Observe south windows carefully to determine their need for tint or shading devices. Windows facing east or west are the main source of intrusive heat. Without shade or tint, these east or west windows can admit significant heat to the interior of a building since they experience many hours of direct sunlight daily. Shading devices or tint is definitely recommended for these windows. If exterior-shading devices cannot be installed, window or glass treatment should be considered.
Treatments can be either heat reflecting glass or heat reflecting coatings.
So, in most cases if glass treatment is to be added to an existing building, tinted film is applied. Some require professional installation but there are some owners can install themselves. Some window films offer the added benefit of making your glass shatter-resistant. As always, we recommend you get bids from at least three contractors. Installation cost depends on the size of the individual glass panes as well as the overall square footage of film required.