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An air conditioning, heating and refrigeration (AHR) technician is trained to design, install and service air conditioning, heating and refrigeration equipment in residential and light commercial ...

Willis Haviland Carrier designed and launched the first-ever air conditioning system in July 1902. For its time, it was an absolutely revolutionary innovation in technology that fundamentally ...

REFRIGERANT SWITCH: A Greenheck DGX-P116 Makeup Air Unit. Greenheck Fan Corp. has begun offering direct gas-fired makeup air units with the lower-GWP refrigerant R-454B. (Courtesy of Greenheck Fan ...