RICHLAND, Wash. — Packaged air conditioners and heat pumps serve over 60 percent of the commercial building floor space in the nation, contributing to about 230 trillion Btu of energy consumption ...
If you are primarily a residential technician working on equipment under 5 tons, there is a lot of similarities between the systems you are used to and 5 – 20 ton rooftop units that are common to the ...
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