Home energy analysis software

Natural Resources Canada uses the following program to calculate rebates for energy efficient home upgrades.
Download from: http://www.buildingsgroup.nrcan.gc.ca/software/hot2xp_e.html
According to the technical report from this software, a one-story house with a full basement 43' x 43' exterior dimensions with a floor area of 1500sqft on the main + another 1500sqft in the bsmt results in the following heat loss values at 19F on the north west coast.
Base values: =========Orientation: west Window distribution: even, 15%, metal, single Cathedral roof: R12 attic Main floor walls: R12 on 2x4 wood Basement walls: no insulation, mostly below grade ACH @50kpa: 10.35 (ACH = air changes/hour)
Heat loss = 57k (seems low to me as most HVAC contractor recommend 80k or more)
Upgrades: (cummulative):
HL 49k; Low-e, double pane, vinyl windows 37k; Add R20 to bsmt walls 32k; Upgrade attic to R40 28k; Reduce ACH to 4.5
It gets even better, annual fuel consumption is reduced from 215 million btu to a mere 81, almost 2/3's. Can anyone here verify these calculations empirical evidence?
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Wow. Does the house implode? 50kPa is 1044 pounds per square foot :-)
Nick
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"Wow. Does the house implode? 50kPa is 1044 pounds per square foot :-)"
Only if it's absolutely tight, of course. I just had this test done and my place was rated as very air tight but when the blower went on, the draft in places could part your hair!

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They only test to 50 Pa, not 50 kPa.
That's about 0.5 ACH of natural air leakage, an airtight house, by US standards, but a poor submarine :-)
Nick
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