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What are different kinds of air conditioner systems?
1. Central Air Conditioning System: This unit is used primarily to cool big buildings, houses, offices, entire hotels, factories, etc. The central air conditioning system is comprised of a huge compressor that has the capacity to produce hundreds of tons of air conditioning. If you have a big area to cool, central air conditioning may be the only way to go.

2. Split Air Conditioner: This unit is comprised of two parts: the outdoor, which houses the compressor, condenser and expansion valve; and the indoor, which is comprised of the evaporator coil and cooling fan. The split air conditioner can be used to cool one or two rooms.

3. Packaged Air Conditioner: This type of unit is perfect for cooling multiple rooms or a large space in your home or office. There are two possible arrangements with the package unit. In the first one, all the components, namely the compressor, condenser (which can be air cooled or water cooled), expansion valve and evaporator are housed in a single box. The cooled air is thrown by the high capacity blower, and it flows through the ducts laid through various rooms. In the second arrangement, the compressor and condenser are housed in one casing. The compressed gas passes through individual units, comprised of the expansion valve and cooling coil, located in various rooms.

4. Window Air Conditioner: This type of unit is designed to cool a single room. In this air conditioner all the components, namely the compressor, condenser, expansion valve or coil, evaporator and cooling coil are enclosed in a single box. This unit sits in the window. Because of this, it is not the most aesthetically pleasing option available. But if you are looking to cool a single room, it is the most cost-effective option around.

5. Portable Air Conditioner This system is another flavor of the unitary air conditioning system. The portable air conditioner consists of a mobile self contained air conditioning unit that is placed on the floor inside a room and discharges exhaust heat using a hose vent through an exterior wall. Portable air conditioning units are a bit noisier than other types of units and can typically cool rooms under 500 SF. These units are a solution to those stubborn hot rooms that may exist even with central air conditioning. Like the window air conditioner, the portable unitary system has all the refrigeration components on one compact box. It also ejects heat out one end and blow cooled air out the other end.

What are energy saving air conditioners?
Each air conditioner has an energyefficiency rating that lists how many Btu per hour are removed for each watt of power it draws. For room air conditioners, this efficiency rating is the Energy Efficiency Ratio, or EER. For central air conditioners, it is the Seasonal Energy Efficiency Ratio, or SEER. These ratings are posted on an Energy Guide Label, which must be conspicuously attached to all new air conditioners. Many air conditioner manufacturers are participants in the voluntary EnergyStar® labeling program. EnergyStar-labeled appliances mean that they have high EER and SEER ratings. In general, new air conditioners with higher EERs or SEERs sport higher price tags. However, the higher initial cost of an energy-efficient model will be repaid to you several times during its life span. Your utility company may encourage the purchase of a more efficient air conditioner by rebating some or all of the price difference. Buy the most efficient air conditioner you can afford, especially if you use (or think you will use) an air conditioner frequently and/or if your electricity rates are high.

What are the different terms in air conditioning?
Airflow - The distribution or movement of air.

Air-Conditioning and Refrigeration Institute (ARI)
- ARI is an industry trade association that develops standards for measuring and certifying product performance. For instance, ARI Standard 270 provides guidelines for establishing sound levels for outdoor air-conditioning equipment.

Btu - A British thermal unit is a unit of heat energy. One Btu is the amount of heat required to raise one pound of water by one degree Fahrenheit. The higher the Btu rating, the greater the heating capacity of the system.

CAE - The Combined Annual Efficiency is a measure of the amount of heat produced for every dollar of fuel consumed for both home and water heating.

Carbon Monoxide - An odorless, colorless, tasteless, poisonous and flammable gas that is produced when carbon burns with insufficient air.

Central Air Conditioning System - System in which air is treated at a central location and distributed to and from rooms by one or more fans and a series of ducts.

Compressor
- The part of the outdoor air conditioner or heat pump that compresses and pumps refrigerant to meet household cooling requirements.

Condenser Coil
- The outdoor portion of an air conditioner or heat pump that either releases or collects heat, depending on the time of the year.

Ductwork 
- The method by which air is channeled from the furnace or the blower coil throughout your home.

Electronic Air Cleaner - An electronic device that filters out large particles and bioaerosols in indoor air.

ENERGY STAR® - An EPA (Environmental Protection Agency) designation attached to HVAC products that meet or exceed EPA guidelines for high-efficiency performance above the standard government minimums.

EPA - The Environmental Protection Agency develops and enforces federal environmental regulations. The EPA oversees the nationwide ENERGY STAR® program.

Evaporator Coil - The part of the air conditioner or heat pump that is located inside the air handler or attached to the furnace. Its primary function is to absorb the heat from the air in your house.

Heat Exchanger - Located in the furnace, the heat exchanger transfers heat to the surrounding air, which is then pumped throughout the home.

Heat Pump - A heat pump is an HVAC unit that heats or cools by moving heat. During the winter, a heat pump draws heat from outdoor air and circulates it through your home's air ducts. In the summer, it
reverses the process and removes heat from your house and releases it outdoors.

Horizontal Flow - When an air handler or furnace is positioned on its side and circulates air in one end and out the other. Ideal for attic or crawl space installations.

HSPF - The Heating Seasonal Performance Factor is the heating efficiency rating for heat pumps. The higher the rating, the more efficient the heat pump. HSPF will be regulated in 2006 at 7.7.

Humidifier - An indoor air quality device that introduces moisture to heated air as it passes from the furnace into the ductwork for distribution throughout the home.

HVAC
- Heating, Ventilation and Air Conditioning.

R-22 Refrigerant
- The old standard for residential air conditioners, R-22 refrigerant is now being phased out by the U.S. EPA. Lennox offers dry-charged units for those who still have R-22 compatible systems.

R-410A Refrigerant
- A chlorine-free refrigerant that meets the EPA's newest, most stringent environmental guidelines.

Refrigerant
- A chemical that produces a cooling effect while expanding or vaporizing. Most residential air conditioning units contain the standard R-22 refrigerant, or Freon.

Refrigerant Lines
- Two copper lines that connect the outdoor air conditioner or heat pump to the indoor evaporator coil.

Scroll Compressor
- A specially designed compressor that works in a circular motion, as opposed to up-and-down piston action.

SEER
- The Seasonal Energy Efficiency Ratio is an energy efficiency rating for air conditioners. The higher the SEER, the better the energy performance, the more you save. The DOE's established minimum

SEER
rating for cooling is 13.00.

Thermostat
- Usually found on an inside wall, this device operates as a control to regulate your heating and cooling equipment, allowing you to adjust your home comfort at the touch of a switch.

Ton
- Unit of measurement for determining cooling capacity. One ton equals 12,000 Btuh.

Two-Stage Operation
- Provides two levels of heating or cooling output for greater temperature control, energy efficiency and improved indoor air quality.

Upflow
- When an air handler or furnace is installed in an upright position and circulates air through the side or bottom and out through the top. Typically used in basement, closet and attic

Zoning
- A method of partitioning a home into independently controlled comfort zones for enhanced comfort and efficiency.

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