Which floor is better for installing low-emissivity glass in Tianjin external windows?

It is best to install low-emissivity glass on the outermost layer of Tianjin external window. Low-E glass is a kind of coated glass, which can block the heat radiation from high temperature field to low temperature field. It can make 80% visible light enter the room and be absorbed by objects, and it can also leave more than 90% long wave radiated by indoor objects indoors, which has excellent heat insulation performance and two-way energy saving effect.