The Evolution® 987M is a fully modulating gas furnace with load matching performance that delivers up to 98.3 percent AFUE. A modulating gas valve is capable of adjusting from 40 to 100 percent of ...
Most of us grew up with what seemed like a scary furnace that lived in the basement. It made creepy noises when it started up, and usually overheated the house before it finally shut off. And forget ...
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