The UK air conditioning market was valued at over £480 million in 2024, with continued growth expected through 2025 as more homeowners adopt systems for both cooling and heating.
What’s particularly notable is the rate of adoption. Sales of air conditioning systems increased by over 60% between 2023 and 2024, making the UK one of the fastest-growing AC markets in Europe.
This surge isn’t happening in isolation. This growth is being driven by warmer summers, sustained high energy costs following the energy crisis, and growing awareness of air-to-air heat pumps as a viable heating solution.
Taken together, these trends show that air conditioning is no longer just a seasonal upgrade.
It’s increasingly being viewed as a core part of modern home heating and cooling strategy in the UK.
What Does “Heating with AC” Actually Mean?
Today’s air conditioning systems are air-to-air heat pumps, designed to both cool and heat your home using the same core technology.
Unlike gas boilers, which burn fuel to generate heat, these systems transfer existing heat energy from one place to another.
Even when it feels cold outside, there is still thermal energy present in the air.
Air-to-air heat pumps work sort of like a fridge. Here’s how it works in practice:
- The outdoor unit absorbs heat from the outside air using a refrigerant
- This refrigerant is compressed, which raises its temperature significantly
- The heated refrigerant is then circulated to the indoor unit
- A fan blows air across the system, releasing that heat into your room
This process is continuous and highly controlled, allowing the system to maintain a steady indoor temperature without the stop-start cycles typical of traditional heating.
Because the system moves heat rather than creates it, it requires far less energy to operate.
That’s why modern AC units can deliver multiple units of heat for every unit of electricity used.
The result is a highly efficient, electrically powered heating solution that can warm your home effectively, even during typical UK winter conditions, while also offering cooling in summer.
Is Heating Via An AC Unit Efficient?
In the simplest of terms, yes.
Compared to traditional heating systems, which create heat by burning a fuel source, an AC system moves it around.
This means an AC system can operate very efficiently for both heating and cooling.
Efficiency is typically measured using COP (Coefficient of Performance).
Jargon Buster: COP (Coefficient of Performance) A metric used to measure the efficiency of heat pumps and air conditioning systems. A COP of 3 or 4 means the unit produces 3 to 4 units of heat for every 1 unit of electricity it consumes.
A modern AC unit can deliver:
- 3 to 4 units of heat for every 1 unit of electricity used
- Compared to gas boilers, which are typically capped at around 90–94% efficiency
This means you’re getting significantly more usable heat for the energy you pay for.
In practice, that translates into lower running costs, especially as the UK continues shifting towards electrification and away from fossil fuels.
However, it should be noted that how efficiently an AC heats your home depends on a few factors in your home.
What Makes A Home Well-Suited To Heating With AC?
Heating with AC can be highly efficient, but performance depends on the property itself.
Some homes are naturally better suited to this type of heating than others.
Here are the key factors that make a home ideal:
Good Insulation
Insulation is the foundation of efficient heating. Homes with a loft and cavity wall insulation, as well as double or triple glazing, retain heat far more effectively.
Because AC systems deliver steady, lower-intensity heat, well-insulated spaces stay warm longer and require less energy to maintain temperature.
Airtightness And Reduced Draughts
Even a powerful system will struggle if heat is constantly escaping.
As a result, windows and doors should be well sealed to reduce draughts, improve airtightness, and prevent unnecessary heat loss.
All these elements allow AC systems to operate efficiently without constantly compensating for heat loss.
Open-Plan Or Well-Connected Spaces
Air conditioning relies on circulating warm air throughout a space.
This allows homes with open-plan layouts or good airflow between rooms to distribute heat more evenly, rather than having it become trapped in one area.
All this helps the system heat spaces more consistently, reducing the need for higher output or multiple units.
Room-By-Room Heating Needs
One of the biggest advantages of AC is control.
If your home isn’t occupied evenly throughout the day, there’s little benefit in heating every room at once.
Air conditioning allows you to focus on the spaces you actually use, whether that’s a home office during the day or a living room in the evening.
This approach reduces wasted energy and makes heating feel far more responsive to your routine.
Modern Electrical Capacity
Because air conditioning systems run on electricity, your home needs to be able to support them.
Most modern properties already have the capacity required, but older homes may need minor upgrades to accommodate installation.
A suitable electrical setup ensures the system runs smoothly, without interruptions or performance limitations.
Reasonable Heat Demand
Some homes simply require less energy to stay warm.
Properties that have been built or upgraded to modern standards tend to lose less heat and maintain temperature more easily.
This includes newer homes, renovated properties, and those with stronger EPC ratings.
In these environments, air conditioning systems can operate more efficiently, maintaining a comfortable temperature without needing to work as hard.
A Smart Backup For Your Existing Heating
Heating with AC doesn’t require replacing your boiler.
In fact, in many homes, it works best as a hybrid approach, which means using AC for day-to-day, targeted heating, while resorting to your boiler during colder spells or for whole-home heating
By taking this simple step, homeowners can reduce reliance on gas, lower wear on their boilers, and gain flexibility as energy prices fluctuate.
If you’re considering installing an air conditioning system, getting the setup right is critical.
Why Installation Matters More Than Ever
Even the most advanced system will underperform if it isn’t properly specified.
In practical terms, installers assess factors such as room size, layout, insulation levels, heat loss, and how sunlight enters the space to determine the appropriate system capacity.
This ensures the system is correctly matched to your home.
An Engineer’s View
Sizing an air conditioning unit correctly is crucial for winter heating. If it’s too small, it will run constantly and drive up your energy bills, but if it’s too large, it will cycle on and off inefficiently. – Rhys Powell, F Gas Engineer
If a unit is too small, it will struggle to maintain temperature.
If it’s too large, it can cycle inefficiently and waste energy.
Getting this balance right is what allows the system to run efficiently, maintain consistent comfort, and deliver the performance you expect over the long term.
This level of precision is becoming increasingly important as the UK moves towards low-carbon heating.
Energy policy, rising costs, and tighter efficiency standards are all pushing homes away from gas and towards electrified solutions.
Air conditioning systems that can heat your home sit right at the centre of that shift.
When properly installed, they offer a practical way to reduce energy use while maintaining reliable, year-round comfort.
If you’re ready to heat and cool your home the smarter way, who can assist?
Ready to Heat (and Cool) Your Home Smarter?
If you’re looking for a more flexible, efficient way to heat your home, air conditioning is no longer just an add-on.
It’s a serious alternative.
Take WarmZilla’s air-conditioning survey, answer a few easy questions, and you will be presented with perfect options for your home.
If you accept our quote, we can send someone to your home within 48 hours to install it.
Frequently Ask Questions
Can Air Conditioning Really Heat A House In Winter?
Yes. Modern AC systems are air-to-air heat pumps designed to provide efficient heating even in cold temperatures typical of UK winters.
Is Heating With AC Cheaper Than Gas?
In many cases, yes, especially in well-insulated homes or when heating specific rooms rather than the whole house.
Do I Need To Replace My Boiler To Use AC Heating?
No. Many homeowners use AC alongside their existing boiler for a flexible, hybrid heating approach.
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