Troubleshooting guide
AC Not Cooling?
Common Causes, DIY Fixes & Repair Cost Guide
Updated January 2026 · 3 min read
Quick answer
An AC not cooling is usually caused by dirty filters, low refrigerant (gas), a faulty compressor, or blocked outdoor unit airflow. In Mumbai humidity, clogged drains and frozen coils are also common. Book a verified AC technician on ProFixer for diagnosis — most fixes are same-day when slots allow.
Key Takeaways
- Clean or replace filters every 2–4 weeks in summer.
- Low gas needs a leak check before refill — topping up alone is temporary.
- Outdoor unit clearance (30 cm+) improves cooling efficiency.
- Frozen evaporator coils often mean airflow or gas issues.
- Professional diagnosis costs less than repeated DIY attempts.
Common symptoms
Warm air from vents
Unit runs but airflow is not cold.
Weak airflow
Cooling feels low even at lowest temperature.
Ice on indoor coil
Often follows restricted airflow or low gas.
AC trips frequently
Can indicate compressor or electrical stress.
Common causes
Dirty filter
Low gas
Faulty compressor
Blocked condenser
Thermostat issue
Causes & recommended fixes
| Cause | Fix |
|---|---|
| Clogged air filter | Clean or replace the filter and restart after 15 minutes. |
| Low refrigerant / gas leak | Technician pressure-tests, fixes leak, then refills R32/R410A as per unit spec. |
| Dirty condenser coils | Deep cleaning of indoor and outdoor coils during service. |
| Faulty compressor or capacitor | Electrical test; replace failed part after quote approval. |
DIY checks (safe at home)
- 1
Check the thermostat
Set to cool mode, 22–24°C, and ensure fan is on Auto or High.
- 2
Inspect filters
Turn off power, remove filters, wash and dry completely before reinstalling.
- 3
Clear outdoor unit
Remove debris around the outdoor unit; ensure nothing blocks airflow.
Repair cost estimate
| Item | Price range | Notes |
|---|---|---|
| Filter cleaning / basic service | ₹499 – ₹899 | — |
| Gas refill (split) | ₹1,800 – ₹4,500 | After leak check |
| Compressor repair | ₹3,000 – ₹8,000 | — |
Understanding AC cooling issues in Mumbai
When your split or window AC blows warm air in Mumbai's heat, the problem is rarely a single fault. Most households see cooling drop because of restricted airflow (dirty filters, blocked vents), refrigerant issues (slow leaks after monsoon vibration), or electrical wear on capacitors and compressors.
ProFixer connects you with verified AC technicians across Mira Road, Bhayandar, Borivali, and greater Mumbai. Transparent pricing, same-day slots when available, and 30-day workmanship warranty on eligible repairs.
Frequently asked questions
How much does AC gas refill cost in Mumbai?
Split AC gas refill on ProFixer typically ranges from ₹1,800 to ₹3,500 depending on tonnage and refrigerant type, plus leak repair if needed.Can I fix AC not cooling myself?
Filter cleaning and clearing outdoor debris are safe DIY steps. Gas, electrical, and compressor work should be done by a certified technician.
Need AC Repair help?
Book verified technicians with transparent pricing and same-day slots when available.