The assemblies are typical of the 80's with the north / south walls being 2x4 + bat fiberglass insulation and a 1ft minimal air gap, up to 9ft in one section on the south wall.
The east / west walls are 2x6, bat insulated. Ceiling is an odd combination of truss, bat insulation, air gap, then more bat insulation, then open space.
Basement throughout with 30ft 8" air tube in basement only opened during hotter times of year.
I have tried to model the home several different ways so far with a goal of ~20 kBtu / sqft yr as teased out of electric bills the individual provided.
The following are all Summer models with shading from trees included, the energy demand is close enough to warrant the quick comparison before moving forward.
- Two simulated zones (thermal buffer zone and interior living space) including the basement (256 kBtu / sqft yr)
- Same as case 1 excluding the basement. (165 kBtu / sqft yr)
- Copies Case 2, Zone with the thermal buffer zone (TBZ) set to attached unheated space. Zone 1 internal living space assemblies all have inner wall + air gap + exterior wall. (80 kBtu / sqft yr)
- Copies Case 3, sets TBZ to unheated cellar (77 kBtu / sqft yr)
- Copies case 4, sets TBZ to wintergarden with .1 heat transfer [for extremes to see what happens] (64 kBtu / sqft yr)
