Physics, 24.12.2019 17:31 meje1301

All of the following are examples of ways to improve energy efficiency of heating systems, except

a. closing off rooms that aren’t in use.
b. frequently cleaning the furnace filter.
c. fixing cracks in the walls and floor.
d. opening the front door in winter to filter and clean warm air.

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All of the following are examples of ways to improve energy efficiency of heating systems, except

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