Home tools & calculators

Your home’s year, dated from local climate normals: when AC season starts, when pipes are at risk, when rodents move in, when to blow out the sprinklers. Instant, no sign-up.

Enter the year your house was built and see which systems are past their typical life and which era materials a pro will check for. Instant, no sign-up.

Does this job need a permit? Pick the job and your state to see the rule, who issues it, what the inspector checks and why the licensed pro pulls it.

Who licenses plumbers, HVAC contractors and electricians in your state, whether the license is state or local, and where to check a license number.

Furnace output and heat pump size for your home from floor area, insulation and your winter design temperature. Instant, no sign-up.

Does a heat pump work in your winters? A verdict from your area’s own lows: carries on its own, needs backup, or dual-fuel.

Should you repair or replace your AC, furnace or heat pump? A verdict from age, typical service life, the failed part and repeat repairs.

Find your furnace or AC filter size from the frame or a tape measure, the right MERV rating and how often to change it, with a calendar reminder.

How much heating or cooling energy a thermostat setback trims, from degrees and hours a day. Percent only, based on the DOE rule.

Therms, gallons or kWh: how much of each fuel a home like yours burns in a year, so you can multiply by your own bill and compare.

Turn the serial number on your furnace, AC or heat pump into its manufacture year, its age and whether it is in the replacement window. Instant, no sign-up.

Enter the year your home was built and any warning signs to see which wiring-era risks apply (aluminum, knob-and-tube, Federal Pacific panels, ungrounded outlets) and how soon to have it inspected.

Pick the circuits you want to keep on during an outage and get the generator class that covers them, in kilowatts, with transfer-switch and fuel notes.