Yes, certain false ceiling materials reduce the heat and make the room cooler.

Question
Does a false ceiling have any impact on energy efficiency and utility costs?
By vivek kumar, 28 March, 2024

Looking at sprucing up your home with a striking effect? False ceilings may just add a bit of class and elegance to your space. It is a popular architectural and interior design feature used in buildings to create an additional layer of ceiling below the main structural ceiling. The false ceiling has both functional and aesthetic purposes.