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 40-70 needed, I got a temp rise of 49. House heats up to designated temperature. I checked out blower motor of any dirt or debris and it’s clean. 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 using high amps. Whole furnace being ran is using max amps. System is 20+ years old. Blower motor wheel, is rusting out. Needs replacement to wheel.