Single pane windows...build storm windows for those months you don't open your windows. I built mine out of plexiglass mounted to the back of wooden frames. They help with drafts, infiltration and sound of neighbor's dogs too. I'd put some solar screens on your windows to, solar screen is cheap and easy. Windy winter days are good for finding air leaks around your house. check around plumbing penetrations, outlets, doors, window casing, baseboards etc. You'll be surprised where everything leaks.
If you have a gas furnace in an interior closet make sure its sealed and has a combustion fresh air intake from outside. Otherwise as your furnace burns it uses conditioned air while your house sucks in cold air from outside.
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1.47 kw solar, R-40+ attic insulation, 4 layers radiant barrier, solar attic fan, solar mini pool pump
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