AC Not Cooling in Delhi? 10 Causes, Repair Cost and Expert Fix Guide 2025 Delhi summers are unforgiving. When temperatures cross 45 degrees Celsius and your air conditioner stops cooling, every hour without a fix feels unbearable. The good news is that most AC cooling problems have a clear diagnosis and a straightforward repair — if you know what you are dealing with.
This guide gives you exactly that: the 10 most common reasons an AC stops cooling in Delhi, what each repair costs in 2025, which AC brands have the most issues, and how to book a verified technician who will not overcharge you.
10 Reasons Your AC Is Not Cooling in Delhi
1. Low Refrigerant Gas (Most Common) Refrigerant gas is what makes your AC actually cool the air. Over time, small leaks develop in the refrigerant line and the gas level drops. Without enough gas, the AC blows air but no cooling happens.
This is the number one reason ACs stop cooling across Delhi NCR — especially in ACs that are 3 or more years old.
##Signs##: AC blowing room temperature air, compressor running non-stop, ice forming on copper pipes.
Repair: Gas refill after leak detection. Cost: Rs 800 to Rs 3,000 depending on gas type and AC capacity.
2. Dirty or Blocked Air Filter & Air filters trap dust, pollen, and pollutants. Delhi's air quality means filters get clogged faster here than almost anywhere else. A completely blocked filter means almost no air can pass through the indoor unit.
Signs: AC running but very little air coming out, musty smell, AC feels warm.
Fix: Filter cleaning or replacement. Cost: Rs 100 to Rs 300. This can even be done yourself.
3. Dirty Condenser Coils (Outdoor Unit) The outdoor unit releases heat absorbed from inside your room. When the condenser coils are covered in dust and debris — extremely common in Delhi's construction-heavy neighborhoods — heat cannot escape and cooling efficiency drops sharply.
Signs: AC working harder than usual, outdoor unit very hot, cooling weak in afternoon peak heat.
Fix: Condenser coil cleaning — outdoor unit jet wash. Cost: Rs 400 to Rs 800.
4. Faulty Compressor The compressor is the engine of your AC. It compresses the refrigerant and drives the entire cooling cycle. When it fails, there is simply no cooling at all.
Signs: AC turns on but no cooling whatsoever, loud clicking or grinding sound from outdoor unit, circuit breaker tripping.
Fix: Compressor repair or replacement. Cost: Rs 3,000 to Rs 12,000 depending on brand and capacity.
5. Frozen Evaporator Coils This happens when airflow is restricted — usually because of a dirty filter or low refrigerant. Ice builds up on the evaporator coils inside the indoor unit, completely blocking cooling.
Signs: Ice visible on the indoor unit or copper pipes, water dripping more than usual, AC working but no cooling.
Fix: Defrost the unit, fix the root cause (dirty filter or gas leak). Cost: Rs 300 to Rs 1,500.
6. Faulty Capacitor The capacitor starts and runs the compressor and fan motors. A failed capacitor is one of the most common AC repairs in India — especially after the summer storage period when ACs are switched on after months off.
Signs: AC turns on but shuts off within seconds, fan starts slowly, humming sound without cooling.
Fix: Capacitor replacement — a quick and affordable repair. Cost: Rs 300 to Rs 800.
7. PCB or Control Board Malfunction The printed circuit board controls every function of a modern AC. A PCB fault can cause the AC to not start, not cool correctly, or show error codes.
Signs: Error codes on display, AC not responding to remote, random shutdowns.
Fix: PCB diagnostics, repair, or replacement. Cost: Rs 1,500 to Rs 5,000.
8. Refrigerant Line Blockage Sometimes the refrigerant line gets blocked due to moisture or contaminants. This restricts gas flow and stops cooling even if gas levels are fine.
Signs: AC blowing warm air despite good gas pressure readings.
Fix: Line flushing and filter drier replacement. Cost: Rs 800 to Rs 2,000.
9. Incorrect AC Size for the Room This is not a repair issue — it is an installation problem. An AC that is too small for the room will run continuously but never reach the set temperature, especially in Delhi summers.
Signs: AC never reaches the set temperature, runs non-stop, electricity bill very high.
Fix: Upgrade to a higher tonnage AC or reduce the room heat load.
10. Thermostat or Sensor Fault The temperature sensor tells the AC when to start and stop cooling. A faulty sensor gives wrong readings, causing the AC to cut off cooling too early.
Signs: AC stops cooling before room reaches set temperature, temperature fluctuates.
Fix: Sensor or thermostat replacement. Cost: Rs 400 to Rs 1,200.
AC Repair Cost in Delhi 2025 — Full Price List Service
Estimated Cost
Visit and inspection charge | Rs 149 to Rs 299
Air filter cleaning | Rs 100 to Rs 300
Gas refill R-22 | Rs 800 to Rs 1,500
Gas refill R-410A | Rs 1,500 to Rs 2,500
Gas refill R-32 | Rs 1,800 to Rs 3,000
Capacitor replacement | Rs 300 to Rs 800
Condenser coil cleaning | Rs 400 to Rs 800
Evaporator coil cleaning | Rs 300 to Rs 700
Fan motor replacement | Rs 600 to Rs 2,000
Compressor repair | Rs 2,000 to Rs 6,000
Compressor replacement | Rs 4,000 to Rs 12,000
PCB repair | Rs 1,500 to Rs 5,000
Thermostat or sensor repair | Rs 400 to Rs 1,200
AC deep cleaning service | Rs 499 to Rs 999
Brand-wise AC Repair Cost in Delhi
Brand | Common Problem | Avg Repair Cost
Voltas | Gas leak, PCB | Rs 800 to Rs 5,000
LG | Compressor, capacitor | Rs 800 to Rs 6,000
Samsung | PCB, inverter board | Rs 1,000 to Rs 5,500
Daikin | Refrigerant issues | Rs 1,000 to Rs 5,000
Hitachi | Compressor, PCB | Rs 1,200 to Rs 6,000
Blue Star | Gas, coil cleaning | Rs 800 to Rs 4,500
Carrier | Capacitor, PCB | Rs 900 to Rs 5,000
Whirlpool | Gas, fan motor | Rs 700 to Rs 4,000
Split AC vs Window AC vs Inverter AC — Repair Differences
Split AC repairs are the most common in Delhi. They have more components but parts are widely available. Most repairs cost Rs 500 to Rs 4,000.
Window ACs are simpler and cheaper to repair. Most issues resolve in Rs 300 to Rs 2,000. However spare parts for older models can be hard to find.
Inverter ACs have complex electronics. Inverter board repairs are expensive — Rs 2,000 to Rs 6,000. However they use less electricity and gas issues are less common due to better sealing.
AC Service vs AC Repair — What Is the Difference?
Many people confuse routine servicing with actual repair. Here is the difference:
AC Service (Rs 299 to Rs 799): Cleaning of filters, coils, drain pipe. No part replacement. Should be done once before summer and once before winter.
AC Repair (Rs 500 upwards): Fixing a specific fault — gas refill, compressor issue, PCB problem, capacitor failure. Done when AC has a specific problem.
Getting an annual service done significantly reduces the chance of needing a repair during peak summer.
AC Maintenance Tips for Delhi Summer
Clean or replace filters every month during summer — Delhi's dust clogs filters fast.
Keep outdoor unit area clear — at least 1 foot of clearance on all sides.
Service before April — before peak demand hits and technicians get busy.
Use timer mode at night — 26 degrees is optimal for sleep and energy saving.
Check copper pipe insulation annually — worn insulation reduces cooling efficiency.
Do not block indoor unit vents with curtains or furniture.
How RepairWalaa AC Repair Works in Delhi
RepairWalaa has verified AC technicians available across all major Delhi NCR areas. The process is simple:
Book online — select AC repair and your Delhi area.
Technician arrives at your chosen time — same day available.
Free inspection and upfront quote — no work starts without your approval.
Repair completed at home — genuine parts used.\n30-day service warranty — if the same issue returns, it is fixed free.
Coverage includes South Delhi, North Delhi, Dwarka, Rohini, Noida, Gurgaon, Faridabad, Ghaziabad and all major areas.