Why do air-source heat pumps usually require auxiliary heat?
A) The heat that a heat pump "pumps in" must first be provided by an auxiliary heat source
B) Because air-source heat pumps break down a lot
C) The heat pump compressor will not start in cold weather unless it is first warmed up
D) Because the heating capacity of the unit drops as house heating requirements increase
D
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A. cutting B. tapping C. reaming D. drilling
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A. dry-bulb B. hydrophobic C. wet-bulb D. hydrothermal
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