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Furnace
A furnace is a heating appliance that burns fuel or uses electricity to heat air, which is then distributed through ducts.
Why it matters
Furnaces are a primary heat source in many homes. Efficiency, sizing, and maintenance all affect comfort and energy costs.
Where people get this wrong
A furnace heats air. A boiler heats water. Furnace efficiency is rated by AFUE. Higher is better, but duct losses can matter more than furnace efficiency.
Real-world example
The furnace is 25 years old and the blower runs constantly. A newer high-efficiency furnace could save money and improve comfort.
Where this hits your build
This affects daily comfort in every room. Problems often show up after move-in when certain rooms run hot, cold, or noisy.
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