Dr-Fix-It! HVAC General Commercial Air Conditioning Systems. Commercial Systems and Service of heating, ventilating and air conditioning equipment principally for the commercial, industrial and institutional markets.

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Carrier Commercial Welcome to Commercial Systems and Services. This site is designed for HVAC professionals like yourselves: engineers, specifiers, building owners, contractors, and facility professionals.

Comparing Energy Efficiency  Free On-Line analysis instantly compares the energy efficiency of different brands of heating and cooling equipment by means of standardized rating systems: AFUE (gas heating) SEER (cooling) HSPF (heat pump heating).

McQuay Commercial McQuay International is a world leader in the manufacture, sales and service of heating, ventilating and air conditioning equipment principally for the commercial, industrial and institutional markets.

Trane Commercial Our goal is to help improve your productivity and competitive edge by helping you get the greatest value from your parts purchase.

York Commercial YORK International is the largest independent supplier of heating, ventilating, air conditioning and refrigeration (HVAC&R) equipment in the United States and a leading competitor in the industry internationally.

www.ari.org  Air Conditioning and Refrigeration Institute

www.ashrae.org American Society of Heating, Refrigeration & Air Conditioning Engineers