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Copper piping is the connection between your indoor and outdoor aircon units. It carries refrigerant in both liquid and gas form, and its condition directly affects how well your system cools. When piping fails, the result is a slow refrigerant leak that gets worse over time, costing you in repeated gas top-ups and declining performance until the system eventually cannot cool at all.
This guide covers how much piping replacement costs in Singapore in 2026, when it is necessary, when you can safely reuse existing pipes, and what to expect during the process.
| Item | Estimated Cost (SGD) | Notes |
| Standard piping set (up to 5m per unit) | $300 to $600 per set | Includes copper pipes, insulation and fittings |
| Extended piping (per additional metre) | $30 to $60 per metre | For longer runs between indoor and outdoor units |
| Concealed piping (embedded in wall) | $150 to $300 per section | Requires hacking and patching after installation |
| Trunking for exposed piping | $80 to $150 per run | PVC or aluminium casing for a clean finish |
| Vacuum test on existing piping | $50 to $80 | 30-minute pressure test to confirm reusability |
These are 2026 Singapore market rates. Final pricing depends on your property layout, system type and the number of units.
If you have topped up your aircon gas more than once in the past 12 months and the cooling still weakens within a few weeks, the piping likely has a leak at a joint or along the copper itself. Repeated top-ups without fixing the source of the leak are a waste of money.
Check any exposed sections of copper piping, particularly where they exit the wall or connect to the outdoor unit. Green oxidation or pitting on the surface indicates the copper has degraded and will eventually develop a leak.
Copper piping in Singapore is exposed to tropical humidity and temperature cycles continuously. After 8 to 10 years of service, the material can become brittle at joints and bends. If you are replacing your aircon units and the piping is over 10 years old, replacing it at the same time is almost always the right decision.
R22 and R32 operate at different pressures and are not compatible. If your old system runs on R22 and you are upgrading to a new R32 unit, the entire piping system must be replaced. The old R22 piping cannot safely handle the R32 operating pressure and any residual R22 oil in the pipes will contaminate the new system.
Possibly, yes. If the piping meets all three of these conditions, it can be reused:
To confirm, ask your installer to run a 30-minute vacuum test on the existing piping. If the pressure holds steady for 30 minutes with no drop, the piping is serviceable and can be reused. Reusing piping saves $300 to $800 on a multi-system installation. It is always worth testing before deciding to replace.
For the full picture on what installation involves including pricing by system type, read our complete aircon installation guide for Singapore.
Cool Channels Engineering is an experienced air conditioning service and repair company that has been serving Singapore homes and businesses for over 25 years. Our technicians assess your existing piping during the site survey and give you an honest recommendation on whether replacement or reuse is the right call.
Piping replacement is included as part of our aircon installation service. Contact us at +65 9003 9098 for a free assessment.
For a standard System 3 setup, piping replacement typically takes 3 to 5 hours including pressure testing and gas charging. Concealed piping takes longer due to wall hacking and patching.
If the piping is over 8 years old or has a leak history, yes. If it is newer and passes a vacuum test, reusing it saves money without compromising performance.
No. R22 and R32 operate at different pressures and are chemically incompatible. Full piping replacement is required when upgrading from R22 to R32.
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