1. HVAC/R – Heating, Ventilation, Air Conditioning and Refrigeration – This term describes the entire indoor air quality and environmental comfort. HVAC incorporates the entire system, from the actual heating and air conditioning units to the duct system supplying the air throughout the structure.

2. SEER – Seasonal Energy Efficiency Rating – This term defines the efficiency of the air conditioning unit, much like the “miles per gallon” on your car. The more efficient the unit (the higher the SEER), the less electricity/gas/fuel your HVAC system will use. The less electricity/gas/fuel your system uses, the lower your energy bill. Effective January 26, 2006, national law requires all HVAC systems manufactured to be a minimum of 13 SEER.

3. Zones – Larger spaces tend to have zones to differentiate the various areas being air-conditioned. For example, a house may be zoned by the floors or by various rooms in the house.

4. Thermostat – This equipment controls and regulates the air conditioned space. There are many different models, including type, digital, programmable.

5. Humidistat – This equipment controls and regulates the humidity in the air conditioned space.

6. Filters – There are many different levels of filters. Disposable (or throw away) filters are the least efficient and should be replaced monthly. Electronic filters are more efficient and should be taken out and cleaned quarterly.

7. Central Duct System – Duct distributes air throughout the air conditioned space. There is also a grill for the return air delivery, which is directed back to the air handling system, which when installed correctly, balances the temperature throughout the space for maximum comfort.

8. Refrigerant – Refrigerant, or Freon, interacts chemically inside the entire system. The most common refrigerant is currently R-22; however, beginning in 2010, EPA guidelines have established a reduction in R-22 production to a complete cessation in 2020. The “new” Freon is R-410a, which is more environmentally friendly and is the wave of the future.