During my twenty point heating inspection, I started with the thermostat. Giving a call for heating, and going to furnace to start maintenance. Temp rise of 30-60 needed, I got a temp rise of 52. House heats up to designated temperature. I checked out blower motor of any dirt or debris and it’s clean. Owner will replace his own filter, It was dirty. Hot surface igniter not cracked or having white spots. Flame sensor still working good, no need to be cleaned. Ducting done correctly, and all runs intact. Inducer motor is working efficiently. House heats good and ready for winter.