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6 天
How a heat pump furnace combo provides year-round comfort
Heat pump furnace combos, commonly known as dual-fuel or hybrid systems, consist of an electric heat pump and a furnace ...
waketech
3 年
AHR-140: All-Weather Systems
This course covers the principles of combination heating and cooling systems, including gas-electric, all-electric and oil-electric systems. Topics include PTACs and package and split-system units.
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