Distinguish thermal balance, operating limits and cost-based control decisions before discussing backup heat settings with your installer.
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Updated 2026-09-18 · CANRO Heating & Cooling
When a contractor mentions a heat pump “balance point,” ask which balance point they mean. A home's heating demand, the equipment's available output and an operating-cost comparison are different considerations. They should not be collapsed into one unexplained thermostat setting.
This is a guide to the design conversation, not instructions for changing backup-heat controls. Use the operating strategy established for your equipment and home.
A thermal balance point is the outdoor condition where the heat pump's available heating output matches the home's heating load in the design comparison. Below that point, the planned system may need supplementary heat to meet the full demand, depending on its design.
The point belongs to a particular home and equipment selection. It is not a fixed number for every heat pump in Greater Vancouver, and the outdoor unit's nominal size alone does not determine it.
Natural Resources Canada's sizing guide also distinguishes an economic balance point. That comparison concerns operating cost assumptions, including energy prices and system performance. It need not equal the thermal balance point.
Do not use an old fuel-price comparison as a permanent control recommendation. If cost-based switching is part of the design, ask what inputs were used and who should review them when circumstances change.
An equipment operating limit describes a manufacturer's permitted operating range or a related design constraint. It does not necessarily identify the point at which the home needs supplementary heat or a different fuel becomes less costly.
Ask the installer to label these concepts separately in the explanation. A control setting can reflect several considerations, so copying a temperature from another home's thermostat is not a sound substitute for design.
The exact arrangement matters. A heat pump paired with a furnace and a system using electric supplementary heat may have different sequences and limitations.
Ask for a short written description of expected operation, not just a photograph of installer menus. Record the equipment models and the reason for any agreed control strategy. If operation appears inconsistent with that explanation, note the conditions and contact the installer.
Do not disable backup heat to chase a lower electricity reading or force the heat pump past its intended controls. For a new proposal, understanding the sequence helps you compare designs. For an existing system, a professional assessment is needed before changing technical settings.
Technical references checked 2026-09-18. The planning examples are illustrative; equipment instructions and project requirements must be checked for your home.
For help with a residential HVAC project in Greater Vancouver, contact CANRO with your equipment details and the question you need answered.
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