I had the windows tinted on my 02 Excursion. Never had a problem seeing even at night. The Excursion has front and rear heat and air to help cool all of its interior space. The rear windows on the X are factory tinted. Are your rear windows factory tinted on your SD?
Also, when was the last time you had the AC Evan and recharged. It may just need that. I had to do mine when it was 7 years old. Sometimes they just get low, even with no signs of a leak. It's just how they are.
I say to have it evac and recharged and see how it does. Then if you want you can have the windows tinted. I know I loved not having the sun beatin in through he side windows when driving.