Air source heat pumps are energy-efficient heating and ventilation systems that provide indoor warmth by extracting heat from outdoor air.

This guide will cover, the operation of air source heat pumps, their types, costs, benefits, and drawbacks, and how to select the best one for your home.

How do air source heat pumps operate?

Air source heat pumps use a compressor to extract heat from the air, increase its temperature, and transfer it to the homes heating system. They function identically to refrigerators in reverse.

The procedure consists of the following steps:

  • The pump absorbs heat from the ambient air.
  • The heat is transmitted to a liquid refrigerant with a low temperature.
  • The pump uses electricity to compress the liquid, thereby increasing its temperature.
  • The liquid returns to a liquid state, discharging the accumulated heat.
  • The heat is transferred to radiators, underfloor heating systems, or air circulation systems.
  • The surplus heat may be stored in a hot water cylinder for showers, bathtubs, and pipes.

Types of air source heat pumps – Further useful information

  • Air-to-water heat pumps: These pumps transfer heat from the surrounding air to your central heating system. Due to the lower heat temperature produced, they are best adapted for larger radiators and water underfloor heating systems.
  • Air-to-air heat pumps: These pumps use fans to transfer heat from the outdoor air into the residence. They require a heated air circulation system for heat distribution and cannot produce hot water.

In the summer, however, air-to-air heat pumps can function as air conditioners, supplying your home with cool air.

Advantages of air source heat pumps

  • Reduce carbon dioxide emissions: Renewable heating system significantly reduce carbon emissions.
  • Potential cost-savings on utilities: You can achieve substantial savings on your utility bills over time.
  • Compatibility with different heating methods: They can integrate seamlessly with existing heating systems, such as radiators or subsurface heating, to create a comfortable living space.

Disadvantages

  • Installation expenses could be costly: ASHP’s can significantly reduce your long-term energy costs, but the initial installation costs can be relatively high.
  • Some electrical energy is required for operation: While ASHPs extract renewable heat from the air, they still need electricity to power the compressor, fan, and circulation pumps. This means they’re not completely emissions-free unless powered by renewable electricity.
  • It may not be suitable for homes without sufficient insulation: Air source heat pumps are most efficient in well-insulated homes. In poorly insulated properties, heat may escape faster than it’s replaced, reducing efficiency and increasing running costs.

Also Check: Installation and Maintenance of Air Source Heat Pumps

Installing air source heat pumps

ASHP’s are typically installed on the side or rear of a residence, while the pump and hot water unit are installed inside. The installation of air-source heat pumps is less disruptive than that of ground-source heat pumps.

Insulation is essential for retaining the heat produced by the circulator. Heat pumps should be serviced every two to three years, with regular inspections for grill debris and other maintenance duties.

The efficiency of energy use and environmental impact

As air source heat pumps use a renewable, natural heat source, they produce less greenhouse gas emissions. The quantity of carbon dioxide (CO2) saved depends on the type of fuel being replaced. If a coal or oil boiler is replaced, CO2 savings will be greater. ASHP’s do require electricity to operate, however their environmental impact is less than that of conventional heating systems.

Energy labelling for heat pumps

Heat pumps must display an energy label indicating their energy efficiency on a scale from dark green (most efficient) to red (least efficient). All new heat pumps sold after September 26, 2015, must have an EU product label.

The installer must also construct a package label that indicates the heating systems efficiency based on its various components.

Summary

Air-source heat pumps reduce greenhouse gas emissions, lowering our carbon footprint and aiding the fight against global warming. They offer an efficient and cost-effective alternative to conventional heating methods, which could save homeowners money on their utility expenses over time.

As we transition to renewable energy sources, air source heat pumps are a great step to take to improve the energy efficiency of your property whilst moving towards renewables.