On Thursday, August 11, 2016 at 9:14:05 PM UTC-4, Frank wrote:
replying to trader4, Frank wrote:
The only problem is that is that at 45 for a long period of time, the
condensate will build up in the pressure switch tubes and the furnace will
quit working.

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Says who, Mr. Responder to ten year old threads? I've had my furnace
set to 45F while on vacation in the middle of winter, with no problems. Sounds like you have a crap furnace.