Your SEC bill jumped SAR 400 this summer. Your AC is the reason — and the fix usually costs under SAR 100.

The mechanism: why a dirty AC costs more

Your AC doesn't use a fixed amount of electricity. It uses whatever it takes to reach and hold the temperature you've set. If the system is running efficiently, it reaches the target quickly then cycles off or reduces power. If it's struggling — because of a dirty coil, blocked airflow, or low gas — it runs at full power continuously, trying and failing to reach the target.

That's the key insight: a struggling AC doesn't use more electricity per hour — it uses electricity for more hours. Instead of cooling your Al Worood apartment in 20 minutes then cycling down, it runs flat-out for 3 hours and barely gets there. Your SEC meter runs the whole time.

The 4 causes — in order of how easy they are to fix

1. Dirty filter (free, most impactful)

A blocked filter reduces airflow to the indoor coil. The coil can't absorb heat properly. The system runs longer to achieve the same cooling. In Riyadh's dusty environment, a filter installed 6 weeks ago and never cleaned can be 70–80% blocked. Clean it today — rinse under the tap, dry, put it back. You'll feel the difference in airflow within an hour.

2. Dirty indoor coil (SAR 99, very impactful)

Fine dust penetrates through the filter and coats the coil fins over months. The coil is the heat exchanger that absorbs heat from your room air — when dust-coated, it does that job less efficiently. The compressor runs longer. More electricity. A professional chemical deep clean restores the coil's heat absorption. In an Al Worood apartment I serviced last June, the customer's next SEC bill dropped SAR 180 — from SAR 640 to SAR 460 — for the same usage period. Three ACs, SAR 297 total cost, paid back in 7 weeks.

3. Dirty outdoor condenser coil (included in deep clean)

The outdoor unit releases heat from your home into the outside air. When the condenser coil is packed with Riyadh dust — fast after any shamal — it can't release that heat efficiently. The compressor draws more current to maintain the same pressure. This is why I always clean both the indoor and outdoor units in one service call. Cleaning only one leaves half the problem in place.

4. Low refrigerant gas (SAR 250–350)

A system running on 70% of its correct gas charge uses roughly 20–30% more electricity while providing noticeably worse cooling. The compressor runs continuously without ever completing the refrigeration cycle properly. If you've cleaned the filter and done a deep clean but your bill is still high and cooling still weak — get the pressure checked. Confirms in 15 minutes.

The thermostat setting is also worth checking

Each degree you raise the thermostat saves 6–8% on cooling electricity. The difference between 18°C and 22°C is approximately 25–30% less electricity consumption. Most Al Sulaimaniyah apartments I visit have their AC set to 18°C — cold enough to need a blanket in summer. Raising to 22°C is comfortable for most people and dramatically more efficient. The optimal range for both comfort and efficiency in Riyadh is 22–24°C.