Over the summer I had a company install a 95% efficient furnace (Goodman brand) and this unit runs like for 20 minutes all the time even after reaching the desire room temperature. My previous furnace would turn off as soon as it reach the desire temperature, just wondering if this how efficient furnace work? For example if I set the temp to 72, after it finishes running the thermostat says 74 or 75, I have compared with another thermometer and they both show the same temp. I guess for the temperature reaching so high it takes a while to turn back on, last time I jotted the time and it took 4 hours to turn back on.