The problem: Replacing an existing gas furnace with a new, more efficient furnace. The apprentice: Allen Charles Edwards (ACE) — First-year mechanic. The technician: N. Arthur Thomas Egan (NATE) — ...
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5 Types of Furnaces and How to Identify Them

Gas furnaces generate heat by burning natural gas. They’re available in varying sizes and energy efficiencies and produce a ...
We had a new high efficiency gas furnace installed in our house about a year ago. The contractor informed us that the new “code” required that the furnace be vented out the side of the house instead ...