Air conditioning is one of the few home improvements where the tax treatment genuinely changes the arithmetic, and one of the most widely misdescribed. Banners promising 0% VAT on air conditioning are easy to find. The relief they point at is real, it is set out in HMRC's own published guidance, and it currently runs to a fixed end date — but it is a relief on a particular kind of supply, not a blanket exemption for a product category. A great deal of air conditioning work in the UK is standard-rated, and some of it always will be.
What follows is what the law says: which supplies fall inside the zero rate, the four conditions that decide it, what sits outside, and what is scheduled to happen on 1 April 2027. The tax sources throughout are HMRC's VAT Notice 708/6 (VAT on energy-saving materials and heating equipment) and the HMRC internal manual pages VENSAV2083 and VENSAV3080. The planning and refrigerant points below are sourced separately.
What the zero rate actually applies to
VAT Notice 708/6 states at section 2.1 that a zero rate applies to the installation of certain specified energy-saving materials from 1 May 2023 to 31 March 2027, and that from 1 April 2027 onwards these revert to the reduced rate of VAT of 5%. Air source heat pumps are one of the specified materials on that list.
Two things follow. First, this is not an air conditioning relief. It is a general energy-saving materials relief covering a defined list of items, and it is the same provision under which domestic solar panel installations and battery storage installations currently carry the zero rate. Air conditioning reaches the relief only by qualifying as an air source heat pump, and only when it does.
Second, it is a relief on installation. The rate attaches to the work of fitting a qualifying material into a building, not to the equipment sitting on a shelf.
The four conditions that actually decide it
Whether an air conditioning installation is zero-rated comes down to four separate tests. All four have to be satisfied together. Failing any one of them puts the supply back to the standard rate of 20%.
| Condition | What it means in practice | Source |
|---|---|---|
| Permanently fixed | Section 2.15 of the notice limits the relief to air source heat pumps that are “permanently fixed and are not portable or moveable”. A wall-mounted indoor head, an outdoor unit bolted to a wall or frame, and refrigerant pipework through the fabric describe a fixed system. A unit on castors venting through a part-open window does not. | 708/6 s.2.15 |
| Capable of providing heating | HMRC manual guidance requires the unit to provide space heating, water heating, or both. The ability to cool is not what earns the relief — the ability to heat is. A reversible system that heats in winter and cools in summer meets this test; a machine built only to reject heat does not. | VENSAV3080 |
| Installed in residential accommodation | Section 2.7 applies the relief to energy-saving materials installed in residential accommodation or, from 1 February 2024, a building intended for use solely for a relevant charitable purpose, and section 2.21 sets out what counts as residential accommodation. An installation in ordinary commercial premises — an office, a shop unit, a server room — is standard-rated. | 708/6 s.2.7, s.2.21 |
| Installed, not merely supplied | Section 2.3 puts it two ways: the relief applies to the service of installing a qualifying material, and it applies to the material itself when supplied by the person who installs it. What falls outside is a sale with no installation — section 2.3 states that where energy-saving materials are supplied without being installed the supply is standard-rated, and that a retailer’s sale is always standard-rated. | 708/6 s.2.3 |
Why the heating capability is the hinge
Of the four conditions, the second is the one that surprises people: it is the reason a machine most householders call air conditioning is treated in tax law as a heat pump. HMRC states its position plainly in the notice itself, at section 2.15: “HMRC's understanding is that most air conditioning units are air source heat pumps.” The passage is careful, and the care matters. It says most, not all, and the very next sentence reserves the point that in cases of doubt, deciding if any particular product is to be treated as an air source heat pump will depend on the facts of each case.
A modern split system moves heat rather than making it, and the refrigeration circuit can be run in either direction. Section 2.15 describes exactly that: fixed air source heat pumps can be reversed so that they draw heat from inside a building, providing cooling in summer as well as indoor heating in colder periods. One machine, two directions of travel, and the relief is written around the heating direction.
So the qualifying question is never really about how good the cooling is. It is about whether the equipment can heat at all. That distinction is explored in air conditioning or air-to-air heat pump, and it is the fault line most advertising walks straight over.
Tax is not the only regime drawn along that line. In England, the permitted development class covering air source heat pumps — Schedule 2, Part 14, Class G of the Town and Country Planning (General Permitted Development) (England) Order 2015, as amended with effect from 29 May 2025 — carries a condition that the pump is not used solely for the purpose of cooling. A cooling-only machine therefore falls outside two separate legal regimes at once, for the same underlying reason.
What does not qualify
The exclusions are where real invoices land.
| Supply | VAT treatment | Which condition it fails |
|---|---|---|
| Fixed cooling-only system | Standard-rated | No heating capability |
| Portable or plug-in unit | Standard-rated | Not permanently fixed |
| Equipment supplied without installation | Standard-rated | Not a supply-and-install |
| Servicing, maintenance and repair | Standard-rated | The relief covers installation only |
| Mechanical ventilation with heat recovery | Standard-rated | Expressly excluded from the relief |
| Installation in ordinary commercial premises | Standard-rated | Not residential accommodation |
Portable units fail on the first test, and tax is not their only problem. Separately from VAT, the GB fluorinated gas rules already prohibit placing new movable air conditioning equipment using HFC refrigerants with a global warming potential above 150 on the market. The various formats, and where each one genuinely fits, are compared in types of air conditioning explained.
Servicing and repair sit outside the relief
This is the trap that catches households a year or two later. The zero rate in section 2 of the notice is a rate on installation. It does not extend to repair, maintenance or servicing. An annual service visit, a filter and coil clean, a refrigerant top-up following a leak repair, or a callout to a fault will ordinarily carry standard-rate VAT even though the system itself was zero-rated when it went in.
An invoice showing 0% on the original installation and 20% on the following year's service is not an error, and not a change of mind. It is the correct application of two different rules to two different supplies. Who is legally permitted to carry out that refrigerant work in the first place is a separate question, covered in who can legally install air conditioning.
Contracts that mix qualifying and non-qualifying work
Air conditioning rarely arrives on its own. It often comes alongside a consumer unit upgrade, additional circuits, making good, or a second unit somewhere the four conditions are not met. Where a single contract covers a qualifying installation and work that is not a specified energy-saving material, the treatment of the overall supply is a question of how that supply is analysed.
There is no safe one-line answer to that on a web page. Whether a mixed contract is treated as a single supply taking one rate, or as separate supplies each taking its own, turns on how the particular contract is structured — and it is properly a matter for the accountant preparing the invoice. What can be said is the boundary itself: the zero rate attaches to the installation of a qualifying energy-saving material, and it does not spread outwards to cover unrelated work written on the same piece of paper.
How the rate reaches the householder
A VAT rate is not a grant and not a discount scheme. There is no application, no scheme membership and no voucher. The rate is applied by the person making the supply at the point the invoice is raised, and it either applies to that supply or it does not.
What is scheduled to happen on 1 April 2027
Section 2.1 of Notice 708/6 gives the zero rate as running to 31 March 2027 and states that from 1 April 2027 onwards these installations revert to the reduced rate of VAT of 5%. VENSAV2083 records the same reversion for air source heat pumps. As at September 2026, no extension has been announced and the notice carries no amendment altering that.
What changes on 1 April 2027 is the rate, not the conditions. A cooling-only system, a portable unit, a supply-only sale and a service visit are standard-rated on both sides of that date. And a qualifying installation does not fall off a cliff into the standard rate — it moves from the zero rate to the reduced rate of 5%.
It is a scheduled change in tax law, not a countdown. A system that is not right for a property does not become right because of a rate, and a specification that is wrong on heat gain, siting or electrical capacity is wrong at any rate of VAT. Sizing is a calculation in its own right, set out in what size air conditioning do I need, and it does not move for tax reasons.
How to test a VAT claim you read
Any claim about air conditioning and VAT can be checked against the four conditions. Is the system permanently fixed? Can it heat as well as cool? Is it going into residential accommodation? And does the supply include the installation, rather than being equipment sold on its own? Where all four answers are yes, the zero rate is in point until 31 March 2027. Where any one is no, it is not.
Two patterns fail that test on sight. The first is the unconditioned claim — a bare statement that air conditioning is VAT-free, with no mention of fixing, heating capability, the type of building or supply-and-install. That is broader than the relief HMRC describes. The second is a rate that is simply out of date: published figures still quoting 5% on domestic installations pre-date the current zero rate rather than anticipating its end, and any rate published without a date attached deserves the same caution.
Running costs are a separate question from installation VAT, governed by electricity prices rather than by this relief, and are worked through in air conditioning running costs in Yorkshire. The tax position set out above applies in the same way to a 1930s semi in Hemsworth, a Victorian terrace in Wakefield and a new-build loft conversion: it is the equipment, the use of the building and the shape of the contract that decide it, never the postcode.