How do I prepare my home's electrical system for a heat pump installation in NB?

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New Brunswick Electrical · Accepted Answer

Preparing Your Electrical System for a Heat Pump in New Brunswick

Heat pumps are becoming the go-to heating upgrade in New Brunswick, driven by rising oil and propane costs and NB Power incentive programs. But before the HVAC installer arrives, your electrical system needs to be ready.

Electrical Requirements by Heat Pump Type

Mini-split heat pump (ductless, single zone):
- Circuit: Dedicated 240V, 15–30 amp (depends on BTU rating)
- Wire: 10/2 or 10/3 NMD90 typical
- Breaker: 2-pole 15A, 20A, or 30A
- Disconnect: Required — a lockable disconnect switch within sight of the outdoor unit
- Most common in NB: 12,000–24,000 BTU units requiring a 20A or 30A, 240V dedicated circuit

Multi-zone mini-split (2–4 indoor heads, one outdoor unit):
- Circuit: Dedicated 240V, 30–50 amp
- Wire: 8/2 or 6/2 NMD90 depending on unit
- Breaker: 2-pole 30A or 40A
- Higher amperage draw because the outdoor compressor serves multiple indoor units

Central ducted heat pump:
- Circuit: Dedicated 240V, 30–60 amp
- Additional circuit: May need a separate circuit for the air handler if it has electric backup heat strips
- Wire: 6/2 or larger NMD90
- Breaker: 2-pole 30A to 60A depending on system size

Panel Capacity Check

This is the critical first step. Your electrician will:

1. Read your main breaker rating — 100A, 150A, or 200A
2. Add up all existing circuit breakers — this gives the theoretical maximum load (usually well above the actual simultaneous draw)
3. Calculate your actual peak demand — using CEC load calculation rules (Rule 8-200)
4. Determine available capacity for the heat pump circuit

Common findings in NB homes:

| Panel Size | Heat Pump Feasibility |
|------------|----------------------|
| 200A | Almost always has room for any residential heat pump |
| 150A | Usually fine for a single mini-split; may be tight for multi-zone or central |
| 100A | Often at or near capacity, especially with electric water heater, dryer, and stove. Panel upgrade likely needed. |
| 60A | Panel upgrade required — not enough capacity for a heat pump plus existing loads |

Panel Upgrade Costs

If your panel can't accommodate the heat pump:

| Upgrade | Cost |
|---------|------|
| 100A to 200A panel upgrade | $2,500–$4,500 |
| 60A to 200A (full service upgrade) | $3,500–$6,500 |
| Add tandem breakers to free space (if panel supports them) | $75–$200 |

Disconnect Switch

The CEC requires a lockable disconnect switch within sight of the outdoor heat pump unit, mounted between 1.4m and 2m above grade. This allows service technicians to safely de-energize the unit. The disconnect must be rated for the circuit amperage.

Cost: $100–$250 installed (typically included in the heat pump electrical package).

NB Power Programs and Rebates

NB Power's Total Home Energy Savings Program has offered rebates for heat pump installations — amounts and eligibility change periodically. As of 2025–2026:

- Rebates have ranged from $500–$5,000 depending on the program year and system type
- Pre-approval may be required before installation
- The home may need an energy assessment (EnerGuide evaluation)
- Check NB Power's website or call 1-800-663-6272 for current program details

These rebates do NOT cover the electrical work — that's your cost. But the overall savings from switching off oil or baseboard electric to heat pump typically repay the electrical investment within 2–4 years.

Total Electrical Costs for Heat Pump Installation

| Scenario | Electrical Cost |
|----------|----------------|
| Mini-split, 200A panel, short run | $400–$800 |
| Mini-split, 200A panel, long run | $700–$1,200 |
| Mini-split, panel upgrade needed | $3,000–$5,500 |
| Multi-zone or central, 200A panel | $800–$1,500 |
| Multi-zone or central, panel upgrade needed | $3,500–$6,000 |
| TSANB permit | $50–$100 |

Coordination and Timeline

1. Contact your electrician first — even before the HVAC company. Have them assess your panel and run the load calculation. This determines whether you need a panel upgrade, which adds 1–3 weeks to the project.

2. HVAC company provides electrical specs — they'll tell the electrician the exact circuit size, wire gauge, disconnect requirements, and communication cable needs.

3. Electrician runs the circuit — this can often be done before the heat pump is installed, so the circuit is ready when the HVAC crew arrives.

4. TSANB inspection — your electrician arranges this. In Moncton, Saint John, and Fredericton, expect 3–5 business days for scheduling.

5. HVAC installation — connects the unit to the pre-wired circuit and disconnect.

Planning the electrical work alongside (not after) the heat pump purchase avoids the common frustration of having a heat pump delivered but no circuit to power it.

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