I'm shocked and disappointed at how expensive retrofitting insulation into a minimally insulated 1930s Bay Area house actually is. I estimate gas heating costs at around 2500$ / year (nov-march), while insulating floors, walls and roof would cost a shocking 60K$ for an average size 3bdrm.
If the insulation cuts heating cost in half, that's a 1250$ savings per year, meaning a 48 year break even time assuming zero discount rate. It absolutely doesn't make sense to do the work unless there's a massive tax subsidy or contractor costs come down (which is bad for the environment)
If the insulation cuts heating cost in half, that's a 1250$ savings per year, meaning a 48 year break even time assuming zero discount rate. It absolutely doesn't make sense to do the work unless there's a massive tax subsidy or contractor costs come down (which is bad for the environment)