Good evening folks,
The new house I am building has been selected to participate in a zero-net-energy type contest. Awards will be based on the lowest as-built HERS index from the REM/Rate program.
Notwithstanding the prize money I'm looking to build the most efficient house that I can, with some reasonable cost constraints. So, given:
- an 1152 s.f. single story house.
- 7500 d.d. New England climate.
- superinsulated (R-40 walls, R-60 roof, R-30 slab on grade, high effficiency windows).
- very tight envelope construction, (<.35 ach).
- solar tempering on conc slab for thermal mass.
- design heat load of 8,400 Btu/hr at -10 deg. f.
What is the most efficient way to heat & ventilate my house?
What system will get me the lowest REM/RAte HERS index??
All your creative ideas and technical explanations are welcome and sought after.
Some possibilities I have explored:
1) Whole house ducted HRV with 2000 watt in-line electric heating element between the HRV and fresh air supplied to the house.
2) Whole house ducted HRV with single direct vented sealed combustion gas furnace (Rinnai 263 or similar)
3) Whole house ducted HRV with a Mitsubishi Mr. Slim heat pump. (Would I still need an electric or gas backup heat with this?)
4) Forget the HRV (and the electricity cost of the continuous fan) , install the absolutely smallest wood stove I can find (Jotul 602, 28,000 Btu/hr max output) and put "smart hole" vents in each of the bedrooms for fresh air. Exhaust moisture from the bathroom and stove with directly vented fans.
Please let me know what you think.
Boatloads of good karma flow to the best solution!!!!