The electrical panel is the one piece of equipment every circuit in your house runs through, and in the mountains it works harder than it does almost anywhere else. Electric heat, a well pump, engine-block heaters, a full house of guests on a snow weekend — and now, for a growing number of owners, an EV in the garage. A panel that was adequate when the house was built is often not adequate for how the house is used today.
This guide covers what a panel upgrade actually involves, why mountain homes tend to outgrow their panels sooner than valley homes, what a load calculation is, and when stepping up to 200-amp service is the right call.
Why mountain homes outgrow their panels
Snow country stacks electrical loads in a way milder climates don't. Electric heat — baseboard, wall heaters, or a heat pump with resistance backup — is one of the largest loads a home can carry, and it runs hardest exactly when everything else is running too. Add a well pump, a septic pump, heat tape on the roof or pipes, a hot tub, and the picture changes fast. Then comes the EV: a Level 2 charger is typically a 30- to 50-amp circuit that runs continuously for hours, which the electrical code treats as a continuous load and sizes accordingly.
Meanwhile, many older cabins and mountain homes still run on 60- or 100-amp services that were sized for lights, a range, and not much else. The house didn't change — the way we live in it did.
What a panel upgrade actually involves
A panel upgrade is more than swapping a gray box. Depending on the house, the scope usually includes:
- The panel itself — a new loadcenter with enough spaces for today's circuits and tomorrow's, with legible, accurate labeling.
- Service equipment — in many cases the meter enclosure and service-entrance conductors are upgraded along with the panel, coordinated with the utility for disconnect and reconnect.
- Grounding and bonding — the grounding electrode system and bonding connections are brought up to current code, which is one of the biggest safety gains of the whole project.
- Breaker protection — modern AFCI and GFCI protection where the code requires it, which older panels simply can't provide.
- Circuit verification — each existing circuit is landed, tested, and labeled, which is often the first time anyone has mapped the house accurately.
Done right, the result is a service that is safer, mapped, and sized with real headroom — not just a bigger box.
What a load calculation is
The size of your service isn't a matter of opinion. The National Electrical Code lays out a calculation method that adds up your home's loads — general lighting and receptacles by square footage, fixed appliances, heating or cooling (whichever is larger), and dedicated loads like EV charging — then applies demand factors that reflect how loads actually overlap in practice. The output is a number in amps, and that number, not a guess, determines what your service needs to be.
This is the heart of how we work: calculated, not eyeballed. Before we recommend a panel size, we run the load calculation on your actual house — your square footage, your heat source, your well pump, your charging plans. If the arithmetic says your existing service is adequate, we'll tell you that, too.
Permits and inspection
A panel or service upgrade typically requires a permit and an inspection, and utility coordination for the disconnect and reconnect. We handle that process — the paperwork, the scheduling, and the inspection itself — so the project stays on rails and the work is documented. A permitted, inspected upgrade also matters later: at sale time, at insurance time, and any time a future electrician needs to trust what's behind the cover.
When 200 amps makes sense
Not every home needs 200-amp service, but the load calculation makes the decision straightforward. Stepping up to 200 amps usually makes sense when:
- The calculation lands close to the limit of your existing service — running a service near its ceiling leaves no room for anything new.
- You have (or plan) electric heat plus EV charging. Those two loads together are what push most mountain homes past a 100-amp service.
- You're renovating anyway. If walls are open or service equipment is being touched, sizing for the next twenty years costs far less than doing the job twice.
A large share of the cost of a service upgrade is in the work itself — the labor, coordination, and code updates happen at either size — so when the calculation is anywhere near the line, the bigger service is usually the sound engineering choice.
The bottom line
If your panel is original to the house and your loads aren't, start with the arithmetic. You can read more about our panel upgrade service, or request an estimate and we'll run the load calculation on your actual house — and give you a straight answer about what it needs.