Project capacity guide
Do you need 200 amps for a heat pump?
Electrical-capacity planning for a heat pump at home.
Short answer
A heat pump does not automatically require 200A service. The decision depends on equipment type, backup heat, existing heating fuel, compressor demand and other electric loads.
Key takeaways
01Start with equipment specifications and the home’s current demand.
02Panel space does not prove service capacity.
03The project should be assessed before equipment is purchased or installation is booked.
What determines capacity
The contractor needs to review equipment type, backup heat, existing heating fuel, compressor demand and other electric loads. The applicable calculation and local permit rules determine the acceptable design.
Alternatives to a service increase
staged equipment planning or load management may apply to parts of the project. Any alternative still needs to be approved for the equipment, installation and jurisdiction.
What to prepare
Bring the equipment model or expected rating, service-size clues, existing major loads, panel-space information and future project plans.
Field notes / decision evidence
Assess the whole heating system
The outdoor unit is one part of the electrical plan. Backup heat and other fuel changes can drive the larger question.
Selected equipment
Record the outdoor unit, indoor equipment and electrical nameplates. Ask whether the design includes electric auxiliary or backup heat.
Other electrification
Identify a planned electric water heater, induction range, EV charger or air conditioner replacement at the same time. The sequence matters when planning future capacity.
Quote boundary
Separate HVAC equipment, dedicated electrical circuits, panel changes and any service or utility work in the written scope.
Illustrative scenarioExample only: a heat pump with electric backup heat can create a different planning question from one that retains another backup fuel. The equipment schedule must be known first.
Decision table
What the evidence changes
- Automatic 200A requirement
- No
- Decision evidence
- Applicable load calculation + equipment information
- Possible paths
- Existing service, distribution change, management or service upgrade
Typical project sequence
From question to documented work
- 01Choose equipment concept
- 02Check existing service and loads
- 03Complete calculation
- 04Confirm permit / utility path
- 05Install and inspect
Sequence and responsibilities vary by jurisdiction, utility and scope.
Evidence
Sources and verification
Published by the 200AmpPanel.ca Research Team, a HAUSE specialist property. Updated 2026-09-29.
Questions
Frequently asked
Can a 100A home support a heat pump?
Sometimes. The service size alone cannot answer; existing demand and project design matter.
What should I do next?
Use the Capacity Check to organize what you know, then have a qualified electrical contractor complete the assessment required for the property and jurisdiction.
Your next step
Bring the right facts to the first conversation.
Record the visible service clue, planned equipment and any relevant documents. The free brief organizes your questions; a qualified person verifies capacity and scope.