Buying a Second-Hand AC: What to Check Before You Pay

Second-hand ACs move quickly in this market: a tenant leaves, a flat is renovated, a shop closes. Some are genuinely good buys. The difference between a good buy and a two-summer mistake is visible in fifteen minutes if you know what to look at.

Start with the age and the gas type

The manufacturing date is on the rating label, usually on the side of the outdoor unit or inside the indoor unit’s front panel. Under five years old is worth inspecting. Over eight, the compressor is in its last third of life whatever the seller says.

The refrigerant matters more than most buyers realise. R22 units are cheap because gas for them is being phased out and is increasingly expensive and hard to source. R32 and R410A units are serviceable for years to come. An R22 unit at ₹6,000 is not a bargain; it is a future refrigerant problem.

A model number you can search is worth more than any verbal description. Check the star rating and the year on the label against the manufacturer’s listing.

The physical checks, in order

• Outdoor chassis rust. Look at the base plate and the bottom row of the coil. Rust through the base means the unit has been sitting in water and the coil is not far behind.
• Coil fins. Bent, crushed or grey-green fins indicate corrosion. A few bent fins are cosmetic; a corroded coil is a replacement.
• Indoor blower. Shine a light through the intake. A heavily dust-packed blower tells you how the unit was maintained for its whole life.
• Pipe ends. Cut flares, not sealed ones, mean the gas escaped when it was removed. Sealed and pressurised is a much better sign.
• Fan and compressor noise on a test run. Ten minutes running tells you more than any paperwork.

The test run you must insist on

Ask for the unit to be running when you arrive, and watch it for ten minutes. You want: cool air within three minutes, no rattle from the fan, a compressor that starts cleanly without a click-retry cycle, and no ice forming on the indoor coil.

If the seller cannot run it because it is already dismantled, price it as a unit of unknown condition — which for a used AC means roughly half of what a working one would fetch.

The cost nobody adds up

A "₹9,000 AC" often lands near ₹16,000 installed and serviced. Compare that against a new 3-star unit at ₹28,000 with a warranty, and the used unit has to be genuinely good to justify itself.

When a used AC is the right buy

Buy used when the unit is under five years old, the outdoor chassis is sound, the refrigerant is R32 or R410A, it runs cold on a ten-minute test, and you are moving it into a room where a cheap installation is easy — a ground-floor wall, an existing bracket, a short pipe run.

Also when the seller is a neighbour or a tenant you know, and the unit is currently installed and running. Seeing it work in place is worth more than any inspection.

When to walk away

Walk away from: rust through the outdoor base, an R22 unit, a compressor that clicks and retries, any ice on the coil during the test run, cut pipe ends with no gas, and any unit whose indoor blower is packed solid with dust.

And walk away from a unit with no visible model label. Without it you cannot order parts, and parts availability is what decides whether a repair is possible at all.