You’ll see confident figures online for how many years an air conditioning system lasts. Manufacturers don’t publish a lifespan, and the range is wide: some systems are going strong long after others of the same age have been replaced. What matters is what the system has been through.
This guide covers what shortens or extends a system’s life, the signs it’s nearing the end, and how to make the repair or replace decision without being pushed either way.
What affects lifespan
- Installation quality. This is set on day one. Clean, dry pipework, properly made joints, a pressure test, evacuation and the correct charge give a system a good start. Shortcuts here show up as leaks and compressor problems years later.
- Correct sizing. An undersized unit runs flat out every hot day. A badly oversized one cycles on and off. Both wear parts faster.
- Maintenance. Clean filters and coils keep pressures and temperatures where they should be. Blocked filters and dirty outdoor coils make the compressor work harder. See what an annual service includes.
- Hours of use. A bedroom unit used on summer nights and a server room unit running all year are very different duties.
- Environment. Salt air near the coast, kitchen grease, dust from building sites and leaves piled against the outdoor unit all take their toll. Our coastal guide covers corrosion.
Which parts wear out
The parts we replace most on older systems are fan motors, capacitors, condensate pumps, sensors and control boards. These are usually repairable. The expensive failures are the compressor and refrigerant leaks in the coils. A leak in an outdoor coil that has corroded, or a failed compressor on an older system, is often the point where replacement makes more sense.
Signs a system is near the end
- It needs refrigerant topping up again and again: a recurring leak that hasn’t been found or can’t be fixed economically.
- Cooling or heating has dropped over several seasons even after servicing.
- Repeated faults and error codes, or parts that are no longer available.
- Visible corrosion on the outdoor coil or casing.
- Louder running, rattles or vibration from the compressor.
- It uses R22 refrigerant.
Want it done properly? AirCon Doctor installs, repairs and services air conditioning and heat pumps across London and the South East, from our base in East Grinstead. We’re an F-Gas certified company and NICEIC approved. Get a fixed-price quote.
R22 systems: time to replace
R22 is an ozone-depleting HCFC. According to DEFRA’s HCFC phase-out information sheet, virgin HCFCs couldn’t be used to service equipment from 1 January 2010, and from 1 January 2015 no HCFCs at all, including recycled ones, could be used for servicing. You can keep running an R22 system, but no work involving breaking into the refrigerant circuit is allowed. So when an R22 system leaks or the compressor fails, it can’t legally be repaired in the usual way. If you still have one, plan its replacement rather than waiting for the breakdown.
R410A systems: still repairable
R410A systems can still be repaired and serviced legally. The refrigerant has a high global warming potential (2088 under Annex I of Regulation 517/2014), and the GB phase-down of HFC supply means it’s likely to get scarcer and dearer for top-ups over time. That doesn’t mean you must replace a healthy R410A system, but it’s a factor if it’s already needing major repairs. Our guides to repairing or replacing older systems and the 2027 phase-down go into more detail.
Repair or replace?
We look at it this way:
- What’s actually wrong? A proper diagnosis comes first. Our repair call-out with diagnosis starts from £75 + VAT.
- How much is the repair against a new system? A small part on a sound system is usually worth fixing. A compressor or coil on an older system often isn’t.
- Which refrigerant? R22 means replace. R410A is a judgement call.
- Does the system still suit you? If the room use has changed, or you now want heating too, a new system can be sized for how you live now.
A replacement split system for one room is £1,200 to £2,200 + VAT. Removing the old system and recovering its refrigerant are set out on your quote. Newer systems are generally more efficient and quieter, and come with a fresh manufacturer’s warranty: for example, Daikin’s standard warranty on split air conditioning is two years.
Quick answers
How many years does air conditioning last?
There’s no fixed figure. Installation quality, sizing, maintenance, hours of use and the environment all make a big difference. Well-installed, serviced systems tend to last much longer than neglected ones.
Can an R22 air conditioning system still be repaired?
Not in any way that involves opening the refrigerant circuit. Using HCFCs for servicing has been banned since 2015. Plan to replace it.
Is it worth repairing an old air conditioning unit?
If the fault is a fan motor, capacitor, sensor or pump on an otherwise sound R32 or R410A system, usually yes. A failed compressor or leaking coil on an older system is often the point to replace.
Related services
- Air conditioning repair
- Air conditioning installation
- Air conditioning servicing
- Air conditioning regas
More advice
- R410A and R22 Air Conditioning: Repair or Replace?
- The 2027 F-Gas Phase-Down in Great Britain: What It Means for You
- Air Conditioning Annual Service: What’s Included and Why It Matters
- R32 vs R410A Refrigerant: What You Need to Know
- All advice
This guide is general information, checked against the sources linked on 30 October 2026. It isn’t legal, tax or financial advice. Rules, grants and product ranges change, so check the current position before you rely on it.