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I just installed a new high efficiency natural gas furnace, a Weatherking 75,000 BTU, my home is a 1,248 ft sq rambker with full unfinished basement. The old original was still working. a Brentwood 125,000 BTU 35 years old when on would run a long time and even get the floor registers so hot you could hardly touch em. My new furnace is constantly kicking on and off runs about 7 min then off for 5 min, when I check the air flow it`s not hot barely warm, it` not even cold yet what`s going to happen when it gets - 40
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