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What Size Heat Pump Do I Need?

The right heat pump size comes from a load calculation that balances your home's heating and cooling needs — based on insulation, windows, air sealing, layout, and climate, not square footage alone. Heat pumps are especially sensitive to sizing: an oversized unit short-cycles, hurting efficiency, comfort, and humidity control.

Sizing a Heat Pump Is a Balancing Act

Unlike a furnace, a heat pump both heats and cools, so it must be sized to satisfy both loads efficiently. Measured in tons or BTU/h, the correct capacity comes from a proper Manual J-style calculation. Because heat pumps run best at steady, modulated output, accurate sizing matters even more than with traditional equipment.

The Problem with Oversizing

An oversized heat pump cools or heats the space too quickly, then shuts off, cycling on and off. This reduces efficiency, causes temperature swings, and — in cooling mode — fails to remove humidity properly. A correctly sized, variable-speed heat pump runs in long, steady cycles for even comfort and peak efficiency.

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Related Questions

Why is heat pump sizing so important?

Heat pumps are sensitive to sizing because they run most efficiently at steady output. Oversizing causes short-cycling, poor humidity control, and reduced comfort and efficiency.

Can one heat pump heat and cool my whole home?

Yes — a correctly sized central or multi-zone heat pump can handle both heating and cooling for the whole home. The right configuration depends on your layout.

How is heat pump capacity measured?

In tons or BTU/h for cooling, with corresponding heating output. We calculate both loads to size your system accurately.

HeatLand Heating & Cooling has installed and serviced heating systems across Greater Vancouver since 1999. All gas work is performed by TSBC-certified technicians. Information here is general guidance — contact us for advice specific to your home.

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