100A vs. 200A vs. 400A Service: Sizing Your Panel for a Modern Pittsburgh Home

When we quote a panel upgrade in Pittsburgh, the first question we ask is: what size service are we putting in? 100-amp, 200-amp, or 400-amp. It is not a trick question, each answer is right for some homes and wrong for others. The key is matching the service to how the house is actually going to be used over the next 20 years, not the last 20.

What “Amps” Actually Means

Your electrical service has two measurements: voltage (240V at the main breaker in a residential home) and current capacity (the amp rating of the main breaker). Multiply them and you get how much total power the house can pull at once.

• 100 amps x 240V = 24,000 watts (24 kW), simultaneous capacity.
• 200 amps x 240V = 48,000 watts (48 kW).
• 400 amps x 240V = 96,000 watts (96 kW).

You will never use all of that at once. The numbers that matter are the expected simultaneous loads, and whether they fit under that ceiling with code-required safety margins.

100-Amp Service: When It Still Makes Sense

A 100-amp service is enough for a surprising number of Pittsburgh homes. Specifically:

• Homes under 2,000 square feet without major electric loads.
• Houses where the primary heat is gas (boiler or forced air) and the water heater is gas.
• Homes without central AC, or with a small central AC unit.
• Homes not planning to add an EV charger, heat pump, or induction range.

Lots of Pittsburgh homes fit this profile, postwar ranches in Carrick, older capes in West View, bungalows in Dormont. If you are staying with gas appliances and have no electrification plans, a 100-amp panel in good condition is fine.

Where 100 amps breaks down: the moment you add a 40-amp EV charger, a heat pump, or an electric range, the load calculation starts to get tight. We can sometimes keep the 100-amp service with smart load management, but for most families who are electrifying anything, the answer is to upgrade.

Cost: New 100-amp panel installations typically run $2,200 to $3,400 in the Pittsburgh market if the service entry and meter stay the same.

200-Amp Service: The Standard Today

If you are building new, remodeling substantially, or upgrading because the old panel has to go, 200 amps is the default answer for almost every Pittsburgh home under 4,000 square feet.

200 amps comfortably handles:

• Central AC or heat pump
• Electric water heater or heat pump water heater
• Electric range and oven
• Electric dryer
• One Level 2 EV charger (40-48 amps)
• All your lighting, outlets, small appliances, and specialty circuits

There is room left over for a future hot tub, workshop subpanel, or second EV charger if things evolve. The per-breaker cost difference between a 100-amp and 200-amp service is small compared to the total job, maybe $400 to $700 of the total installed price. If we are already pulling a permit and coordinating with Duquesne Light, upgrading to 200 amps is almost always the right call.

Cost: A full 100A-to-200A service upgrade in Pittsburgh runs $3,200 to $5,800 installed, depending on whether we need to replace the meter socket, service entrance cable, and ground system.

400-Amp Service: When You Actually Need It

400-amp services are overkill for most homes. We install them for specific situations:

• Homes over 4,500 square feet with all-electric loads, especially with electric heat.
• Homes with a detached workshop or barn that needs its own 200-amp feed.
• Homes with two or more Level 2 EV chargers plus full electrification (heat pump, water heater, range).
• Homes with a pool, hot tub, and outdoor kitchen.

A 400-amp service is usually delivered as two 200-amp panels side-by-side or a single 400-amp meter with a 200-amp main plus a 200-amp subpanel in the workshop. Duquesne Light has specific requirements for the meter and service entry, typically a larger meter base, a specific service mast or underground lateral, and a heavier grounding scheme.

Cost: $7,500 to $15,000 installed, depending on how much of the old service has to come out and whether the utility requires trenching or a new service drop.

What Duquesne Light Requires

You cannot just pick a service size without coordinating with the utility. Duquesne Light has:

• Standard specs for meter sockets at 100A, 200A, and 400A.
• Rules about service mast height and clearances over roofs and walkways.
• A preference for underground service where it already exists.
• A scheduling process for the brief service cut when we transfer the load to the new panel.

Your electrician handles the coordination. You just need to know that Duquesne Light has a say in what goes in, we cannot just install a 400-amp service on a street that cannot support one.

The Heat Pump Question

This one comes up a lot in 2026. Homeowners considering a gas-to-heat-pump conversion want to know what service they need.

• A typical 3-ton heat pump pulls 30 to 45 amps peak.
• Paired with a resistive backup (electric strip heat in the air handler), that can jump to 80+ amps peak.
• Our rule: if you are adding a heat pump to a 100-amp service and keeping gas backup, you are usually fine. If you are going all-electric with strip heat backup, upgrade to 200 amps.

How to Think About It

The right question is not “how many amps do I use today?” It is “how many amps will I use in 10 years, given what I am likely to add?” Panel upgrades are disruptive, moderately expensive jobs. Doing one twice because we sized too small the first time is the worst possible outcome.

If you are planning any of these in the next 5 to 7 years, EV charger, heat pump, induction range, pool, workshop, ADU, factor them into the decision now and size up once.

Request a service assessment and we will walk through your current load, your planned additions, and the right size for your home. Straight talk, no upsell.

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Frequently Asked Questions

How many amps does my Pittsburgh home need?

A modern all-electric home with central AC, electric dryer, and EV charging typically needs 200-amp service. Gas-heated homes without EV charging can still run comfortably on 100-amp if the panel has open slots. 400-amp service is reserved for large homes, in-law suites, or multi-EV households.

Is 100-amp service enough for a modern Pittsburgh home?

It can be, if you have gas heat, gas dryer, and no EV. Adding central AC, a heat pump, or a Level 2 EV charger usually pushes past what 100A can handle per NEC load calculations — and Duquesne Light will typically bump you to 200A during an upgrade anyway.

Does adding EV charging require 400-amp service?

No, not for a single Level 2 charger. 400-amp service makes sense for homes with two EVs charging simultaneously, a detached shop or ADU with its own sub-panel, or electric heat plus two EVs. Otherwise 200A is plenty.

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Related Reading from Our Pittsburgh Electricians

• Signs Your Pittsburgh Home Needs a Panel Upgrade (FPE, Zinsco, and 60-Amp Service)
• Can Your Pittsburgh Home Handle an EV Charger? A Panel and Service Check

Need a Licensed Pittsburgh Electrician?

Renaissance Electric & Power Systems has been serving Pittsburgh homeowners since 2008 with licensed, insured work backed by our PA contractor registration (PA-032900). Whether you need a panel upgrade, EV charger installation, recessed lighting, or whole-home surge protection, we handle it start-to-finish.

Call 1-888-681-WIRE (9473) or request a free estimate.

Service areas: Pittsburgh, Mt. Lebanon, Upper St. Clair, Bethel Park, Peters Township, Fox Chapel, Sewickley, Robinson Township, McCandless, Franklin Park, Hampton Township, O’Hara Township, Edgeworth, Sewickley Hills, and Bell Acres.