Sam Gorman

Estimate a low-to-high installed cost for a tankless water heater using your heater, labor, and extra-work estimates.

Estimate yearly, monthly, daily, bill-period, long-term, therm, and CO2 costs for a natural gas water heater.

Estimate electric water heater kWh, monthly cost, yearly cost, and savings from a higher UEF model.

Estimate water heater cost per day, month, and year from hot water use, temperatures, heater type, and local energy price.

Calculate ACH50 from blower-door CFM50 and conditioned volume, with a rough normal-condition planning range.

Calculate ACH50 from a blower-door CFM50 reading and conditioned volume, or estimate volume from floor area and ceiling height.

Estimate annual heating and cooling bill savings, monthly savings, net project cost, and simple payback for air sealing.

Estimate crawl space insulation area, material to buy, and total cost with waste, rim joist, and ground cover add-ons.

Calculate wall insulation packages from wall area, openings, package coverage, extra material, and cavity depth.

Estimate added attic insulation R-value, depth, whole loose-fill bags, and optional bag material cost for a vented attic floor.