During my twenty point heating inspection, I started with the thermostat. Giving a call for heating, and going to furnace to start maintenance. I checked out blower motor of any dirt or debris and it’s clean. Replaced air filter for new air filter. Owner had extra one, so just used his. Hot surface igniter not cracked or having white spots. Flame sensor still working good, deep cleaned flame sensor. Ducting done correctly, and all runs intact. Inducer motor is working high amps. Moved onto the upstairs unit, I shut off downstairs after I was done with my inspection. Put system in a call for heating mode. Soon as the house warmed up after thirty minutes. I checked out blower motor of any dirt or debris. It’s clean, well maintained system. Replaced air filter for new one. No gas leaks in system, everything pipe doped. Hot surface igniter not cracked or having white spots. Flame sensor still working good, Deep cleaned flame sensor. Ducting done correctly, and all runs intact. Induce