Air Conditioning, Heating & Refrigeration Institute
American Society of Heating, Refrigerating & Air-Conditioning Engineers
Sheet Metal Workers International Association Local Union 66
Sheet Metal & Air Conditioning Contractors' National Association Western Washington
Washington State Department of Labor & Industries
Western Washington Sheet Metal Joint Apprenticeship Training Center

Common Heating & Cooling System Components

Air Conditioner — Also known as a condenser, this exterior unit is paired with a coil (also known as an evaporator) to comprise the system that cools the air in your building.
Furnace — This interior unit heats and circulates air throughout a structure's ducts.
Thermostat — This is the temperature control center of your heating and cooling system.

Components That Improve Indoor Air Quality

Germicidal UV Light — Uses UV technology to continuously sterilize and purify the indoor air you breathe and significantly reduce environmental stressors on your immune system.
Central Humidifier — Maintains the proper level of moisture in your building, which reduces static electricity and helps you feel warmer in winter and more comfortable year round.
Energy Recovery Ventilator — An indoor air quality component that brings fresh outside air into your space while expelling stale air.
Electronic Air Cleaner — Additional filtration intended to reduce airborne allergens, providing better air to breathe.