Chart
Heat pump balance point and backup heat chart
Show how outdoor temperature, building heat loss, heat pump capacity, and backup heat interact in cold Canadian weather.
Chart boundary
Does not size a heat pump, calculate heat loss, approve backup heat, or replace HVAC design.
balance point curve
Capacity crosses heat loss
The useful chart is the crossing point: when house heat loss exceeds heat pump capacity, supplemental heat may enter the discussion.
Scopeheating and hvacX-axisoutdoor temperature CY-axiscapacity and heat loss kWReviewAnnualNextHeat pump electric backup load impact chart
Heat loss curverises as temperature falls
Building envelope controls the slope.
Heat pump capacityfalls in cold weather
Equipment data controls the curve.
Balance pointcurves cross
Below this point supplemental strategy may matter.
Backup regionshaded cold band
Electrical impact belongs in the backup-load chart.
Decision reference
Explain the balance-point curve concept before electrical load and backup heat checks.
| Curve band | What it shows | Risk cue | Handoff |
|---|---|---|---|
| Above balance point | Heat pump can cover the building load | Low backup heat use | HVAC sizing data |
| Near balance point | Capacity and heat loss are close | Comfort and control strategy matter | Contractor review |
| Below balance point | Supplemental heat may be needed | Electrical backup load can be large | Backup load impact chart |
Use notes
- Use this chart as a planning and conversation aid only.
- Confirm current utility requirements, product markings, manufacturer instructions, and local authority requirements before field work.
- Use the linked calculator or table when the task needs project-specific arithmetic.
Reference sources
Open the underlying public references before treating the chart as project guidance.