Tell your home insurer before or as soon as you install a fixed air conditioner, and ask them whether an outdoor unit, any extra rebuilding cost, or the work itself needs to be noted on the policy. Get the reply in writing. This page cannot tell you what your policy covers or excludes. Wordings differ. A competent F-gas install and a surveyed outdoor position are the facts worth describing. Do not assume you are uninsured, and do not assume you are fully covered.
One clause does not exist for every policy
Insurers do not share one clause about air conditioning. Some want to know about external plant. Some care about water damage from condensate. Some only care if you are making a structural alteration. The only wording that applies to you is the one your insurer confirms against your address. Citizens Advice is a starting point for the consumer side of home improvements. It is not your policy schedule.
Write the condenser in plain language
Email is better than a vague phone memory. Quote the model type in plain language: wall-mounted split, outdoor condenser, installed by an F-gas certified company. GOV.UK is where that company certification is set out. Attach nothing secret, and file their reply with the commissioning pack.
Facts to describe, claims not to invent
Describe the spot, the core and who is doing the work.
- Where the outdoor unit will sit.
- Whether a core hole goes through an external wall.
- Who is doing the electrical and refrigerant work.
- On a flat, whether the freeholder has consented.
A note on the file is not a future payout
An insurer can ask about freeholder consent. They might not. You will not know until you ask. Do not add dramatic claims about floods, fires or write-offs. Condensate is a normal design item when it is piped properly. A pump that was never tested is how ceilings stain. That is an installation quality point, not a universal insurance exclusion. Energy Saving Trust describes air-to-air heat pumps. It does not describe your buildings cover.
A note on the policy, if they want one, records the risk as it is. It does not promise that every later breakdown is an insured event. Mechanical breakdown, wear, and poor maintenance are often outside buildings cover. Read whatever they send you. If you do not understand it, ask them, not a salesperson.
Warranty papers are a different pile
Manufacturer warranties and your contract with the installer cover a different set of faults from the insurance policy. Keep those documents separate so a filter problem is not sent to the insurer by mistake. Before you accept a quote, you can ask the installer for model codes and a description you can forward. Survey photos of the outdoor position help you describe the job accurately. F-gas company details belong in that pack.
When commissioning before you ask is the wrong order
Do not assume home insurance automatically covers a new outdoor unit, and do not assume it refuses one. Ask, and keep the written reply. Policies are not identical, and this page will not invent terms for yours. You can survey in parallel. Do not commission the install until you have asked them, especially if the outdoor unit is a visible alteration on a flat or a listed building. Refrigerant work without F-gas certification is unlawful as well as unwise. Whether a claim would be refused after a DIY fit depends on the policy and the facts. Use a certified company and tell the insurer what you have done. Mention any condition they set, such as a particular location or a professional install, so the quote matches it.
Core buying guides
Start with these high-intent guides, then dig into the rest of the library.
Related guides
Sources and further reading
How this guide was prepared
This guide was written by the Local AC Installers Editorial Team. We compare official guidance, legislation and established consumer information, separate general information from project-specific advice, and show publication dates and sources. We do not accept installer accreditation claims at face value.