Garage Door: The 'Fifth Wall' Insulation
Impact
Medium
Difficulty
Easy
Speed
Instant
If you have an attached garage, it's a massive source of heat transfer. Most garage doors are just thin sheets of metal that offer zero insulation. They're essentially a giant 'thermal bridge' between your home and the outside world.
Insulating your garage door—either by buying an insulated model or using a DIY foam-panel kit—can raise the temperature in the garage by 10-20 degrees in the winter. This means the wall between your garage and your house doesn't have nearly as much work to do. It also protects your water heater, laundry appliances, and car from extreme temperatures, making them last longer and run more efficiently.
It's an easy DIY project that usually involves specialized foam panels that snap into the door's channels. It also has the added benefit of making the garage significantly quieter by dampening the sound of the door motor and the outside world. It turns your garage from a 'cold cave' into a comfortable workshop and a solid thermal buffer for your home. Seal the fifth wall and stay warmer!