I have done the garage attic area and it’s definitely not worth the money. Insulating the door is a good idea. As for blowing insulation through out the house attic the probably I see is you have no idea if it is being done properly or even completely. They usually send out young kids to do the work. Do not due it in the hot months! Some people have put radiant barrier on the rafters and that will help a lot but it is very expensive! Worth it? Maybe over a long period of time.
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