Originally Posted by travelover
Most of your heat loss will be through the ceiling of the room above. I'd make sure you have all the room air leaks sealed then I'd see if you can improve the insulation in the ceiling of the room over the garage.
Find out where your heat is going and do some calculations to find out what is practical for this particular problem.
The Heating Degree Days for Arlington are about the same as mine, as is the Outside Design Temperature (+14F).
What are the thicknesses of the insulation and the areas of the walls, floor and ceiling?
In addition to normal heating, if one of these 1kw electric portable room heaters can hold the temp. at a desirable level at an average outside temp. then it is making up a loss of 3400 BTU/hr.
If the HDDs for last December for Arlington were 1000, the avg. Dec. temp was +33F.