BTU Guide: Choosing Your Heat Pump Capacity

Measuring a room to choose heat pump capacity

Why heat pump capacity matters

A correctly sized heat pump heats and cools steadily, uses less energy and lasts longer. If it is too powerful, it short-cycles: in summer it cools without removing humidity (cold, damp air), and in winter it blows very hot air in bursts. If it is too small, it runs nonstop without reaching the set temperature.

What determines how many BTUs you need

  • Room dimensions: length, width and ceiling height.
  • Insulation: a newer home needs much less capacity than an older house or a log cottage.
  • Windows and exterior doors: how many, how large, which way they face and the type of glazing.
  • Region: the colder the winter, the higher the heating needs.
  • Layout: open area, closed rooms, several floors.

These factors add up: two rooms with the same floor area can have very different needs. That is why we do not give a square-foot rule.

Calculate your capacity in a few minutes

The free BTU calculator accounts for all these factors and recommends the right capacity: 9,000, 12,000, 18,000 or 24,000 BTU, or a multi-zone system for several rooms.

Calculate my BTUs →

Kanartic models

To go further, read our complete guide to choosing heat pump capacity.

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