Aircon Taking Too Long to Cool?

When your aircon takes much longer than usual to cool the room, it’s not working efficiently. The system may still blow air, but behind the scenes, something’s slipping: gas pressure, airflow, coil condition, or compressor performance.

Why Your Aircon Might Be Cooling Too Slowly

1. Low refrigerant level

If gas pressure is low, cooling slows down significantly. The unit runs longer to reach the set temperature — often without success.

2. Dirty filters or coil

Dust on filters or the evaporator coil blocks airflow and heat exchange. Cooling becomes sluggish, even though the fan seems fine.

3. Compressor starting to weaken

In older or inverter systems, a tired compressor may still run — but struggle to build enough pressure to cool efficiently.

4. Wrong fan or mode settings

If set to low fan or “fan only” mode, cooling output drops — even if everything else is working.

5. Hot external conditions

In strong afternoon sun, especially in west-facing rooms, poor insulation or sunlight exposure can overwhelm the cooling load.

6. Undersized unit

If the aircon is too small for the space, it may run endlessly without hitting target temperature — especially in open layouts.

What You Can Check First

• Is the filter clean?

• Fan set to high?

• Outdoor unit running consistently?

• Any cold air at the start — or weak throughout?

If the system used to cool well, and now doesn’t — something’s changed.

Why It Matters

Slow cooling = system strain.

If ignored:

• Electricity usage spikes

• Unit runs longer than necessary

• Compressor lifespan shortens

• Gas leaks or deeper faults may go unnoticed

Sluggish cooling is often the first sign before full failure.

When to Book a Diagnostic

✅ Cooling time has noticeably increased

✅ System runs continuously without reaching set temperature

✅ Cooling weaker even after filter cleaning

✅ Cold air present, but doesn’t spread well

We’ll check gas pressure, compressor performance, coil condition, and airflow delivery — and advise what’s dragging the system down.