It may seem like extra work, but taking the time to remove the A/C unit from your window prevents cold air from sneaking through cracks. If you can't manage to remove it, invest in a heavy tarp to cover the unit during the winter.
Related: Bob Vila's 10 "Must Do" Projects for December
Honeywell RTH2300B1012/E1 ... $17.78
Stansport #T-810 Reinforce... $5.21
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