AC Not Cooling? Causes, Quick Checks and 2026 Repair Costs in India

An air conditioner that runs but will not cool is the single most common summer complaint in Indian homes, and it is also the one most often over-charged for. Half of these calls are solved by a routine service that costs a few hundred rupees; the other half need a specific part. Knowing which camp you are in before the technician arrives is the difference between a fair bill and an inflated one.

This guide walks the faults in the order a good technician checks them, from the cheapest and most likely to the rare and expensive. Run the quick checks first, note what you observe, and you will be able to describe the problem accurately when you book a visit.

Start with the three free checks

Before assuming a fault, rule out the non-faults. Set the mode to Cool (not Fan or Dry), the temperature to 20-22 degrees, and fan speed to high. A surprising number of no-cooling calls are a remote left on the wrong mode after someone cleaned the room.

Next, feel the air. If it is blowing hard but only room-temperature, that points to refrigerant or compressor. If the airflow itself is weak, the problem is airflow first, cooling second, and a dirty filter is the prime suspect.

Finally, check the outdoor unit. Put your hand near it: if the fan is spinning and it is warm, the system is trying to work. If the outdoor unit is silent while the indoor runs, you have an electrical or capacitor fault feeding the compressor.

Dirty filter or coil - the cheapest and most common cause

A clogged filter chokes airflow, so the little cooling the coil produces never reaches the room and the compressor overworks. This is why an un-serviced AC both cools poorly and spikes your electricity bill. A filter clean is something you can do yourself in ten minutes; a full coil and blower service is a technician job priced at roughly 499 to 899 for a split unit.

If your AC cooled fine last season and simply feels weaker this year with no other symptom, do the service before spending on anything else. It resolves the majority of gradual-decline cases.

Low gas and refrigerant leaks

If the air is genuinely warm and the service is recent, refrigerant is the next suspect. AC gas does not deplete with use - if it is low, there is a leak, usually at a flare joint, the coil, or a corroded weld. A pure top-up without fixing the leak is money wasted; it will be gone again within weeks.

Insist that the technician does a leak test (soap or a gas detector) and quotes leak repair plus gas together. A gas refill for a 1 to 1.5 ton split typically runs 1,800 to 4,500 depending on the refrigerant (R32 costs more than older R22), and a leak repair adds to that. Be wary of anyone who refills without mentioning a leak.

Electrical faults - capacitor, fan motor, PCB

When the outdoor unit hums but the compressor or fan will not start, a failed run-capacitor is the classic cheap culprit, usually 900 to 1,600 replaced. A seized outdoor fan motor is dearer at 1,800 to 2,800. On inverter ACs a faulty PCB (the control board) can also stop cooling and is the most expensive of this group.

These are diagnosed with a multimeter in minutes. A capacitor swap is a same-visit fix; a PCB or motor may need a part to be ordered.

Compressor failure - the expensive one to confirm, not assume

The compressor is the heart of the system and the costliest part, so it is also the one dishonest technicians reach for first. A genuine compressor failure shows specific signs: the unit trips the breaker on start, or the outdoor unit is dead while every cheaper cause has been ruled out. Never accept a compressor verdict without the capacitor, gas, and electrical checks being done and shown to you first.

If your AC is under warranty (compressors often carry 5 to 10 years), the part is free and you pay only labour and gas - always check the warranty card before authorising a paid compressor job.

What to do next

Match your symptom to the table above, then book a diagnostic visit and describe what you observed - it keeps the technician honest and the quote realistic. Yantra4All engineers arrive with common parts, gas, and tools in a single visit, so most no-cooling faults are fixed the same day rather than across two trips.

If the AC is more than a few years old and has already needed gas twice, ask for an honest repair-versus-replace opinion before sinking money into a third fix.