Looking for suggestions.
My daughter & son-in-law just bought his grandmother's 20 year old house. It has a Fedders rooftop a/c unit that also has a gas pipe connected to it. They tell me grandma had it "completely" rebuilt a few years ago. It runs, but it still does a poor job of both heating and cooling.
Today I plan to climb up on the roof and into the attic looking for problems. I'll be looking for dirty air filters and leaking air ducts.
What else should I consider?
Would they be better off to replace it with a ground mounted condenser than to keep throwing money at this rooftop unit?