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Published on Dec 19, 2011
This is my grandparents' 1996 Lennox Whisper Heat 100,000 BTU gas furnace starting up in HEAT mode. It is tied into a 1988 3.5-Ton Kenmore (ICP) air conditioner. The house is about 2,000 square feet, so this is a little oversized. It should have a 90,000 BTU furnace.