Heat performance tuneup times two systems. Client changes his own filter. Spec blower, evaporators and ductwork. Tested all safety features Hollyn mitten rollouts. Tightened all wire connections. Both units have faulty inducer motors. when second stage is engaged the bearings are making noise. Office will check the price and availability for the part. The upstairs unit is utilizing a 14 x 25 by one filter. This is a 100,000 BTU furnace. Recommendation is a 20 x 25 x 4“ filter rack. Cost is $495. And I told Alan we will email him prices for new furnaces in case we can’t find the part. No carbon monoxide or gas leaks detected in the home.