Most popularly and what pays out the most in rebates with consumers energy would be air sealing and insulating the attic. Typically with cellulose or spray foam. Rim joist seal as well with closed cell spray foam. All depends on size of the home, current insulation, and what issues are causing air leaks. Blanket offers free estimates and energy analysis.
Naturally the cost is based on size of the job. I was satisfied with them
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