On tinting your windows.
If you do not want to install a permanent film then i would suggest you take a look at these films. Not only do we use them we use some of the other films for a small business applications.
They are removable cling but unlike the cheaper store versions that basically suck..these are a professional series of films. On the page I linked to go down to tinted films of which there are three. Two light reducing and one mylar reflective. The reflective to me is the best at blocking UV heat but....you need to know if you have double pane windows. If so then the film has to go on the outside of the windows. The non reflective style does not matter.
You can order samples first if you like from them. Best part is they are removable and reusable. Application is like any other adhesive film in that you would lightly wet the film and window and apply then squeegie. But all that is in the instructions.
Decorative Films | Window Film | Stained Glass | Privacy | Treatment
I use the frosted films and cut glass more often but have used the reflective on my 5th wheel when we were in a seasonal site that had no shade...now I have shade so I just peeled it off and saved it.