I am slowly working at maki g this house more efficient. Most recently I gutted the wall between the kitchen and back porch, spray foamed some 1" r5 foam between the studs to act as a vapour barrier and will fill the rest of the cavity with fiberglass.OUCH!
I heat & cook w/wood & propane, propane wh, average bill is $35 p/mo.
It gets cold in the Sierra Nevada's, but nothing like Canada. Did my house to Manual J standards with a ERV