Being in operation since 1939, Merz Heating & Air Conditioning Inc. is a residential and commercial heating, ventilating, and air conditioning (HVAC) contractor serving throughout central and southern Illinois. It provides a complete line of commercial services, such as air pollution work, insulated systems, stack work, industrial heat and air conditioning, blowpipe and dust collection, heat recovery and much more. Merz Heating & Air Conditioning Inc. provides various residential services, including heating, air conditioning, geothermal, air duct cleaning, etc.. Air Beds