Do you also have a warm-air furnace
, which is inefficient or unsafe to use -- and what is the fuel used?
278,000 had a warm-air furnace
and 183,000 had a heat pump as the primary heating system.
have central heating, and six-out-of-10 have a warm-air furnace
For warm-air furnace
systems, check and replace dirty air filters.
have central heating, and nearly six-out-of-10 are equipped with a warm-air furnace
Additionally, most units (89 percent) used a warm-air furnace
Additionally, most units (60 percent) used warm-air furnace
have central heating, and six-out-of-10 are equipped with a warm-air furnace
About two-thirds (64 percent) of the units used a warm-air furnace
for heating; 12 percent used an electric heat pump; and 11 percent used a steam or hot water system.
The manufacture of air conditioning and refrigeration equipment and of warm-air furnaces involves the production of heat transfer apparatus for residential, commercial, and industrial applications, as well as for hospitals, marine vessels, freight and passenger vehicles, and many specialized applications.
thus, the production of heat transfer equipment other than unitary or room air conditioners or warm-air furnaces increased at a rate nearly 10 times higher over the 1967-73 period than during the 1973-82 span.
Periodically clean or replace filters in warm-air furnaces