Why is your electricity bill so high? Start at the windows, not the AC

Every summer the same scenario repeats: the bill jumps, so the owner replaces the air conditioner or upsizes it. A month later the bill is unchanged. The cause is that the problem is not the cooling — the problem is that the cool air escapes.

Where exactly does the cool air go?

The concrete wall of a typical Saudi home resists heat reasonably well. A window, however, is an opening in that wall — and if it is single glazed in an aluminium frame with no thermal break, it is effectively a thermal hole. In a house where openings make up 15% of the wall area, those openings can account for a large share of the total heat load.

Three mechanisms of heat transfer — and how we stop each

• Conduction through the frame: stopped by a multi-chamber uPVC profile, or by a thermal break in aluminium.
• Radiation through the glass: stopped by a Low-E coating that reflects infrared while passing visible light.
• Air leakage around the frame: stopped by twin gaskets and insulating foam around the perimeter of the opening.

An insulated window does not cool the house — it stops the cool from leaving. That is exactly what lets the AC cycle off.

What is the real difference on the bill?

The difference we record with clients after a full replacement ranges between 15% and 30% of cooling consumption. That figure is not fixed — it depends on the number of openings, their orientation and area, and on how well the roof and walls are insulated. A house with large, sun-exposed west-facing openings sees a far bigger change than one whose openings face north and sit in shade.

Self-check: try these three at home

• At 3pm, touch the inside of a west-facing pane. If it is hot, heat is entering by radiation.
• Touch the frame itself. If the frame is hotter than the adjacent wall, you have a thermal bridge.
• Hold a thin sheet of paper near the frame perimeter with the window shut. If it flutters, you have air leakage — the worst of the three.

Is replacement worth it financially?

The honest answer: it depends on your current bill and the age of the property. If summer bills are very high and you intend to live there for years, the change pays itself back gradually — alongside a non-financial benefit in comfort and quiet. If you are selling within a year the direct financial return is smaller, but new windows raise the value and shorten the sale.

Want a rough calculation for your own home? Send "فاتورة" on WhatsApp with the number of openings and the orientation of the main elevation, and we will give you a realistic estimate — without exaggeration.