If your AC is cooling but not enough — room temperature drops some but never reaches the set temperature — the cause is usually insufficient capacity, dirty coils, or low gas.
Data Verified: 2026The most common cause is undersized AC for the room. If a 1 ton AC is cooling a 200 sq ft room, it will provide some cooling but never reach 24°C on a hot day. Use the tonnage calculator to verify sizing.
Low gas causes gradual cooling loss — the AC may have been fine when new but declining performance over 2–3 years indicates slow refrigerant leak. A technician pressure check (₹200–400) can confirm this.
Dirty condenser coil on the outdoor unit is another cause — a dirty coil cannot reject heat efficiently, limiting the cooling the system can produce. Annual cleaning of the outdoor coil restores 10–15% lost efficiency.
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Why does AC cool but temperature never reaches the set point?
Either the AC is undersized for the room heat load, gas is low, or the outdoor condenser coil is dirty. Start with tonnage check, then call a technician for gas pressure and coil inspection.
What temperature should my room reach after 30 minutes of AC?
A correctly sized and functioning AC should drop room temperature by 8–12°C within 30 minutes. If it drops less, there is a capacity or maintenance issue.
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