Can Blackout Curtains Actually Reduce Heat in Singapore? Here’s What We Found

If you live in Singapore, you already know how intense the heat can get, especially in the afternoon.

Many homeowners look for ways to keep their homes cooler without relying too much on air conditioning. One of the most common solutions people consider is blackout curtains in Singapore.

But do they actually work, or is it just another home trend?

Let’s take a closer look at what blackout curtains really do and whether they can make a difference in Singapore homes.

If your room still feels warm even with curtains, you can read:
Why Your Room Still Feels Hot Even With Curtains in Singapore Humid Weather

Do Blackout Curtains Really Reduce Heat?

The short answer is YES, but not completely.
Blackout curtains in Singapore are designed to block sunlight, and since sunlight is one of the main sources of heat, reducing it helps lower the overall temperature in your room.

They work by blocking direct sunlight, reducing heat entering through windows, and slowing down heat buildup. While they will not make your room cold on their own, they can significantly improve comfort.

How Blackout Curtains Work

Most blackout curtains in Singapore are made with multiple layers of tightly woven fabric. But here’s what most people don’t talk about. Not all blackout curtains are created equal. The GSM (grams per square metre) of the fabric makes a huge difference.

GSM measures how heavy and dense the fabric is. The higher the GSM, the thicker the material, and the better it blocks heat and light.

For example, our LYNN Collection (JEN-08 Pigeon) uses a 380 GSM dimout fabric which is tightly woven, 100% polyester with a light fastness rating of 4–5, meaning it holds its colour and performance even under Singapore’s intense sun exposure.

For homeowners who want an even heavier, more premium option, our E1222 Embossed Dim-Out fabric weighs in at 928 grams per linear metre, a substantial, structured fabric with an embossed texture that adds both visual depth and superior light-blocking performance.

These layers work together to:

• Block out light effectively
• Reduce heat penetration through the window
• Protect your interior from UV exposure
• Add a layer of insulation between the glass and your room

The rule is simple. The thicker and denser the fabric, the better the insulation.

Why Some Homes Still Feel Hot

Even with blackout curtains, some homeowners still experience heat. This is because heat can enter through walls and ceilings, gaps around curtains allow warm air in, and Singapore’s humidity traps heat indoors.

This means blackout curtains help, but they are not a complete solution on their own. Pairing them with the right fabric weight like our 380 GSM or above options gives you the best fighting chance against Singapore’s heat.