Their current plan is as follows:
Heat- Primary - Margin wood cook stove
Backup - Electric element powered hydronic radiators(size to be determined) that would pull from upper coil in a Wagner 105gal tank.
Hot water - Wood cook stove direct to tank/solar to bottom coil in tank
Backup - Electric element
Ventilation - 2 bathroom exhaust only fans(Whispergreen/Fantech) on Grasslin intermittent timer and a kitchen exhaust with 4 Aldes passive inlet vents and a dedicated stove supply.
We decided not to use the spot ERV's because they operated as "exhaust only" for most of the time when it is cold when they will primarily be used, so the extra cost doesn't seem worth it. This fan might work better in a more temperate climate. It was a tough decision to give up the efficiency of the whole house HRV for the simplicity and economy of the passive vents.
The AC part of HVAC will be passive, using shades and manual operation of windows. The earth coupled basement will also contribute to cooling.
Below is the schematic from Karl Rosengrant, who works with Greenworks Solar. Probably the most interesting part is the controller on the radiant heat dump loop that will supply heat to the bathrooms and kitchen to keep the plumbing warm when the wood stove is out. The controller is connected to the solar controller, which has a read on the temp in the tank. This allows the controller to turn on the heat dump based on both the temp in the bathrooms/kitchen or the temp of the water.
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