I've just poured the foundations on a self-designed 1344 sq.ft. 2 story home 150 miles north of Toronto, Ontario. R50+ walls, ground floor is slab on grade with R15 (Soya foam) beneath, 1st floor is R60+, unused attic is R60+, both BIBS (blown-in fiberglass). 10% window openings, all south or east facing. The upper floor is the main living space; the ground floor will hardly be used. No gas available, so source must be propane, oil, wood, or electricity. My walls will be 12" thick (two 2x4 walls 12" outside to outside), my floor is 16" deep joists, and there's tons of room in the truss (20" knee).
I had been considering electric radiant throughout as my current home (also self-designed and built in 2001) uses hydronic radiant. I like the comfort factor of radiant (constant even temp, no unnecessary air movement, quiet.) The new house lacks the thermal mass (I believe) to support hydronic, and I felt that putting a slab on the upper floor would require an engineered floor (which I didn't have the time or money to get designed.)
Meanwhile the quote on electric radiant has come in at over C$$$$&&
So I am now open to any form of system to do heating and A/C. I intended to get a Venmar AVS EKO 1.5 HRV, but if that can be avoided with the HVAC, great.