Spectrally Selective Window Films
Keep the heat out!
These films work by rejecting the maximum amount of heat while also allowing in the maximum amount of visible light. Typically, a spectrally selective film will have about 70% VLT but reject 50% heat and 25% glare.
They are the ideal film if you want heat rejection and to keep a natural look to the windows as it's barely visible once fitted. They offer nothing in the way of privacy and have a low internal reflection. As you can imagine, these films cost more and are more labour intensive to install as the edges need to be sealed once fitted.
The photo on the right shows a 70% VLT spectrally selective film in a pair of patio doors