Heating, not hot water
Air-to-air units heat the air in your rooms. They don't heat water, so you'll still need your boiler or a cylinder for hot water. Many people keep their radiators as a backup.
Heat your home with air conditioning
Modern Mitsubishi Electric air conditioning heats as well as cools. As an air-to-air heat pump, it moves heat from the outside air into your rooms, giving you around 4 to 5 units of heat for every unit of electricity it uses.
- F-Gas certifiedF-Gas Register FGAS2004172
- Fully insuredPublic liability cover
- Established 2014Registered UK company
- ECS-carded electricianJIB Site Technician grade
How air conditioning heats
Heat from the outside air
The outdoor unit draws heat from outside air, even when it's cold. Popular Mitsubishi Electric models keep heating down to −15°C.
4–5 units of heat per unit used
Seasonal efficiency (SCOP) for Mitsubishi Electric wall units is typically around 4.5 to 5.2, compared with 1 for plug-in or panel heaters.
Warm rooms, fast
Heats the rooms you use, when you use them, with optional app control. The same unit cools you down in summer.
What does a unit of heat cost?
Comparing the cost of producing 1 kWh of heat, using current average energy prices:
Electric heaters100% efficient
26.3p
Gas boiler90% efficient
8.9p
Mitsubishi Electric air-to-airSCOP 4.5, conservative example
5.8p
Mitsubishi Electric MSZ-LN25SCOP 5.2
5.1p
Based on Ofgem price cap averages for 1 October to 31 December 2026, paying by direct debit: electricity 26.32p/kWh, gas 7.97p/kWh (Ofgem). Electricity currently has no VAT until 31 March 2027. Unit rates only; standing charges are not included. Gas boiler assumed 90% efficient. MSZ-LN25 SCOP from its Eurovent certification. SCOP is a standard seasonal rating; real running costs depend on your home's insulation, the weather, the installation and how you use the system. Energy prices change every quarter.
Good to know
Where it works best
Living rooms, bedrooms, extensions, conservatories, garden rooms and home offices. Also homes on electric heating, or alongside gas to use the boiler less.
No government grant
Air-to-air heat pumps aren't covered by the Boiler Upgrade Scheme, which is for systems that heat water. Running costs fall further if you have solar panels.
Ask for a running-cost comparison
Every home is different. Send us a few details and we'll recommend the right Mitsubishi Electric unit and give you a guide price, with an honest view of how running costs compare with your current heating.
What to send:
- The rooms you want to heat, with sizes (length × width)
- How you heat them now (gas, electric heaters, oil or LPG)
- Photos of the inside wall for the indoor unit and the outside area for the outdoor unit
- Your electricity tariff, and whether you have solar panels, if you know
- Send details and photos on WhatsApp
- Get a guide price and running-cost comparison
- We survey and confirm your quote before any work starts
Prefer email? Use the enquiry form. Estimates from photos are a guide and are confirmed after a survey.
Why we fit Mitsubishi Electric
We mainly install Mitsubishi Electric split systems for their efficiency, reliability and quiet operation, with heating ratings up to A+++. Every system is installed by our F-Gas certified company (FGAS2004172), with the electrical connection done by our own ECS-carded electrician. See how an installation works.
Warmer this winter, cooler next summer
One system for both, across Derby and the East Midlands.