Assertion: mixed heating system | /r/ObjectUse | used in individual residential homes
Facets:
value: as backup heat
type: PURPOSE
Source sentences:
text: Mixed heating systems are used both in individual residential homes, often as backup heat or to make use of air ducts and blowers, or they may be used in a large apartment building or office building to permit installation of a large commercial boiler to provide heat to multiple rooms where both heating and cooling will be provided by the same in-room unit.