First off, I am an HVAC newbie so forgive me if I don't use the correct terminology below. Here we go..
I am having a home built this spring. The home is about 3200 sq ft. 1600 on each floor. Attached floorplans. It will have an electric heat pump with propane backup. I am in southeast PA. I also plan to run a wood burning stove to supplement heat in the winter, although I know this shouldn't affect the HVAC design.
I'm wondering if such a house needs 2 different heating/cooling units (I assume one in basement and one in attic) or does it just need one bigger unit, but with some kind of zone setup where dampers open and close the ductworks based on different thermostats?
My understanding is that the builder will send the houseplans to the HVAC folks (he says he sends them to York) and they will come up with the best HVAC plan. I know they should use a manual J to figure things out, but how do I know that their decision is the right one? i.e. how do I know the builder doesn't say to use just one unit b/c he wants to save money?
So my questions are:
1. For such a home, just looking at the floorplans, does it appear I would need 2 units or just 1 unit with zoning?
2. How does one make sure the builder's decision is the right one? I plan to be in the home for the long haul, and I've heard over and over to make sure they get the HVAC and ducting done right.
Thanks in advance!