Yep. My house was built in the 60s and no insulation in the walls or in the floor space between the garage and bedrooms over top. Next to no insulation in the attic.

I recently had the garage area and attic insulated to the proper R rating for my area and have been astonished at how much warmer the house is and how much longer it maintains those temps.

Well worth the price and I should have had it done years ago.