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 ...
The Infinity® 98 gas furnace line with Greenspeed intelligence operates at a gentle, low capacity up to 90 percent of the time. When combined with an Infinity control, the modulating gas valve in the ...
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