Any building that has glass is eligible for window tint. It is typically applied to the inside of the window. Some films are applied to the exterior depending on the circumstance.
We always use a methodical multi step process to make sure the glass is crystal clear prior to film installation.
A most window films are eligible for a limited lifetime warranty against bubbling, delamination, or color changes. We file the warranty with the manufacturer on your behalf and provide you a copy. Should the unlikely event occur that you need to file a warranty claim, any authorized dealer can complete the work.
Think about a limousine. People outside cannot see in, but the occupants inside are able to clearly see out. Even with our darkest most reflective films as seen below, you can still see outside as long as there is light to be seen.
Any size and shape window can have film applied. Window film is supplied in rolls up to 6 feet wide and 100 feet long. Seams are rarely require as film can be applied horizontally in addition to the typical vertical application.
This is a difficult question to answer without doing a full energy audit of your business or home by an engineer. That being said, not only is there a measurable reduction in heat transferred into the space, but you can literally feel the difference with your hand. Ask for a heat lamp demonstration!