Energy & HVAC calculators
Heating, cooling, solar and electricity costs, with payback math.
HVAC replacementCost
Enter your home size, climate and system type to get a rough tonnage, an installed price range and how much a higher-SEER2 unit could cut your cooling bill.
Solar paybackCost
Enter your monthly electricity use and local price per watt to size a solar system, estimate its cost after incentives and see the year it pays for itself.
InsulationCost
Enter the area, where you are insulating and what is there now to see the R-value to add, the depth it takes for each material and a cost range.
Electricity cost
Choose an appliance or enter its wattage, how long it runs and your electricity rate to see the energy it uses and what it costs per day, month and year.