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 RTH221B1021/A 1 ... $14.28
Grizzly Tarps 8 x 10 Feet ... $4.60
DAP INC 18152 10.1oz White... $2.75
7876400 Alloy 42-Inch Gun ... $61.25
Zodiac 9-100-1014 All Purp... $24.88
J5 Tactical V1-Pro Flashli... $9.55
BLACK+DECKER LDX120C 20-Vo... $59.99
Custom Leathercraft 125M H... $9.27
Snow Joe AZ-25-EB Melt-2-G... $15.99
BLACK+DECKER LCS1020 20V M... $102.72
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