It's my understanding that silver reflective tint is illegal in some jurisdictions for cars and trucks that are driven on the highway.
In your experience does it offer enough of a benefit - in terms of I/R rejection and heat gain - to make it worth considering for a tractor that is not driven on the road ?
Reflective film is illegal in all states for automotive uses. Think of it as a mirror and when light hits a mirror it can reflect back into someone's eyes and temporarily blind them. That said, all window film has a certain reflective value to it. There are only 3 things window film can do with light and heat. 1, absorb it, 2 reflect i, 3 transmit it. .. Some how some way those 3 things will equal 100% in a pie chart. There are what are called spectrally selective window films that are very ..very light. To the point where they are virtually un noticeable. It's possible to reject 50+% with a basically clear film. Clear film however does nothing to reduce glare. So to answer your question.. Yes film the windshield as well. Use a very light film but definitely tint it.