Don Vandervort, Head Homeboy, has written more than 30 DIY home improvement books, been a segment host on HGTV, served as MSN.com's home improvement expert and written countless magazine articles.
If your furnace cycles off and on too frequently, the problem is likely to be with the thermostat—especially with a combustion furnace. See "Thermostats" for information on repairing this problem.
When an electric-resistance furnace or heat pump turns off and on too frequently, the problem may be that the unit is overheating because of a clogged filter or blower that is malfunctioning. Try cleaning or replacing the filter. If that doesn't do the trick, call a furnace repair technician.
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