With gas and electricity prices continuing to rise, more UK homeowners are looking at alternatives to traditional gas central heating. A 2022 survey by the UK Department for Business, Energy and Industrial Strategy found that 78% of respondents used gas central heating - but that figure is starting to shift as heat pump technology becomes more accessible and government grants make the switch more affordable.
One option that often gets overlooked - or dismissed based on misconceptions - is using air conditioning to heat your home. Here is why it deserves a closer look.
Can an Air Conditioning System Heat Your Home?
Many people buy air conditioners purely for summer cooling and do not realise they already own a heating system. Most modern air conditioning units are reverse-cycle systems, meaning they can heat as well as cool. If your unit has a heat mode button on the controller, it almost certainly functions as a heat pump.
To confirm: switch to heat mode and check whether the outdoor unit activates. If it does, you have a fully functional heat pump system. If there is no heat mode option, your unit is cooling-only - but in many cases a heat pump component can be added to convert it.
How Does Air Conditioning Heating Work?
A standard electric heater converts 1kW of electricity into 1kW of heat - a 1:1 ratio. A modern reverse-cycle air conditioning system works differently. Rather than generating heat, it moves heat from outside air into your home using a refrigerant cycle. High-performing systems can deliver up to 6kW of heat output for every 1kW of electricity consumed - a ratio that no gas boiler, oil heater, or electric fire can match.
This efficiency advantage is why heat pumps are central to the UK government decarbonisation strategy, with grants available under the Boiler Upgrade Scheme to help offset installation costs.
Heat Pumps vs Gas Central Heating
Gas central heating heats quickly and to high temperatures, but it is expensive to run and produces carbon emissions. Heat pumps run at lower flow temperatures and need to run for longer periods to heat a space - but they do so at a fraction of the running cost per unit of heat delivered, particularly in a well-insulated home.
Good insulation is essential for heat pump efficiency. The better your building envelope, the lower the flow temperature required and the more efficiently the system runs. Well-insulated refrigerant pipework between indoor and outdoor units also reduces heat loss - Armaflex EVO pipe insulation and K-FLEX ST insulation tape are suitable options for this.
Additional Benefits of Air Conditioning Heating
- Even heat distribution: Air conditioning systems distribute heat more evenly across a room than radiators or free-standing heaters, which tend to create hot and cold spots.
- Air purification: The system filters air as it circulates, removing allergens and improving indoor air quality. See our guide on air conditioning and health for more detail.
- No combustion: No naked flames, no combustion gases, no carbon monoxide risk.
- Year-round use: The same system cools in summer and heats in winter, making it a genuinely versatile investment.
- Long lifespan: Well-maintained systems can last 15-20 years with relatively few moving parts.
Is Air Conditioning Heating Right for Your Home?
Air conditioning heating works best in well-insulated properties. If your home loses heat quickly through walls, windows, or the roof, the system will have to work harder and the efficiency advantage narrows. Pairing an HVAC system with a solar PV installation takes the efficiency case further - generating your own electricity to run the heat pump removes the dependency on grid energy prices entirely.
For running cost tips that apply to both heating and cooling modes, see our complete guide to reducing air conditioning running costs.
Frequently Asked Questions
Can all air conditioners heat as well as cool?
No - older or basic units are cooling-only. Most modern split systems are reverse-cycle and include a heat mode. Check your controller for a heat or sun symbol, or check whether the outdoor unit activates when heat mode is selected.
Is heating with air conditioning cheaper than gas?
In terms of energy efficiency, yes - modern heat pump systems deliver significantly more heat per unit of electricity than gas boilers deliver per unit of gas. Whether it is cheaper in cash terms depends on current gas and electricity tariffs and your home insulation level.
Are there grants available for heat pump installation in the UK?
Yes - the Boiler Upgrade Scheme offers grants for eligible properties. Check the current scheme details on the GOV.UK website as grant amounts and eligibility criteria are updated periodically.
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