Will your panel handle a heat pump?

A 200 amp panel upgrade is not automatic. Whether your panel can take a heat pump depends on a load calculation, not the number on the main breaker. Here is a quick version of the one your electrician will do.

Your panel and your plan

Main breaker, amps (required)

The number on the big breaker at the top of the panel.

Floor area, square feet (required)

Highest demand in the last 12 months, kW

Optional. From your utility's smart meter data. Uses NEC 220.87 instead.

What runs on electricity todayTick what you have. Gas appliances do not count.

Electric baseboard or furnace heat, kW

Optional. Total of the heaters' labels.

EV charger circuit, amps

Optional. The charger's breaker.

What you plan to addA heat pump replaces central AC. A heat pump water heater replaces an electric tank.

Heat pump

Heat pump dryer (240 V)

Backup heat strip with the heat pump

Heat pump nameplate, watts

Optional. We assume 6,000 W (25 A) if empty.

Heat pump water heater

Induction range

EV charger

Nothing you enter is stored. An electrician confirms the real number before any work.

Example: a 100 A panel in a gas-heated home

A 1,850 sq ft home with central AC, adding a cold-climate heat pump with a 5 kW backup strip and a 120 V heat pump water heater. Enter yours above.

Example

About 86 of 100 amps at the calculated peak (86%).

Your home today, calculated38.7 A
Heat pump + 5 kW backup (assumed size)+45.8 A
Heat pump water heater (120 V) (assumed size)+1.8 A
Headroom left13.6 A

Tight

Fits on paper, with little room to spare.

The calculation fits under 100 A, with 13.6 A to spare. One of the options below usually buys comfortable room without a service upgrade.

An electrician confirms it with a full load calculation during the survey. Utility service work, if needed, adds lead time, so ask early.

Example figures, not your home.

Every load we counted

Loads in the calculation, with their size and the amps they add
Load	Size, VA	Adds, after demand factors
General lighting and outlets (1,850 sq ft × 3 VA)Today	5,550	19.1 A
Kitchen small-appliance circuits (2 × 1,500 VA)Today	3,000	10.3 A
Laundry circuitToday	1,500	5.2 A
DishwasherToday, assumed typical size	1,200	4.1 A
Heat pump + 5 kW backupNew, assumed typical size	11,000	45.8 A
Heat pump water heater (120 V)New, assumed typical size	1,100	1.8 A

Ways to avoid an upgrade

Each one is run back through the same calculation, so the amps are what it would change for this home.

Keep your furnace as backup (dual fuel)
If you have gas, keeping the furnace for the coldest hours removes the heat strip from the calculation, at the cost of keeping a gas connection.
Frees about 20.8 A
An energy management device
The 2023 NEC (220.70) lets a device that caps the home’s total current be counted in the load calculation. It pauses a water heater or car charger when the heat pump needs the capacity. Ask your building department whether the 2023 NEC applies where you live.
A smart panel
A panel that monitors every circuit and sheds lower-priority loads does the same job, with an app. Some utilities, such as Holy Cross Energy, rebate it.

How this works

NEC 220.83(B), the optional method for adding heating or cooling to an existing home, or 220.87 when you give a measured peak.

The calculation

Heating or cooling, whichever is larger, at 100%: 11,000 VA (heating).
All other loads: 12,350 VA. The first 8,000 VA counts in full; the remaining 4,350 VA counts at 40%, so 9,740 VA.
Total 20,740 VA ÷ 240 V = 86.4 A, against a 100 A service.
Before the new equipment the same method gives 14,300 VA, or 59.6 A.

What this assumes

A screening estimate. A licensed electrician confirms it with a full load calculation, and your building department has the final say.
We assume a new heat pump replaces central AC, a heat pump water heater replaces an electric tank, induction replaces an electric range, and a heat pump dryer replaces an electric dryer.
Values marked "assumed" are typical nameplate ratings; your equipment labels are better.
A panel can also need replacing for age, condition, a recall, or no free breaker spaces, which a calculation cannot see.

Sources

More detail: Do I need a bigger electrical panel for a heat pump?

Get the real load calculation

Your plan includes an electrician's load calculation, the right-sized heat pump and the rebates you can stack, including panel rebates where your utility offers them.

Get my home plan