What Size Heat Pump Do I Need?

Choosing the correct size heat pump in Scotland is crucial for energy efficiency, comfort, and the longevity of the unit itself. As a heating engineer, I understand the complexities involved in selecting the right heat pump for your home. Here’s a comprehensive guide to help you make an informed decision.

Understanding Heat Pump Sizing

Heat pump sizing is typically measured in kilowatts (kW). It’s essential not to opt for a unit that is too large or too small for your space. An oversized unit will cycle on and off frequently, reducing efficiency and increasing wear and tear. Conversely, an undersized unit will struggle to heat or cool your home effectively, leading to increased energy use and costs.

Factors to Consider

  1. House Size and Layout: The size of your home is the primary factor. Generally, more square footage requires a higher capacity heat pump.
  2. Insulation: Well-insulated homes retain heat more effectively and therefore may require a smaller heat pump compared to homes with poor insulation.
  3. Climate: The climate in your area plays a significant role. Homes in colder climates will need heat pumps with higher capacity to maintain comfort during harsh winters.
  4. Existing Heating Systems: If you are integrating the heat pump with another heating system, this could influence the size needed.

Calculating the Right Size

A rough estimate is that you’ll need approximately 0.1 kW per square meter of floor area. For precise calculations, a professional assessment is recommended. This involves analysing various aspects of your home and using detailed heat loss calculations.

Professional Installation and Advice

For optimal efficiency, it’s important to have your heat pump installed by professionals. Incorrect installation can lead to inefficiency and increased costs over time.


Selecting the right size heat pump is a critical decision that can significantly impact your home’s comfort and your heating costs.

For expert advice and installation services in Scotland, please contact us. Our team is dedicated to helping you choose the perfect heat pump to suit your needs and ensure it is installed perfectly for your home.

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