Have a Rheem 90 Plus Gas furnace with air "piggy back" (don't know correct term). The unit is 9 years old. Had fall service check 3 weeks ago (no problems), turned on today for the first time this season, and NO HEAT. Flow chart in the manual says it's either the pressure switch, motor wiring or IDM motor.
We're very frustrated with this unit, particularly the AC. We're now on the 4th indoor coil. Also had gas valve replaced three years ago.
What is the average life of a gas unit with AC? Should we move forward with repair or get quotes for new? Time is of the essence, highs in the 50's, lows in the 30's here in PA.
Any feedback on repairing or replacing this unit is greatly appreciated.