All my life I have lived in home heated with oil and hot water radiator heat. We recently moved and live in a house that has oil heat and forced hot air. My question is when heat is called for the air is blown out of the vents for very short periods of time, maybe 15-20 seconds) It then shuts off and maybe 20 seconds later it starts again. It repeats this on-off cycle until heat is no longer called for. The time the blower stays on seem to increase slihtly as the number of on-off cycles increase. My question -- Is this normal??? My thermostat has the capability of forcing the blower to stay on for an extra 90 seconds after call for heat ends. Should I use this setting or is what is happening now normal?
Thanks