Hi. I've been reading all over this site trying to get some questions answered, so I apologize if you've answered these kinds of questions a zillion times and I missed them.
Basically, I have a 1720 sq. ft, 2 story house that has almost 100% sun exposure on the south side, 0% on the north side. There are six people and two cats who live here. I'm replacing a gas/electric, heating/cooling outdoor unit that exploded the other night.
I've had two guys out. One recommends a 3.5 ton system and one recommends a 3 ton system. I'm looking at American Standard YCY and YCZ models. I currently have a 3 ton system that was installed in 1991. It seemed to do fine with the heating and cooling before exploding. But, the upstairs was always warmer in the summer.
I also had one of the guys say I needed to increase my return duct size. I have two currently. Both are 10". He recommended changing the downstairs one (too much trouble to do the upstairs one) to a 14" return.
I've been reading a lot about Manual J and Manual D and am quite overwhelmed by all of it.
If either one did any type of calculation, they certainly didn't share it with me.
I guess I just want to know if any of this sounds outrageous, right on the mark, or if it's just going to be one of those, "You'll just have to do the best you can" types of things.
Thanks for your time.