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 (https://www.thisoldhouse.com/insulati..., 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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