Yes—especially when sunlight falls directly on your windows. Closing curtains during sunny hours helps reduce heat entering the room.
Try these simple habits:
- Close curtains when sunlight reaches the window, rather than waiting for the room to heat up.
- While the AC is running, close windows and doors leading to areas you do not need to cool.
- When outdoor air becomes cooler, you can turn off the AC and ventilate the room.
Help your room retain its cool air instead of continually letting heat in. Results depend on windows, insulation and sunlight, so there is no single savings percentage for every home.