There are ways to paint vinyl windows. There have been posts on here with the best way to do it. Would I do it, no as I am not a fan and have my doubts it would last but in this instance I would certainly look for the method and try it until you can replace the windows. The paint may not stick well even with a bonding primer as the sun damage may have caused some havoc with the vinyl material it self.

Thanks for the info!

Can you take a pic of the whole window from a little farther back?

If the area in question was white vinyl, that is certainly an extreme and uncommon reaction. What type of room is this unit in? Do you see something similar on other windows or just this one?

This is the only window with this damage. We assume it’s because we have a blackout blind that was reflecting the heat. It is our primary bedroom window and the room is south facing

This is the entire window. You can see the damage is just on the two center verticwl pieces near the top

We are planning to sell the house in the next year and are looking for a way to manage this aesthetically prior to listing it.

Wow, that is really interesting. Looks almost like it actually burned the vinyl.

Presuming that this isn't the "smoking room" of the house, the blind theory is likely correct. You could try a buffing compound to see if the discolored area can be removed from the surface of the vinyl, otherwise the paint that MWM alluded to would be the other option.

The key to making that look good and last will be prep of the surface and using the correct paint/primer for vinyl windows... This probably goes without saying, but I'd also avoid using that blackout blind after painting.

Thanks everyone- appreciate your input on this