When we say air conditioning can heat your home as well as cool it, one of the first questions we get is: “But how does air conditioning actually heat your house up?”
It’s a fair question. Most of us associate air conditioning with a lovely cool hotel room on holiday – not keeping the house cosy on a cold October morning. But modern air conditioning systems are actually air-to-air heat pumps, meaning they can work in both directions: cooling your home in summer and heating it during the colder months.
So, how does it work?
Think of it like a fridge… in reverse
Your fridge doesn’t actually create cold. Instead, it takes heat from inside the fridge and transfers it into the room – which is why the back of a fridge feels warm.An air conditioning system uses a similar process: during summer, the system absorbs heat from inside your property and transfers it outside.
When you switch it to heating mode, the process reverses. The outdoor unit absorbs heat energy from the outside air. Refrigerant and a compressor are then used to raise its temperature before that heat is transferred indoors, and the indoor unit circulates the warm air around your room.
And yes – there is still usable heat energy in the outside air even when it feels cold to us.
So, it’s not just an electric heater?
No – and this is where things get interesting. A traditional electric panel heater, fan heater or plug-in radiator converts electricity directly into heat. Broadly speaking, 1kWh of electricity produces around 1kWh of heat.
A heat pump works differently because it uses electricity primarily to move existing heat from one place to another. This means an efficient air-to-air heat pump can deliver several units of heat for every unit of electricity it consumes, depending on the system and conditions.
That’s why air conditioning can be particularly attractive for households currently relying on direct electric heating.
What actually happens when you turn it on?
Imagine you’ve walked into your home office on a chilly October morning.
You pick up the remote – or open the app on a Wi-Fi-enabled system – and set the temperature to 21°C. The system then draws heat energy from the outside air, increases its temperature through the refrigeration cycle and transfers that heat inside. The indoor unit distributes warm air around the room until your chosen temperature is reached.
Modern inverter-driven systems can then reduce their output rather than constantly switching between full power and off, helping to maintain a comfortable temperature efficiently. The result is fast, controllable heating exactly where you need it.
But does it work when it’s freezing outside?
Yes. Modern air-to-air heat pumps are designed to continue operating at temperatures below 0°C, although efficiency and heating output can reduce as outdoor temperatures fall.
That’s one of the reasons why choosing the right system and having it correctly sized is so important. At Carter Renewables, we can assess the size of your space, its heating requirements and how you plan to use the system before recommending an appropriate unit.
Where does it work best?
Air-to-air heating can be particularly useful for:
- Home offices and garden rooms
- Extensions and loft conversions
- Bedrooms
- Open-plan living spaces
- Properties using electric panel heaters
- Rooms that are difficult or expensive to connect to an existing central heating system
And there’s another fairly significant benefit: the same unit cools the room in summer. Instead of installing separate systems for winter heating and summer cooling, you’ve got year-round temperature control from one system.
What about running costs?
If you’re replacing direct electric heating, an efficient air-to-air heat pump has the potential to use substantially less electricity to provide the same amount of useful heat.
Of course, there’s no single figure that applies to every property: running costs will depend on your electricity tariff, the efficiency and size of your system, outdoor temperatures, insulation, your chosen room temperature and how often you use it.
So we’d always be wary of anyone promising an exact saving without knowing anything about your home. However, if you’re currently heating a room with electric panel heaters or plug-in radiators, it’s certainly worth exploring whether an air-to-air heat pump could be a more efficient alternative.
Air conditioning isn’t just for summer
Perhaps we need to stop thinking of these systems as simply air conditioning – they’re effectively year-round climate control. The same unit that keeps your bedroom cool during a July heatwave can keep it warm on a freezing January morning.
So, if you’ve previously thought: “I’d love air conditioning, but we only get a few really hot weeks each year…”
That’s only half the story. With the right system, you’re investing in heating throughout autumn and winter AND cooling throughout spring and summer.
Thinking about air conditioning for your home?
Whether you’re looking to heat a home office, replace inefficient electric heaters or simply get ahead of next summer, Carter Renewables can help you find the right system for your property.
And with installations available throughout the colder months, October might actually be the perfect time to start thinking about air conditioning.
Get in touch with the Carter Renewables team to discuss your home and arrange a quote.