How Much Does Air Conditioning Cost To Run In The High Peak, Stockport And Greater Manchester?

The Sum Behind The Number

For the example we use a Mitsubishi Electric pair, the MSZ-AY25VGKP indoor unit with the MUZ-AY25VG outdoor unit, because Mitsubishi publishes the figures. Its product sheet gives a cooling output of 2.5 kW for 0.60 kW of electricity, and a heating output of 3.2 kW for 0.78 kW (Mitsubishi Electric product fiche, 14 May 2024).

The price comes from Ofgem’s cap for 1 October to 31 December 2026: 26.32p per kWh of electricity, the Great Britain average on direct debit (Ofgem, checked 9 October 2026). Put together:

A Hot Spell, Worked Through

That is the rated-output figure. The first half hour of pulling a hot room down can cost a little more, and once the room is down to temperature the compressor slows and draws less, so a settled evening costs below it. Leave it on all night and eight hours at 0.60 kW is 4.8 kWh, about £1.26.

We size the unit to the room so it can tick over once the room is cool, which is what keeps a real summer under the rated sum.

How The Hourly Figure Moves Through A Day

An inverter unit spends little of its time at the rated point. The same Mitsubishi sheet gives a cooling range of 0.9 to 3.4 kW: pulling a hot room down, it can run above 2.5 kW and draw more than 0.60 kW for a while, and once the room reaches temperature the compressor slows down and draws less. For much of a summer evening it ticks over below those hourly figures.

The energy label captures that with a seasonal figure. The rules behind it assume a unit delivers its full cooling load for the equivalent of 350 hours a year, and its heating load for 1,400 hours in an average climate (Regulation (EU) No 206/2012, Annex II, Table 4, as retained in UK law). On that basis the label for this pair shows:

The sheet itself notes that real use depends on how and where the unit runs, so treat those as a standard yardstick, not a promise for your house.

Reading The Energy Label Before You Choose

A split system up to 12 kW comes with an energy label, and four lines on it let you compare two units before either goes on your wall (Regulation (EU) No 626/2011, as retained in UK law):

Two units with the same cooling output can sit a long way apart on SEER, and the higher one costs less for every hour it runs. We pick from the label as well as the size, and the fixed quote names the model so you can read its label for yourself.

Heating With It Costs Less Per Unit Than Gas

Air-to-air only heats the rooms with an indoor unit and does no hot water, so it won’t replace a whole heating system on its own terms. For a home office, a loft room or a cold extension, it can heat that one room for less per unit than a gas boiler.

Against A Plug-In Electric Heater

That gap is the case for a split unit in a room that runs on a fan heater today: a garden office in Hayfield, a cold extension in Marple, a loft room in New Mills. The unit then cools the same room in summer.

What Pushes Your Running Cost Up

The example assumes a unit matched to its room. Real bills drift from it for a handful of reasons:

Several Rooms, Cheaper Hours And Solar

Running cost adds up room by room. Each room you cool adds heat for the outdoor unit to move, so three bedrooms cooled for the same hours cost about three times one, and a room with its unit switched off adds nothing. On a multi-split one outdoor unit does that work for every room, and the bill follows the rooms in use.

A time-of-use tariff can bring the price per unit down for the hours it covers, and many of those cheaper hours fall overnight, when a bedroom unit is running anyway. Run the sum above with your own tariff’s rate in place of 26.32p.

Panels on the roof change it again. A split system cools hardest on sunny afternoons, when panels make the most electricity, so much of that cooling can run on your own output. Our solar battery guide covers what panels and a battery would do for a house in the High Peak or Greater Manchester.

Running Costs: Fixed Split Against Portable

A fixed system costs more to buy. Supplied and installed in a home, though, it carries 0% VAT until 31 March 2027, where a portable unit or supply-only kit is standard-rated (HMRC, VAT Notice 708/6, sections 2.3 and 2.15). It also comes with our two-year workmanship guarantee on the install, which a box from a shop doesn’t.

Keeping The Figure Down Year After Year

A split system that runs to its numbers in year one can drift by year five, drawing more power for the same cooling. An annual service puts three things right:

Our Air Conditioning Care Plans start at £35 a month including VAT for one indoor and one outdoor unit, with the annual service and priority booking on every tier. Each extra indoor unit adds £3, £5 or £7.50 a month depending on the tier, so a three-room system costs a known amount to look after.

What The Survey Adds To The Sum

The numbers above come from one product sheet and one price cap. Your room brings its own: the floor area, the glazing and the way the sun hits it, the insulation in the roof, the hours you use it. Lewis measures those for each room on your list, from a loft bedroom in Hayfield to an office in Stockport, and picks a unit sized to the room.

The office books the survey at a time that suits you, a single room takes about a day to fit, and the team doing the work is rated 4.8 on Google from 33 reviews.

Install day, from the first hole in the wall to handover, is on our air conditioning installation page.