EcoRenovator - Cold weather living

I live on a acreage near Edmonton, Alberta. The house is not an efficient design but does score well on the blower door test. Last year Edmonton had 5100 heating degree days. It can go to where Celsius and Fahrenheit meet (-40)

Right now I am building a 400 square foot outbuilding. The building will be used to do stained glass. The walls, ceiling and floor are 6" foam. We did install 50 square feet of double pain vinyl windows and a insulated steel entry door.

The building is heated with Electricity via baseboard heaters. Electricity is expensive here so we really focused on the insulation and controlling air infiltration. We did a good job of sealing things up and before we connected the baseboard heaters we could keep the building comfortable with a small ceramic cube heater. I had calculated the worst case senario for heat and I knew we could need 4000 watts on the coldest day. We beat that.

When the building is unoccupied we will turn the heat down and insert insulated window panels to keep the heat in.

Right now I am investigating building a heat exchanger. the stale air intake will be connected to a range hood that will be used when soldering the glass. It will also be used to remove stale air as the building is so tight that the air is likely not to healthy.

I am still contemplating if I will add a fan to the exchanger but I think that due to the small space and tight construction it will not be needed. I do know how to test of negative pressure.