You're right, most of the homes I do are more like 3,000 sq ft plus a finished basement, but still two systems are a good way to go. I don't argue that a single system will do the home that we are speaking of. However the installing company needs to be proficient at air distribution design and implementaton to make it function properly. Not tooting my own horn but besides myself, there is one other company in my area that has a competent design and installation team. Most of the companies around my area are "rule of thumb" guys.
Originally posted by arc8
option of buying two HVAC units for the home versus the standard one system.
The house will be approximately 3,00o square feet including the basement.
There is a two story foyer so lots of interconnected space between first and second floor.
If no more than a 5-ton system is sufficient for the house, then there's nothing the matter with a single system.
3,000 square ft with a basement is not big!
Is this a split foyer or a tri-level house?