I need some advice...preferably before I cut a bunch of holes in the walls or ceiling and find out that this was a pointless venture.
So the details:
900sq foot one level, mostly open plan, highly insulated and sealed home.
Heating climate...like really... a lot. -40 C is not unheard of for stretches of time. More typical is -20 C
The house is powered completely with PV.
Heat is supplied by radiant slab, a bit of passive solar. I am also putting in a small wood stove in the next few days.