Byron Wise working on ceiling wiring in a Sacramento-area home

Load calculations

Know what your panel can handle before you buy

A load calculation shows whether your existing electrical service can safely support new equipment like a heat pump, EV charger or electric water heater. It’s the difference between a simple circuit and an unnecessary panel upgrade.

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From $295
For homeowners and contractors
Documented to code method
Clear answer and options

Why it matters

The answer you need before an electrification project

Heat pumps, induction ranges, heat pump water heaters and EV chargers all add load. A load calculation adds up what your home already uses and what you’re adding, using the method in the electrical code, and compares it with your service size.

If you have room, you can go ahead with confidence. If you don’t, Byron will explain the options, from load management to a service upgrade, before you commit to anything.

Residential load calculation

from $295

The price depends on the size of the property, the electrical information available and the level of documentation required.

Free estimate, firm quote by the job
Permits handled when required
1-year parts and labor guarantee

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For contractors, too

Load calculations for HVAC, plumbing and other trades

WiseCo provides residential load calculations for homeowners and for HVAC, plumbing and other contractors planning heat pumps, electric water heaters, appliances and related upgrades. Starting at $295, with the documentation you need for the permit.

Homeowners and contractors
Heat pumps, water heaters and EV chargers
Tells you whether an upgrade is really needed
Documentation for permitting

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Who it’s for

Load calculations for homeowners and contractors

Homeowners
Planning a heat pump, EV charger, induction range, hot tub or addition? Find out what your service can carry first.
HVAC contractors
Documented load calculations for heat pump and air conditioning installs, so your equipment goes in on an adequate service.
Plumbing contractors
Electric and heat pump water heater projects, including gas-to-electric conversions.
Remodels and additions
Documentation for permit applications on kitchens, additions and ADUs.

What you get

What’s included

Review of your existing service, panel and major loads
Calculation using the electrical code method for dwellings
A clear answer: room to spare, tight, or over capacity
Options if you’re short, from load management to an upgrade
Documentation suitable for your contractor or permit file

What a load calc looks at

Your service size sets the limit

The meter and main panel decide how much power your home can draw. A load calculation adds up what you have and what you’re planning, and shows how much room is left.

It’s the difference between an upgrade you need and one you don’t.

A new exterior panel with labeled breakers — Real WiseCo jobYour service size sets the limit. A load calculation shows how close you are.

Questions

Common questions

Don’t see yours? Text Byron. You’ll get a real answer from the person doing the work.

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How much does a load calculation cost?

Load calculations start at $295. The price depends on the size of the property, the electrical information available and how much documentation you need.

Do I need a load calculation for a heat pump?

If your panel is 100 or 125 amps, or you’re adding several electric appliances, it’s a smart step before you buy. Many contractors and permit offices ask for one.

I’m an HVAC or plumbing contractor. Do you work with contractors?

Yes. WiseCo provides residential load calculations for HVAC, plumbing and other contractors, and can do any electrical work the project needs.

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