I live in Pawling NY and just bought a modular home 4200ft (1400 1st + 1400 2nd + 1400 basement). Currently has no duct work and oil heat.
It is my intention to design 2x heat pump systems. One for the top floor (1 zone) and 1 for basement and main floor (2 zone). I have been in service for 5 years but this is my first design from scratch so cut me a little slack. I used loadcalc on my tablet and calculated the building envelope and the room by room.
Please check my assumptions:
1) System should be sized based on heating need.
2) 2 Stage units would be better to compensate for the large difference between heating and cooling needs.
3) Basement will be ceiling supply and return, 1st floor will be floor supply central return, 2nd floor will be ceiling supply/ central return... this is the most economical for installation time... should be ok, right?
4) The backup heat will be the oil hot water baseboard (how will this work?? will the unit reach max capacity and not be able to keep up so it will call for supplemental heat or does the unit lockout at a certain temperature and the backup heat is on 100% of the time during the bitter days(sorry most of my experience is refrigeration)?
Thanks in advance for the feedback.