Often, no. Many Canadian homes can add a heat pump without a panel or service upgrade, especially if the heat pump replaces electric heat or the home already has 200-amp service. Homes on 100-amp service that also add electric backup heat, an EV charger or other big loads are the most likely to need one. The only way to know is a load calculation by a qualified electrician, done before you sign a heat pump contract.
Key takeaways
- A heat pump typically needs one dedicated 240-volt circuit. A ducted system with electric backup strips may need two.
- Whether you need an upgrade depends on your service size and calculated load, not just on free breaker slots.
- A full panel or service upgrade is roughly $2,000–$6,000, and can go higher if the utility connection or meter base must change.
- Load management devices, right-sized backup heat and heat pump models with lower current draw can often avoid an upgrade.
- Plan electrical needs for your whole electrification path (heat pump, EV, induction range, heat pump water heater) at once.
Panel vs. service: two different things
People say "panel upgrade" for two separate jobs:
- Panel (load centre) replacement. Swapping the breaker box for a newer or larger one, often because there are no free spaces or the old panel is obsolete or unsafe.
- Service upgrade. Increasing the amperage your home can draw from the grid, for example from 100 A to 200 A. This usually means a new main breaker, meter base and service wires, and coordination with your utility.
You might need one, both or neither. A home with 200-amp service but a full panel may only need a subpanel. A home with a roomy panel but 100-amp service may need a service upgrade if the calculated load is too high.
How electricians decide: the load calculation
The Canadian Electrical Code sets out a method for calculating a dwelling's minimum service size. It's based on floor area, plus specific allowances for space heating, air conditioning, cooking, water heating, EV charging and other large loads. Your electrician compares the result with your existing service rating.
What usually pushes a home over the limit:
- Electric backup heat strips in a ducted air handler, often 5–15 kW.
- An EV charger, often a 40- or 50-amp circuit.
- Electric water heating and cooking on top of everything else.
- Existing electric baseboards that stay in place.
What often works in your favour:
- Replacing gas or oil heat with a modestly sized heat pump with no electric strips, using the existing furnace as backup in a dual-fuel setup.
- A heat pump that replaces baseboard heating, so the new load offsets an existing one.
- Code provisions that allow load management so that big loads don't run at the same time.
Typical scenarios
| Home situation | Upgrade likely? | Why |
|---|---|---|
| 200 A service, gas furnace kept as backup | Rarely | Heat pump adds a modest load |
| 200 A service, all-electric with EV charger | Sometimes | Depends on backup strips and other loads |
| 100 A service, baseboards replaced by mini-splits | Often not | New load partly offsets old one |
| 100 A service, ducted heat pump + 10 kW strips + EV | Often | Combined load exceeds capacity |
| Older fuse panel or recalled panel brand | Yes, for safety | Replacement needed regardless |
General patterns only. Your electrician's calculation is what counts.
Ways to avoid or shrink an upgrade
Right-size the backup heat
Electric resistance strips are the biggest add-on load. In milder regions, or in well-sealed homes, a cold-climate heat pump may need little or no strip heat. Fewer kilowatts of backup can mean no service upgrade.
Use load management
Load management devices (sometimes called load controllers or energy management systems) monitor your total draw. They temporarily pause a load, such as an EV charger or water heater, when the home nears its limit. Code generally recognizes these devices when calculating load, and they usually cost far less than a service upgrade. "Smart panels" do something similar at the panel level.
Choose efficient, lower-draw equipment
Inverter-driven heat pumps ramp up gradually, and some models draw less current at full output than others of similar capacity. Ask your installer to compare circuit requirements, listed on the spec sheet as minimum circuit ampacity (MCA) and maximum overcurrent protection (MOP).
Sequence your upgrades
Air sealing and insulation reduce the heating load, which can mean a smaller heat pump and smaller circuits. Our whole-home energy guide explains why envelope work usually comes first.
What an upgrade involves
If you do need one:
- Permit and utility request. Your electrician pulls a permit and, for service upgrades, arranges a disconnect and reconnect with the utility.
- Equipment. New panel, main breaker and possibly a meter base and service mast or underground conductors.
- Inspection. A provincial or municipal electrical inspector signs off.
- Timeline. The work itself is often one day, but utility scheduling can add weeks.
Approximate costs: about $1,500–$3,000 for a panel replacement on existing service, and $3,000–$6,000 or more for a 100-to-200-amp service upgrade. Long underground runs or meter relocation cost more. Costs vary widely by region and utility.
Plan for your whole electrification path
If you might add an EV, heat pump water heater, induction range or solar system in the next decade, tell your electrician now. One well-planned upgrade, or one load management strategy, is cheaper than piecemeal work. If an EV is on your list, our electric vehicles hub covers home charging options and their electrical needs.
Some provinces and utilities have offered help with panel upgrades as part of electrification programs. Programs change frequently, so check what applies to your address with our rebate finder.
Frequently asked questions
Can I install a heat pump on 100-amp service?
Often, yes, especially ductless mini-splits that replace baseboards or a heat pump paired with an existing furnace. A load calculation will confirm it, and load management can help if you're close to the limit.
How do I know my current service size?
Look at the main breaker at the top of your panel. It's usually labelled 100, 125 or 200. An electrician can confirm it, since the meter base and service wires also matter.
Does a heat pump use more electricity than an air conditioner?
In cooling mode, it's similar. In heating mode it runs far more hours, but at full output it usually draws a similar or slightly higher current than a comparably sized air conditioner. The bigger circuit loads usually come from electric backup strips.
The bottom line
A heat pump doesn't automatically mean a panel upgrade. Get a proper load calculation, think hard about how much electric backup you really need, and consider load management before paying for new service. Treat the electrical question as part of the heat pump decision, not an afterthought. Our geothermal and heat pump overview is a good place to compare systems.
Sundamentals is an independent, non-profit education platform. Program details and prices change often — check current programs for your address in our rebate finder.