Heat Loss Calc – GreenBuildingAdvisor

I am doing a DIY house build right now and doing some heat loss calculations. I attempted to use some actual software but there were too many aspects of the software I didn’t understand. I have run the build through two different AI models and they spit out roughly the same numbers but I am curious if someone with real knowledge could gut check this for me. 

House is in central Vermont, Heat loss calcs were done at -10F 

This is an ICF build with extra thick ICF blocks for a true R-30 foam value. Basement and Main floor. Total 16′ ICF height

North East and West Walls are buried to a 11′ height 5′ Exposed. Ie: the first 3′ of the main floor is actually underground The house is more or less an A frame with tall knee walls, from the inside you have a lot more wall (nearly full height) than the outside with the partial burying. South wall is exposed 8′ 

So ICF R-30 to Eave height. 36×25′ Footprint (Exterior)

Cathedral Roof/Ceiling, 14/12 slope, Insulated to ~R-47 

R-20 under 4″ concrete basement slab. 

Gable walls total square footage ~180 sq/ft each 360 sq/ft total at R-30 insulation level

Roughly 75 sq/ft of south wall is glazing European style tilt and turn windows Triple Glazed .54 SHGC and .12 U-Factor

Total Glazing elsewhere 21 sq/ft same specs. 

House will be extremely airtight (near passive house levels) with an HRV system 

Full envelope is heated basement, main floor, lofted cathedral ceiling area. 

I am getting numbers of around 12,000-14,000 BTU/HR at -10F 

I am not asking anyone to run the numbers for me but does this sound reasonably in the ballpark?