My mom paid to re-insulate her attic a few years ago. I think she paid $3,000 (in a rural area), but says it's dropped the temperature in her house by 10F, and

My mom paid to re-insulate her attic a few years ago. I think she paid $3,000 (in a rural area), but says it's dropped the temperature in her house by 10F, and when I've visited in the summer I've noticed. It's a remarkable win.