If you have an older home built before the 1970’s chances of your walls having no Insulation is very likely. The space between your exterior walls and studs probably has nothing but air inside. That is the same air you try to avoid in our freezing winters and hot summers.
Adding wall insulation is a great path to a comfy home. Walls and attics account for 80% of heat loss in the average home. Filling them with proper insulation and installation procedures will benefit your home. Keeping it toasty warm in the winter and cool in the summer.