There are likely code requirements in most colder regions for minimum R-values for ceiling and wall insulation. Of course code isn't retroactive, so there are s

There are likely code requirements in most colder regions for minimum R-values for ceiling and wall insulation. Of course code isn't retroactive, so there are still a ton of houses with very poor insulation. There are often reimbursements from the government or energy companies for improving insulation as well. Part of the Inflation Reduction Act included tax credits for improving energy efficiency as well. https://www.irs.gov/credits-deductions/energy-efficient-home-improvement-credit https://www.irs.gov/credits-deductions/energy-efficient-home...