure that the supporting metal brackets, interior angles, etc. are structurally fastened to the building envelope and are strong enough for the size and weight of the AC unit.

How does a window air conditioner work?
Window air conditioners work on exactly the same principles as a refrigerator or dehumidifier. They have a cooling system that refrigerates the air entering the unit. The moisture in the air condenses on the cold coils and drips into the bottom tray of the air conditioner. The warm air in the room is drawn over the evaporator coil, which collect heat. The heat is conducted into a refrigerant gas. The gas is then circulated to the condensing coils on the back of the unit where it is dissipated to the outside.

Are window air conditioners expensive to run?
Yes. They use a considerable amount of electricity. A standard single room air conditioner will cost approximately 7-12 cents per hour to operate. If you run the air conditioner for 8 hours per day it will cost you approximately $24.40 per month at $.10 per kilowatt hour.

Why use a window air conditioner?
Window AC's have many benefits such as reduced space requirements, better efficiency and ease of use. Plus, they work in almost all environments: dry or wet. They cool effectively and keep moisture levels down too. Many options offer adjustable thermostats for cooling control, quiet operation for nightttime cooling, and most models include either an Energy Star rating or economy setting to save you money on your energy bill.

What if Water leaking from the rear of a window air conditioner?
Water leaking from the rear of a window air conditioner is not unusual, especially when humidity levels are high. If water is being dumped outside then the machine is operating properly. Its primary job is to remove moisture from inside the home and dispose of it outside. If in an apartment building then a bucket under the rear of the air conditioner can stop it from leaking onto your downstairs neighbours.

Should I buy a Split AC or a Window AC?
It is possible that the circuit breaker for the compressor unit is thrown (switched to "off"). Go outside to the compressor unit and follow the big cable up to the circuit breaker panel on the wall. If it is off, throw the switch to "on." If that is not the problem, something is probably wrong with the compressor unit. Turn off the breaker panel and call a repairman.

To what distance will a Window AC or Split AC throw air?
A normal Window AC or split AC will throw air upto 15 feet. However, special Split units are available to throw air upto 30 feet.

What is the ideal location for a Window AC?
At a height of 5 feet behind you. Ensure that the AC air from the airconditioner does not hit you directly.

What part of the house or apartment would be most efficient for placement of a window unit air conditioner?
shade side of largest room And on the upper level if you want cool two floors. But in that case, "most efficient" would require two units, one upstairs and one downstairs. In fact, greater efficiencies (your question did ask about efficiency, not initial cost or practicality) can be gained with multiple smaller units in various rooms, than with one big unit.

What causes the compressor of a window air conditioner to come on for a few seconds then shut off then back on in a short period of time no mater what the temperature setting?
Could be very dirty and the lack of air flow is tripping the limit, could be the comp is seizing. This situation could be due to the cold air output gets sucked back immediately into the unit causing the thermostat to cut out. Make sure that the sponge seal between the outlet air and the return air is in place, it is just behind the front cover.

What causes a window air conditioner to freeze?
You either have a dirty air filter or the unit is leaking refrigerant and is undercharged. The first answer is the best bet, but also make sure the out side coils are not covered up with vines.

Why does a one-year-old window unit have a small amount of red oily substance showing up in the drain pan?
It may be lubricating oil leaking from the compressor. Have the unit serviced before any futher use.

Which Air conditioner is preferable – Window or Split AC?
Both types of ACs offer different features and advantages to the users.

In hot weather, should I turn my thermostat up when I leave for work in the morning ?
If your house is going to be empty for more than about four hours, it's a good idea to turn your thermostat up to about 82 degrees or so instead of the 78 usually recommended. Keep the house closed to minimize heat build up. When you come home, don't set the thermostat any lower than the temperature you actually want your air conditioning system wouldn't cool any faster and might easily waste money by cooling your home more than needed.

Do Heat Pumps cause stuffiness?
No. Unlike fires and glowing electrical elements, heat pumps don’t burn oxygen.

How to Cool my home naturally?
There are many techniques that can help cool your home naturally. Check your use of appliances according to this article on cooling your house naturally an incandescent light bulb emits up to 90% of its energy as heat. Keep your windows shaded preventing direct sunlight into your house. Avoid warm air from coming in from outside. Use deciduous trees to allow light in winter and shade in summer.

What's wrong with your AC if the tubes are freezing and the air is not as cold ?
It is freezing up. We find this problem occurs particularly when it cools off somewhat outside. Turn your a/c temperature up, and your fan speed to high. This helps to keep it from freezing. More than likely you are low on refrigerant. Have you had the pressures checked. Also check you filter and ensure it is not dirty.

In hot weather, should I turn my thermostat up when I leave for work in the morning ?
If your house is going to be empty for more than about four hours, it's a good idea to turn your thermostat up to about 82 degrees or so instead of the 78 usually recommended. Keep the house closed to minimize heat build up. When you come home, don't set the thermostat any lower than the temperature you actually want your air conditioning system wouldn't cool any faster and might easily waste money by cooling your home more than needed.

How long should my system run in a cycle?
There is no exact answer for how long your system should run during each cycle. The average air conditioner is sized to remove the heat from your home as fast as it comes in, on a 100° day. Therefore, ideally, on a 100° day the system should be able to keep up with the incoming heat, but not gain on it and be able to turn off. The cooler it is below 100°, the more the system will cycle on and off.

How are the sizing capacities of heating and cooling systems measured?
Heating and cooling systems sizing is based on B.T.U.H. (British Thermal Units Per Hour). Air Conditioning and Heat Pumps are also rated in tonnage. 12,000 BTUH equals one (1) ton. Residential systems can range from 1 to 5 tons.

How important is it to have a quiet heating and air conditioning system?
Extremely important. Sound intensity is measured in units called decibels (dB). A normal conversation is about 60-70 dB. A telephone dial tone produces 80 dB; a lawn mower produces 107 dB or more. Sustained exposure to sound levels of 90-95 dB may lead to hearing loss, so it’s important to own the quietest heating and cooling system you possibly can.

Why are humidifiers used more in heating than cooling?
The average comfort range for relative humidity in a home is from 30 to 35%. When cool outdoor air enters your home, it tends to dry out as it warms up, which can cause static electricity build-up and sinus problems. A humidifier will add moisture back into the air and minimize these problems during the winter months. However the humidity level achieved in a home is effected by how tight a home is, how often the doors open and close size and style of humidifier.

What is two-stage cooling?
Two-stage cooling means the air conditioner (or heat pump product) has a compressor with two levels of operation: high for hot summer days and low for milder days. Since the low setting is adequate to meet household cooling demands 80% of the time, a two-stage unit runs for longer periods and produces more even temperatures.

Longer cooling cycles also translate to quieter, more efficient operation and enhanced humidity control. Compared to a single stage unit, a two stage air conditioner (or heat pump) can remove twice as much moisture from the air. This is important because when moisture levels are high, there's a higher potential for mold and other pollutant problems.

Should I change my indoor coil?
When replacing your air conditioner or heat pump, the answer is most likely yes. The efficiency ratings that are advertised for an air conditioner or heat pump are based on the performance as part of a matched system. If only the outdoor portion is changed, the efficiency and savings could be less than that of a matched system.

How does Humidifier work?
A neglected in-duct humidifier can breed mildew and bacteria, not to mention add too much moisture to a house. A common mistake with humidifiers is leaving them on after the heating season ends. Don't forget to pull the plug, shut the water valve, and drain the unit. A unit with a water reservoir should be drained and cleaned with white vinegar, a mix of one part chlorine bleach to eight parts water, or muriatic acid. Mist-type humidifiers also require regular cleaning to remove mineral deposits.

How long can I expect a new system to last?
If you have a qualified technician perform regular preventative maintenance and service suggested for your unit, industry averages suggest that an air conditioner should last 12-15 years (sea coast applications may be less) and a gas furnace should last as many as 20-25 years.

What is the best type of system to meet all indoor comfort needs?
1. If you smell gas, please contact the gas supplier from your neighbor's phone. Do not light any appliance, touch any electrical switch or use a phone inside your home. If you cannot reach the gas supplier, please call 911.

2. If you have no electricity, your furnace will not work. Please call your utility company.

3. If you have a digital thermostat and it is not displaying a temperature, replace your batteries in the thermostat. 4.If the furnace is on, but no air is coming through the vents, call a technician for repair work.

Does my house need surge protection for the HVAC system?
When the HVAC did not have any PC boards the surge protection was not needed, but when manufacturers started using electronics, this requires protection against lightning. Most manufacturers use some form of electronics on modern HVAC equipment.

What does HVAC stand for?
HVAC (pronounced h-vack or spelled out) stands for Heating, Ventilating and Air Conditioning. The three functions of heating, ventilating, and air-conditioning are closely interrelated. All seek to provide thermal comfort, acceptable indoor air quality, and reasonable installation, operation, and maintenance costs. HVAC systems can provide ventilation, reduce air infiltration, and maintain pressure relationships between spaces. Your heating and air technician goes by the name of HVAC contractor, and can provide heating repair expertise.

How does my heating and air conditioning system move air throughout my home?
A fan draws indoor air in through vents called return grills located throughout your home. The air travels through ducts that run to your systems’ air handler, where it is returned into the conditioned space through supply vents or registers in your wall, ceilings or floors.

Can I Leave my door and window open while using air conditioner?
You can leave windows and doors open, but it’s not a very good idea if you are trying to heat or cool your room. If you are trying to cool down a room, it’s best to close the curtains, blinds and windows during the hottest part of the day. This will keep your home cooler and prevent your air conditioner from having to work harder or having to use more energy then it has to.

What Are the Advantages of Ductless Technology?
Ductless HVAC and AC systems offer a variety of advantages that may prove both practical and cost-effective for your home. Some of the main features and benefits that homeowners appreciate about ductless systems follow:
With a ductless system, the temperature of each room or zone can be individually controlled.

For AC models, the indoor unit for each room or zone can be individually set for cooling, ventilation or dehumidification. Heat pump models also offer a heating option.

A conventional HVAC air distribution system, or duct system, is not required for system operation.

A ductless HVAC system can be used to cool or heat your entire living space. It can also supplement your existing HVAC system or condition hard-to-reach areas of your home.

Ductless systems are fully customizable, allowing you to mix and match indoor and outdoor units to create the system that most closely meets your needs.

Ductless systems can be as much as 50 percent more energy efficient than similar-capacity ducted models.

A ductless system consists of a single outdoor unit connected to one or more indoor units, which can allow the homeowner to save even more money on utilities by using only those units that condition occupied rooms.

A ductless air conditioner can be used in places where portable window air conditioners can't — such as in a room that doesn't contain a window.

Ductless systems maximize efficiency by eliminating the warm or cool air losses that typically occur with traditional ductwork.

Ductless systems eliminate the need for duct cleaning, maintenance and repair.

Ductless HVAC systems operate more quietly than their ducted counterparts.

How does insulation affect my cooling needs?
A poorly shaded home with little insulation and lots of air leaks might need a ton of air conditioning for every 400 square feet of floor area. A well insulated and well-shaded home with few air leaks might only need one ton per 1000 square feet.

Contractors size air conditioning systems using computer programs or extensive hand calculations. To ensure correct sizing, ask your contractor to show you the written calculations for your home. Then have them install the smallest size air conditioner capable of cooling your home.

What is meant by a ‘ton’ of refrigeration?
Confusingly, the unit has little to do with weight, as used in everyday language. One ton of refrigeration is the term used to refer to 12,000 B.T.U.s/hour (British Thermal Units/Hour) of cooling effect. Thus, a condensing unit with a cooling capacity of 60,000 B.T.U.s/hour is said to have a capacity of 5 tons.

What is radon?
Radon is an invisible, radioactive atomic gas that results from the radioactive decay of radium, which may be found in rock formations beneath buildings or in certain building materials themselves. Radon is probably the most pervasive serious hazard for indoor air quality in the United States and probably responsible for thousands of deaths from lung cancer each year. Proper testing can be done for the presence of radon and measures taken to minimize it affects.

What is a Zoning System for HVAC?
Zoning divides your home into separate comfort areas and makes your comfort equipment cool or heat only areas that need conditioning. For example, a living room with large windows may stay too hot in the
summer and too cold in the winter. A zoning system will send more conditioned air to the living room to make up for the heat gained or lost through the windows.

Why zone? Today's families have different lifestyles and comfort needs. Maybe you have a home office that needs extra conditioning during the day and none at night. Or you only use the upstairs or back bedrooms when guests visit. Whatever your needs, zoning can keep each area of your house at the perfect temperature for you and each family member.

When should I install zoning? If you are replacing your air conditioner, furnace or heat pump, it is an excellent time to install a zoning system. When you new comfort equipment is matched with a zoning system, you will have precise control in each zone. Houses that had been nearly impossible to keep comfortable are a thing of the past. Zoning is also excellent for new homes since it is installed during construction. If you are buying a new home, check with your builder about a zoning system. It could make the difference between just enjoying your new house and being truly comfortable in it.

What causes ice to build up in an air conditioner?
Icing can be caused by a number of factors. Units that have not been cleaned over a long period of time may have coils and fins clogged by dust, dirt or debris. Clogged coils and fins restrict air flow through the unit, which can cause the compressor to work even harder – so hard, that it may reduce the coil temperature below the normal range in an attempt to make up for the lost cooling power from the blocked coils. Another potential cause is running a unit with a very cold set point (i.e. turning the target temperature down very low) on low fan speed for an extended period of time. This can cause excess condensate to build up on the coils, further lowering the temperature of the coil and leading to icing.

What is the estimated electrical consumption of an air conditioner per month?
The estimated electrical consumption can be calculated by using the following formula:
Estimated Electrical Consumption = Input (kW) X No. of hours used X No. of days per month X Current Utility Rate.

How do air conditioners remove humidity from the room?
The evaporator coils on the front of the air conditioner get very cold during normal operation of the air conditioner. As the warm moist air in the room comes in contact with the cold evaporator the moisture in the air condenses out of the air and attaches to the evaporator coil. As more and more moisture condenses the water begins to drip down into the base of the air conditioner where it is evaporated to the outside of the house.

How can I increase the output to cool more areas?
If only one unit is used and you want to cool other areas of the house, you can attempt to increase the output by placing a fan in the doorway of the cooled room facing outward. The fan will help pull the cool air out of the room and into other areas of the home. The downside to this is that the unit will have to work harder and your energy bills will increase.

Do I need 3 phase supply if I have to buy an AC for my house?
Window ACs and Mini Split ACs work on single phase. However, it is better to have a 3 phase supply and distribute the other loads like Geysers, washing machines, pumps and lights in the other 2 phases.

Which type of air conditioners make the least noise?
Air conditioners have improved over the years and are generally not as noisy as they were a decade ago. But, as a general rule, split air conditioners are quieter than window air conditioners. So, if you are a light sleeper or if noise is a big concern for you, a split AC is your best bet.

What does coolant smell like?
Coolant has a smell that is very difficult to describe; it smells sweet, yet a little like rubber; It has a green color almost like Gatorade. Old coolant can be brown and smell quite rancid.

Does the unit need to be vented out when its in a heat mode ?
Yes it still needs to be vented out if it is in the heat mode as it works exactly how it works in the cool mode. In short when you run it in heat mode, it will blow hot air into the room from the front and the back will be blowing out the cold air through the hose.

What does Inverter Mean?
Inverter technology uses a variable speed compressor motor similar to a car. It simply slows down and speeds up as needed to hold a selected comfort setting.
Inverter technology provides a more precise room temperature without the temperature fluctuations of fixed speed systems.

How do heat pumps work?
1. A brine* circulates in a collector loop and absorbs heat energy from the bedrock, ground, air or water.

2. In a heat exchanger (evaporator) the tepid brine in the collector loop meets refrigerant** circulating in the refrigerant loop. The refrigerant heats up and converts into gas.

3. The pressure of the refrigerant is raised in the compressor, which also raises the temperature to a useable level.

4. Via a condenser, the refrigerant releases the heat to the heating system for the house, and in connection with this the refrigerant is cooled.

5. The refrigerant circulates further. The pressure is lowered in an expansion valve. It reduces the temperature, the refrigerant returns to liquid form. The process restarts when the refrigerant once again meets the brine.

* Brine is a mixture that cannot freeze, for example water together with alcohol or glycol.

** These days environmentally friendly refrigerants such as carbon dioxide and hydro carbons are used. Freon was previously used.

Are Heat Pumps any good for allergy & asthma sufferers?
Yes. Heat pumps have a range of filters that clean and purify the air:
Catechin Filter: Dust, mold spores and micro-organisms are absorbed onto the filter by static electricity and growth is inhibited and deactivated by the polyphenol ingredient extracted from apples.

Ion Deodorizing Filter: The filter deodorizes by powerfully decomposing absorbed odours using the oxidizing and reducing effects of ions generated by the ultrafine particle ceramic.

Plasma Filter: High performance electronic air cleaner removes dust and odour, improving indoor air quality.

Why is a matched system important?
A matched system is important for a variety of reasons. One is comfort. When all our components are properly sized to your home, you can control exactly how much heating or cooling you need so you can relax. Also, a properly sized matched system enables every component to perform as designed, meaning proper cycle times are maintained, humidity is controlled, and system sound is minimized. Another reason matched systems are important is efficiency. Most people buy systems that are too large for their homes, meaning they pay to heat and cool space that isn't even there. A matched system outlined by a dealer who has completed a load calculation for your home provides just the right amount of heating and cooling you need so you get the most value for your utility dollar.

What is the purpose of auxiliary heat?
Under normal operating conditions, the auxiliary heat is brought on automatically by the thermostat when the indoor temperature drops during heat pump operation. There are also times during cold, wet weather when the outdoor coil may ice up and your heat pump will go into a defrost cycle. This is nothing more than reversing the process back to cooling mode. Cooling mode makes the outdoor coil hot and melts any ice. The defrost cycle should only last a few minutes and then return to heating mode. During the defrost cycle, your comfort system is in cooling mode and the supply air is cool. To offset this cool air, the auxiliary heat will be energized during defrost. A mist or fog may be visible from the outdoor unit during defrost.

What kind of maintenance does a ductless heat pump require?
Ductless heat pumps require some basic maintenance to ensure optimum performance. In most cases keeping the filters and coils clean is all that’s needed, and can be performed easily by the homeowner.

What is difference between air conditioning, comfort cooling and close control?
Air conditioning covers many things but is mainly, heating, cooling, ventilation, fresh air, filtration and control of humidity.

Comfort cooling mainly relates to provision of just cooling to improve comfort.

Close control air conditioning is really as the name implies, both temperature, humidity and air cleanliness are closely controlled and often to fine tolerances if necessary.

Tips for Buying a New Room or Addition Air Conditioner
When shopping for an air conditioner, first determine which type of system best suits your needs- central air conditioning or room air conditioning. Central air conditioners are designed to cool an entire house, while room air conditioners are usually window-or wall-mounted units that only cool the immediate area.

Three types of room air conditioners are available: (1) window models that can be installed in most double-hung windows; (2) ductless mini-split systems (3) (PTAC) built-in models that are encased in a sleeve
installed in the wall.

Proper sizing is very important for efficient air conditioning. A bigger unit is not necessarily better because a unit that is too large will not cool an area uniformly. A small unit running for an extended period operates more efficiently and is more effective at dehumidifying than a large unit that cycles on and off too frequently.

When determining the appropriate size air conditioner for your home, consider the dimensions of the area to be cooled. Based on size alone, an air conditioner generally needs 20 Btu for each square foot of living space. Another popular formula is based on 400-500 square feet per ton. Other important factors to consider when selecting an air conditioner are room height, local climate, shading, window size, etc.

Verify that your home's electrical system can meet the unit's power requirements. Room units operate on 115-volt or 230-volt circuits. The standard household receptacle is a connection for a 115-volt branch circuit. Large room units rated at 115 volts may require a dedicated circuit and room units rated at 230 volts may require a special circuit.

If you are mounting your air conditioner near the corner of a room, look for a unit with an airflow in the desired direction for your room layout.

Look for a unit whose filter slides out easily for regular cleaning.

Select a unit with logically arranged controls, a digital readout for the thermostat setting, and a built-in timer.

When considering several comparable units, select the unit with the higher SEER.

What Is a HEPA Filter?
A high efficiency particulate air, or HEPA, filter is a device designed to remove airborne particles from any air that passes through them. They’re the most common type of indoor air filters on the market today, thanks in large part to the fact that they can be up to 99.97% effective at removing particles that measure 0.3 microns or larger.

HEPA filters are usually made of fiberglass fibers that trap airborne particles through interception, impaction or diffusion. This combination of particle trapping techniques is what makes HEPA filters so effective at removing all manner of airborne contaminants.

What is the ideal indoor humidity level?
The American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) recommend a household humidity level between 30 and 60 percent.

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Category: Central Ac System

Query By: MARIO HOWELL (Keysville, VA)

Posted Date: 09/23/2014

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Category: Home Ac Unit

Query By: BETTY T LACURE (Los Angeles, CA)

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