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Everything you need to know about Heat Pumps

Heat pumps are highly efficient devices that can both heat and cool spaces by transferring heat from one location to another.

They work on the principle of moving heat energy from a lower temperature source to a higher temperature sink using a small amount of external energy. Here's everything you need to know about heat pumps:

How Heat Pumps Work:

Heat pumps extract heat from the air, ground, or water, and transfer it to the desired space. They consist of four main components: an evaporator, a compressor, a condenser, and an expansion valve. The process involves:

  • Evaporator: The heat pump absorbs heat from the source (air, ground, or water) through the evaporator coil using a refrigerant.

  • Compressor: The refrigerant is compressed, increasing its temperature and pressure.

  • Condenser: The hot refrigerant releases heat to the space being heated as it condenses back into a liquid.

  • Expansion Valve: The pressure of the refrigerant is reduced through the expansion valve, and it returns to the evaporator to start the cycle again.

Heating Mode:

In heating mode, the heat pump extracts heat from the outside environment (air, ground, or water) and transfers it indoors. Even in cold weather, heat pumps can extract heat energy from the air or ground.

Cooling Mode:

Heat pumps can also work in reverse to provide cooling. They extract heat from the indoor space and release it outside, thus cooling the interior.

Types of Heat Pumps:

  • Air-Source Heat Pumps (ASHP): These extract heat from the ambient air and are the most common type of heat pumps. They can be used for both heating and cooling.

  • Ground-Source Heat Pumps (GSHP) or Geothermal Heat Pumps: These extract heat from the ground through underground pipes and are highly efficient. They can provide heating, cooling, and even supply hot water.

  • Water-Source Heat Pumps: These extract heat from a water source such as a lake or pond.


Heat pumps are known for their high energy efficiency. They can provide up to three units of heating or cooling for every unit of electricity consumed, making them more efficient than traditional heating or cooling systems.

Benefits of Heat Pumps:

  • Energy Efficiency: Heat pumps can significantly reduce energy consumption compared to conventional heating and cooling systems, leading to lower utility bills.

  • Environmentally Friendly: Heat pumps produce fewer greenhouse gas emissions than traditional heating and cooling systems, contributing to a greener environment.

  • Versatility: Heat pumps can both heat and cool, providing year-round comfort.

  • Durability and Longevity: With proper maintenance, heat pumps can last for many years.

  • Safety: Heat pumps don't involve combustion, reducing the risk of carbon monoxide poisoning or gas leaks.


  • Climate: The effectiveness of an air-source heat pump can be influenced by the local climate, as colder temperatures reduce their efficiency. However, advances in technology have made heat pumps more suitable for colder climates.

  • Installation: Proper sizing and installation are crucial for optimal performance. Professional installation is recommended.

  • Cost: Heat pumps may have a higher upfront cost compared to traditional systems, but their energy savings can offset the initial investment over time.

Remember that specific details and requirements may vary depending on the type and model of the heat pump, as well as regional factors. Consulting with a professional HVAC (heating, ventilation, and air conditioning) technician or installer like RES Devon is advisable when considering a heat pump for your specific needs.

Our project managers will talk you through all of the things to consider when planning your project with you, and our installation team will handover to you with a tutorial on how to use the system and make the most our of your new energy saving renewable technologoy.

More and more customers are inspired by the energy crisis to make the most of the governemnts Boiler Upgrade Scheme.

As well as being envirvonemntally cleaner, replacing your old boiler with a renewable source of heating, such as an Air Source or Ground Source Heatpump, will improve your homes energy consumption and save you money in the long term.

The BUS (Boiler Upgrade Scheme) is the perfect opportunity to save money whilst transforming your property into a more energy efficeint home. Contratry to the name, you do not need to be replacing a boiler, and you can even be a self build new home, as long as you are leaving behind fossil fuels for a renewable solution, you will be eligible for the grant.

To find out more about making the most of the BUS contact us today for a no obligation chat, where we will be able to give you cost predicitons on what your property could save being heated by an Air Source Heat Pump or Ground Source Heat Pump.


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