We had insulation added to our upstairs attic in Fall 2021, and I thought it would be worthwhile to see what kind of difference it made in terms of our heating bill. Previously, the attic had (maybe) R-28 total, and we had 4"-5" of blown-in cellulose added to bring the total up to around R-46 to R-50. Using thermostat data from our ecobee from the previous winter and comparing to this past winter, I can get an idea of how much more efficient heating the house is.
According to This Old House (www.thisoldhou..., adding insulation to the attic, crawlspace, and around basement rim joists can save up to 15% on heating and cooling costs. I investigate how realistic this number is.
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