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Thanks everyone for the advice. I looked over ASHRAE 17/18 and ASHRAE 90.1, but again, even in the worst case scenarios, this only shows bridging effects to the tune of 10% or so from say R30 insulation to R25 overall. Same thing with whether it 12 vs 16 people, vs 8 TVs or 10. Minor points that...

The floor space of 2100 sq ft is the portion directly in contact with the ground for purposes of heat loss through that mechanism. Total living space will be on the order of 4 x 2100 + 1064 on top of the existing or roughly 9500 sq ft of new living space. Hence 20 tons, which seems overkill...

Thanks for the feedback. We are planning on mechanical ventilation, 8 x HRVs at 65 cfm which is that other 50k BTU/hr I accounted for, even though supposedly up to 80% of the heat will be recovered. What sort of thermal bridges are going to be present in ICF construction? the Plastic webs...

Recently started a new job as an assistant project manager bit of a career change so no real experience in construction. Owner/lead engineer is putting an 8 unit addition onto one of his houses, and typically hires out to get designs stamped by engs who specialize in whatever, but is having me...

I'm an engineer who started a new job assisting with project management and the like, and one of the things was the check the sprinkler design that was proposed for one of our buildings, not sign off, but just to get an understanding. It doesn't need sprinkler yet, but more levels may come, so...