>>1647004Weatherizing and extra insulation can help a great deal. That means caulking and using expanding foam insulation to seal literally all gaps everywhere (around pipe, base boards, window trim boards, fixtures, electrical boxes, etc.) In winter, on windows you'll not be opening, using heat shrink Duck brand clear window plastic can be amazing for extra heat retention. Then do a blower door test. You'd be amazed by how many houses will have cold air coming through the electrical outlet holes when the wind blows against the outside of the building on that side. Placing draft blockers (aka "draft dogs" like in pic) at the bottom of all doors also helps a ton, even if their weather stripping works well, and are easy to DIY out of old jeans. Using foam panels over the windows at night is a big plus.
I spent like $200 on sealants and it lowered heating costs down to 1/32th what they were originally.
