Hmmm, I hit the submit button and my post got lost somewhere. Oh well, I'll retype it.
If your car is registered in MA, state laws allow a 35% net tint all the way around, including front driver's and front passenger's windows, at least according to IWFA's chart. And they keep up with all legislation throughout the country. If you have a medical doctor's exemption, you can even go darker.
It's true that you may not have intense sun year round, but UV rays nevertheless fade upholstery, carpet, door panels, etc. and UV rays can be intense in winter. And UV rays bounce off of water, snow, and hard surfaces. So, with a 35% tint and 99% UV protection in good quality film, you can expect about a 75% reduction in the fading rate of your car's interior.
IMO, looking out of a 35% tint is pretty easy to do. My car right now has 35% in the front (darkest allowed--but I would go darker if it was legal).
Another benefit is if the glass is shattered the film would have a tendency to hold the glass together rather than have a thousand pieces all over the interior of the car.
Sorry, not trying to make a federal case out of this but just wanted to give some good reasons to consider tinting and make your car even more special to you.
