If you aren't someone who isn't planning to convert your garage into another room, installing insulation if you don't already have it is always a really good idea. This will go a long way to making sure you don't need to turn your heaters up so high to keep you warm.u003cbr/u003eAs mentioned above, make sure to check for any drafty spots where the cold winter air can blow in and take care of them. This is common up above the rafters, the seams of any windows or exterior doors, or even the garage door itself. Many garage doors have a gap underneath it where cold air can blow in and heat can escape. Consider attaching a rubber strip to help protect from this. Just make sure that if you are working with anything toxic, you get proper ventilation or crack windows and doors to ensure breathable air.