Assertion: heat pump | /r/HasProperty | heat pumps
Facets:
Source sentences:
text: A heat pump is usually powered by electricity, although there are heat pumps that run on natural gas, propane, or even solar or geothermal heated water but those are not found in residential use.
text: Most heat pumps work poorly below 50 degrees, but there are heat pumps now that use a hybridized approach which perform much more effectively.