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<<Hotfoot - I have a thermostat with a heat anticipator, and I also have been annoyed by the very short heat cycles ... so I printed off the instruction manual from the web and realized that I could adjust the heat anticipator. I set mine near 0.6 and so far it's OK I think ...the furnace stays off for much longer now. I will continue to monitor this and set it at a level that I'm happy with. I'd rather my house temp swings 1 degree F or 1.5 degree F and have longer on/off cycle times than the annoyance of hearing the furnace kickin all the time.

Well, good for reading the manual, but there are other possible causes of problems like this as well, and doctoring up a heat anticipator might disguise such problems for a while. Improperly sized ductwork, plugged filters, improper fan speed, improperly set fan on/off timer, improperly set high temperature limit switch and so on.

Have you had your furnace inspected and maintained recently? If not, this might be a good time to do so. Doctoring up one problem you notice while having three other problems you don't recognize get worse is one of the weaknesses of DIY repair work.

Seattle Pioneer
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