Pittsburgh has heating and air conditioning supplies and equipment available for sale. Air conditioning, done by HVAC (heating, ventilation, and air conditioning), is essential for contemporary societal comfort. Heating is necessary during the winter months for indoors, both at residential and commercial spaces. Air conditioning is done by using an air conditioning unit, which is a home appliance, system, or mechanism designed to dehumidify and extract heat from an are, using a simple refrigeration cycle. The entire system of heating, ventilation and air conditioning is known as "HVAC". Some of the parts used in such equipment include range hoods, ice makers recovery equipment, contactors, boards, transformers, air conditioner seals, shelves, coils, replacement springs, switches, thermostats, tools, microwave trays, troubleshooting, condensors, airconditioner, rv, motor home, condensers, valves & filters, which are available for sale. A number of different companies manufacture the units and its constituent parts, such as American Standard, Bard, Bryant, Carrier, Coleman, Ducane, Goodman, Payne, York, Janitrol, Comfortmaker, Trane, Rheem, Ruud, Tempstar, Heil, Lennox, Luxaire, Fedders, Aire-Flo, Air Flow, Weatherking, Reznor, Miller, Intertherm, Airease, Heat Pumps etc. One or more of these are available in Pittsburgh.