Adding Attic Insulation is easy with CertainTeed TrueComfort™. The TrueComfort system comprises fiber glass blown-in insulation and the blowing machine used to install it. The machine is portable and simple to operate, and the insulation is super-expanding, requiring fewer bags than other competitive products to achieve the same R-Value. Professionals can rent the machine and retrofit attics saving homeowners up to 20% on energy costs