Heat From Air

The Role of Insulation in Maximising Air Source Heat
Pump Efficiency.


As the world continues to prioritise sustainable and efficient energy solutions, air source heat pumps have emerged as a popular choice for heating and cooling residential and commercial spaces.

Heat pumps are highly efficient systems that extract heat from the outdoor air and transfer it indoors, providing comfortable temperatures throughout the year. However, to truly maximise the efficiency of a heat pump system, it is crucial to address another essential factor: insulation.

Within this blog, we will explore the significant role of insulation in optimising the efficiency of air source heat pumps.

Understanding Air Source Heat Pumps.

Before delving into the importance of insulation, it’s essential to have a basic understanding of how air source heat pumps work.

Air source heat pumps use a refrigeration cycle to extract heat energy from the outdoor air, even in cold weather conditions (as low as  -20 degrees Celsius). This heat is then transferred indoors to heat the building through central heating systems such as radiators or underfloor heating and can also provide hot water. In warmer months, the process can be reversed, effectively cooling the interior spaces (but only for certain models)!

Maximum efficiency and sustainability is what everyone building owner should be aiming for and heat pumps are a fantastic step to achieving this.

What is Insulation?

Insulation is material designed to prevent heat or sound from being transmitted from one area to another. It’s normally used to keep heat and/or sound in or out of your home, or to confine it to certain parts of your house. Insulation can work in a number of different ways, but it most commonly incorporates materials that consist of millions of tiny pockets of air. Still air is an extremely good insulator, and trapped pockets of air are what give most types of insulation their high thermal resistance.

Insulation plays a vital role in maximising the efficiency of an air source heat pump system by reducing heat loss or gain within a building. Proper insulation helps maintain a stable indoor temperature, reducing the workload on the heat pump and allowing it to operate more efficiently.

How Does Insulation Impact Heat Pump Efficiency?

Minimising Heat Loss:

A well-insulated building prevents heat from escaping through the walls, roof, windows, and floors. This means that the heat generated by the air source heat pump remains trapped indoors for a more extended period, reducing the need for the heat pump to operate continuously. Consequently, the heat pump consumes less energy, leading to lower heating costs and increased efficiency.

Eliminating Cold Bridges:

Cold bridges are areas within a building where heat escapes more rapidly than in other regions. These can be found around windows, doors, and poorly insulated corners. Insulating these areas effectively eliminates cold bridges, preventing heat loss and maintaining a consistent indoor temperature. By minimising cold bridges, the heat pump can maintain the desired temperature more easily, once again improving energy efficiency.

Controlling Indoor Temperature:

Insulation helps create a well-insulated envelope around the building, preventing outdoor temperatures from significantly affecting the indoor environment. With proper insulation, the building can stay warmer in winter and cooler in summer, requiring less effort from the heat pump to reach and maintain the desired temperature. This temperature control optimises the heat pump’s efficiency by reducing the workload and energy consumption.

Reducing Noise and Vibration:

Insulation not only contributes to thermal efficiency but also helps in reducing noise and vibration. Adequate insulation dampens the noise produced by the heat pump, creating a more peaceful and comfortable indoor environment.

Choosing the Right Insulation.

To maximise the efficiency of an air source heat pump, it is crucial to select the appropriate insulation for your building.

Here are a few factors to consider:

Insulation Types: Common insulation materials include fiberglass, cellulose, mineral wool, and foam boards. Each has its advantages and considerations, including thermal resistance, ease of installation, and cost. Consulting with a professional or an energy expert can help determine the most suitable insulation for your specific needs.

Building Envelope: Insulation should be installed throughout the building envelope, including walls, roofs, floors, and windows. Proper insulation in all these areas will help maintain a consistent indoor temperature, reducing the heat pump’s workload.

Insulation Thickness: The thickness of insulation is crucial in achieving optimal thermal resistance. The appropriate thickness depends on the climate zone and the desired energy efficiency level. Consulting insulation guidelines or professionals will help determine the ideal insulation thickness for your region.

What Kinds of Insulation Are Available?

Probably the first type of insulation people think of is some sort of batt, usually glass wool or rockwool. Batts are light, fluffy-looking panels of material that sit inside the frame of your home, typically either in wall spaces or in your ceiling. Batts are made of fibrous materials, and work by trapping tiny pockets of air within fibres.

Other common types of insulation include blow-in cellulose (which is easier to install if the house has already been constructed), polyurethane foam, polyester matting and reflective foil. Each type works differently to trap or repel heat, and offers different advantages and disadvantages.

Dedicated acoustic insulation can require higher density fibrous insulation or other dense materials, and is often made of polymer-based materials like rubber or glue. In residential applications though, a system’s combination of the density of the internal wall structure with the installed bulk insulation will provide significant acoustic benefits.


In the quest for energy efficiency and sustainable heating solutions, air source heat pumps have emerged as a popular choice for many consumers across the planet. While these systems are inherently efficient, their performance can be significantly enhanced by addressing another critical factors and analysing the role of insulation in maximising heat pump efficiency.

Want to start cutting your emissions and improve your EPC rating as soon as possible? Our team can provide you with air source heat pump quotes and site surveys and all you have to do is get in touch with us, and you can get a head start on the UK’s heat pump revolution.

After all, Your Green Future Starts Here!

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