Caulking, thick sticky insulation along the cracks like you can use on doors. I've seen some even use thin plexiglas over the worst windows on the outside and drill them on the frame. Then remove them when the temps rise.
You can also use insulation on each of your outlets, even the ones that are on inside walls. They are foam pieces that fit behind your outlets. Just remove the outlet plates, place the foam pieces in and replace the outlet covers.
Also, put snug fitting child proof covers on all unused outlets. You'd be surprised how much air comes through those outlets.
Keep the heat turned down a notch or two and use a space heater in the main room you're using, on low. Use small space heaters in each bedroom on low at night and turn the heat down.
Use blinds and/or lined drapes on windows to keep the drafts down. These help in summer too to keep the heat out.
Insulate your doors as well.
Use rugs where you can to avoid chilly floors.
Put socks on the kids feet at night. Try using sweat shirts/pants as pajama tops/bottoms, especially if the kids kick their blankets off during the night.
Go online and research tips on saving energy and keeping the home warmer.
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