How long should a furnace stay off between cycles?
How long should a furnace stay off between cycles? With all that being said, if there are no extreme factors involved, the average run time for a furnace is 10-15 minutes per cycle. Your furnace may need to run two to three times an hour to maintain your desired temperature if your home has average insulation. Is it safe to leave furnace on when not home? Heat constantly escapes your home when it's cold outdoors, which is why it makes sense to lower the thermostat when you're not there. But turning off the furnace in the winter—especially when you're away...