I've got an HVAC decision to make for a basement addition I've recently started but it seems that each HVAC contractor has a different opinion of what I need. I'm hoping that you folks can help me zero in on something that will work.
The completed basement will be about 950 sq'. My initial thought was have a 1.5 ton heat pump installed and move on to the drywall. Some contractors priced that very job but others said that I won't be happy with a solo heat pump for down stairs (one even refused to bid that set up). They claim that the basement cooling demands are minimal which translates to few and short run times for AC. That in turn translates to humidity problems (I have a dehumidifier but would prefer to run it only occasionally) and various other problems. These guys recommend a zoned system. They claim that with a zoned system, a 2 stage compressor, and a variable speed dual fuel air handler, I'd be much more comfortable AND would find it cheaper to run than the new heat pump + the system I currently have.
I've never heard of a zoned system and can't seem to find much info on them. I'm hoping you folks have some opinions about which way to go.
Additional info - the current HVAC for up stairs is 15 yrs old. The basement is fully insulated (r13 min) and is a walk out type with 2 big windows and 2 doors. I live in TN very warm wet summers, mild winters with some really cold spells. Most contractors bidding the job measured the space/windows/doors and etc. which I assume is for manual J calcs (though I've not seen any ciphering).