Heat Pumps

Heat Pump Electrical Requirements: What Your Panel Needs

📅 Updated 2026⏱ 8 min read⚡ HomePanelCheck Editorial

Heat pumps heat and cool your home using 2–4x less energy than a gas furnace. But they run entirely on electricity — and that changes your home's electrical math in ways most contractors do not explain upfront.

How Many Amps Does a Heat Pump Use?

Heat Pump Size	Running Amps	Breaker Required	Wire Gauge
1.5-ton mini-split	12–15A	20A dedicated	12 AWG
2-ton central unit	18–22A	30A dedicated	10 AWG
3-ton central unit	22–28A	35–40A dedicated	8 AWG
4-ton central unit	28–38A	45–50A dedicated	8 AWG
5-ton central unit	34–48A	50–60A dedicated	6 AWG

💡 Mini-split advantage: Ductless mini-split systems draw far less electricity per unit than whole-home central systems. If your panel is tight, adding one or two mini-splits for key rooms is a lower-impact starting point without an immediate panel upgrade.

Replacing Gas vs. Adding New Capacity

Replacing a gas furnace: Your existing central A/C outdoor unit likely already has a dedicated 240V circuit. A heat pump often reuses this circuit — your net new load may be modest.

Adding a heat pump where there was none: A brand-new load on your panel. A 3-ton heat pump adds roughly 28A of continuous draw that must fit within your NEC 80% capacity.

Critical — backup heat strips: Many systems include electric resistance backup strips for very cold days. A 10kW backup strip heater draws approximately 42A alone. Always ask for the kW rating and factor it into your load calculation.

Will Your Panel Need an Upgrade?

100A panel replacing existing gas furnace + A/C: Likely fine if the A/C was already on a proper dedicated circuit.
100A panel with no existing A/C, adding a 3-ton unit: Adding 28–35A new continuous load — get a professional load calculation.
100A panel with all-electric appliances + new heat pump: Very likely to need a panel upgrade.
200A panel replacing any gas heating: Almost certainly fine. A 200A panel's 160A usable capacity handles a heat pump in the vast majority of American homes.

⚠️ Watch out for heat strips: Always ask specifically for the kW rating of backup resistance heat strips. A 10kW strip adds ~42A — enough to push a borderline 100A panel over its limit.

Federal and State Incentives

The IRA 25C credit covers 30% of heat pump installation costs, up to $2,000 per year. The same credit covers up to $600 for a panel upgrade necessary to support the heat pump. Check dsireusa.org for your state's specific programmes.

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Questions to Ask Your Installer

"What is the minimum circuit amperage for this specific model?"
"Does this system include backup resistance heat strips, and what is their kW rating?"
"Are you doing a panel load calculation as part of this installation?"
"Is a permit being pulled for both the HVAC and electrical work?"

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