How many rooms?
One system can cool and heat more than one room — a single outdoor unit with up to 5 indoor units (a multi-split system).
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Instant quote · MK18 and surrounding area
Tell us your room size and get a live installed price — no phone call needed to get started. Single-room installations start at £1,195 on our limited-time back-to-back offer (standard single rooms from £1,384), including the outdoor unit, indoor unit, copper pipework, materials and fitting, with 0% VAT applied automatically.
The calculator below prices a real Haier system, not a ballpark. It works out the kW size your room actually needs from its dimensions, selects the matching outdoor unit, adds installation and materials, and shows you the itemised total before you speak to anyone.
One system can cool and heat more than one room — a single outdoor unit with up to 5 indoor units (a multi-split system).
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Rough measurements are fine — we'll confirm exact sizing on survey. This gives you an instant guide price.
We install Haier air conditioning — fully installed and backed by a 6-year warranty. Price shown is for your recommended 3.5 kW size.
Haier
One of the world's largest AC manufacturers. Wi-Fi app control and 56°C sterilisation included as standard, 6-year warranty.
For a single room where the outdoor unit can go on the other side of the same wall — a simple “back-to-back” install with a pipe run of up to 5 m. Includes the Haier 2.5 kW heat pump, installation, mounting and, where it's a simple job, the outdoor power connection. Limited to one room per household — it can’t be used for multi-room systems. Offer details
This helps us confirm your area and arrange a survey — it doesn't affect the price shown.
Trunking hides the pipework running from indoor to outdoor unit. This isn't included in the guide price below — if your property needs it, we'll quote it separately as an option once we've seen the pipe run at survey.
Most homes need a dedicated fused spur near the outdoor unit. If you don't already have a suitable outdoor power socket, we can install one — electrical work is charged from £175.00, subject to survey.
Installation includes supplying and running the copper pipe and the condensate drain pipe. If the pipe run has to go uphill — commonly into a loft before heading outside — a condensate pump is needed to lift the water. We fit the Aspen Silent+ Mini Lime, a near-silent pump ideal for bedrooms and other noise-sensitive rooms. Fitting also includes a one-way (non-return) valve.
Wall-mounted units sit on galvanised steel brackets fixed to the wall. Floor-standing units sit on anti-vibration rubber feet or blocks to reduce noise and protect the surface underneath.
Wall mounted
Galvanised steel wall bracket kit, keeps the unit off the ground and out of the way.
Floor standing
Anti-vibration rubber feet or blocks, sits at ground level on a flat surface.
Your quote
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Sizing is the part most quotes get wrong. Undersize the unit and it runs flat out and never reaches temperature; oversize it and it short-cycles, which costs more to run and wears the compressor out early.
The calculator above sizes on room volume rather than floor area, because a tall room needs more capacity than a standard-height one of the same footprint. It allows 0.065 kW per cubic metre, then steps up to the next unit in the Haier range. For a typical 2.4 m ceiling that works out as follows.
| Room size | Typical room | Unit size |
|---|---|---|
| Up to 16 m² | Bedroom, home office | 2.5 kW |
| 16–22 m² | Master bedroom, small lounge | 3.5 kW |
| 22–32 m² | Living room, garden room | 5.0 kW |
| 32–38 m² | Large living room | 6.0 kW |
| 38–45 m² | Open-plan kitchen-diner | 7.1 kW |
Enter your actual dimensions above and the calculator does this for you, including picking the right multi-split outdoor unit if you're doing more than one room. Rooms with large south-facing glazing, a top-floor room under an uninsulated roof, or a kitchen with significant heat gain may need the next size up — we confirm this on survey.
A single-room split system installed by an F-Gas certified engineer starts at £1,195 with 0% VAT on our limited-time back-to-back offer (other single-room installs from £1,384). That covers the indoor unit, the outdoor unit, interconnecting pipework, the electrical connection and full commissioning. Multi-room systems share one outdoor unit, so the cost per room comes down as you add rooms — the calculator above prices this exactly.
Between roughly 11.8p and 51.9p an hour depending on unit size and whether you're cooling or heating, based on the 26.32p per kWh Ofgem cap. A 2.5 kW bedroom unit cooling on a warm evening is at the bottom of that range. Full breakdown on our running costs page.
It's a real itemised guide price, not a broad estimate range — it prices the specific Haier units your rooms need at our actual installed rates. We confirm it at a free, no-obligation survey before any work starts. If the survey finds something the calculator couldn't know about, such as a difficult pipe route or a consumer unit that needs attention, we tell you before you commit.
Not on a qualifying domestic installation. Reversible heat pump air conditioning is classed as an energy-saving material and carries 0% VAT until 31 March 2027. The calculator applies this automatically. See what the relief covers.