Last summer I asked an HVAC technician to come out and check on my AC. My house was built in 2005, so the AC is around five years old, and runs pretty much constantly throughout the day on hot days (90+ degrees in northern Alabama). He peeked into the attic and said my return air ducts were too small and quoted me a price on replacing the return ducts and filter box with larger ones. Before I spend the money (because it is quite a lot), I'd like to know if I really do need larger ducts and a larger air filter box. Could some kind soul please offer their opinion?
I have a 2000 sq ft house, single floor with a bonus room above the garage (the bonus room is about 220 sq ft of the 2000).
I have a 3.5 ton unit, which is serviced by two return vents: a 20" x 30" filter box into a 16" flexible duct (~30 ft long) and a 12" x 12" filter into a 10" flexible duct (~5 ft long). Is this sufficient?
Here are the unit models:
outside: Goodman CPLE42-1C
attic a/c: Goodman CHPF042B2C
attic furnace: Goodman GMS80904BNA
If you need any other information, I can try to get it!