Before spending money on this project, google "aluminium foil in attic" and read through some of the results. I don't know what they are charging but if you really wanted it done I'll bet a handyman could do the same job for a lot less.
On one site I found was a man asking about a offer to do the job for $1.50 a square foot. A 1500 sq ft home will have a roof sq footage of roughly 2000 sq ft $1.50 times 2000 = $3000
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