[Greenbuilding] Passive solar heat loss calculations

[Stewart Abbey]

I have just done Kachadorian's heatloss calculations for the house I am about to build. I would appreciate some opinions.
Here are the numbers.

Location: near Montreal lat 47oN.
Basement: 1000sqft south and west walls above grade 
Main floor 1300sq ft.

Exterior walls (above grade)        1888sqft x.04 (R25)=75BTU's/hr.ft2.oF
Ceiling                                      1400sqft x.03 (R40)=42BTU's/hr.ft2.oF
Infiltration                                           20912sqftx.018Btu's/ft3.ofx.67ACH=252Btu's/hr.oF            ??? What is reasonable air change per hour in a well sealed new house.
Glass                                       302sqft x.2= 60 Btu's/hr.oF
Below grade walls                     622sqftx.05(R20)=31Btu's/hr.oF
What ground temp should we use for below grade walls? I used 45oF, I think
35oF makes more sense.

Total heat loss               429Btu's/hr.oF x24hr/day=10296Btu's/oF.day

south windows 190sqft
west windows 100sqft (Shaded in summer,best view)
east windows 0     (garage)
north windows 12sqft

After doing the calculations I get 94 million Btu's/yr using Ottawa's degree days
(Closest to homes location)    Seems too high.
Heat loss of 35253btu's per hour to -10oF
Solar heat gain of 25 million Btu's/yr
Do these numbers make sense? 2/3 air changes /hr is clearly the biggest heat loss. I this number reasonable?
Backup is radiant floors with wood boiler and EPA wood stove.
Thanks for your input
Stewart

       
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