Insulation & Windows Calculators
Six calculators to quantify heat loss, evaluate insulation upgrades, and estimate the running costs of pools, hot tubs, and generators.
R-Value Calculator
Estimate the R-value of your existing insulation and find out how much heat (and money) you're losing each year.
Wall & attic modesWindow Heat Loss Calculator
Calculate how much heat your windows lose in winter based on U-factor, area, and indoor/outdoor temperature.
U-factor lookup includedCeiling Fan vs AC Cost
Compare the electricity cost of running a ceiling fan vs air conditioning for the same cooling effect.
Summer & winter modesPool Pump Cost Calculator
Annual electricity cost of your pool pump based on motor size and run hours per day.
Variable speed savingsHot Tub Cost Calculator
Monthly and annual electricity cost to heat and run your hot tub, including insulation quality.
Cover quality factorGenerator Fuel Cost Calculator
Cost to run a gas or propane generator per hour, per day, and per outage.
Gas & propane modesWhy insulation and windows matter
All figures are estimates for typical US homes in cold or mixed climates. Results vary significantly by climate zone, home age, and current insulation level.