basement has 3 rooms - living, bed, and bath. living is probably 400sf, bed is 200, bath is 150. there's also a garage on the ground level that stays pretty warm (warmer than the basement it seems). right now, i believe there to be no insulation below the drywall, so i plan to demo all that and install some CCF green foam (https://www.sprayfoamkit.com/) with some 1" xps foam below the subfloor (which will then get carpeted). i think it will have substantial insulation by the time all is said and done.