Yurt Dome Heat Blocking

[Paola]

Hello all. First time poster. I have a 20' yurt that I use as a vacation rental. I had very happy guests leave today but they mentioned that during the middle of the day, the light coming through the

dome

gets very hot, and the a/c was just not cutting it, even though I do have a higher BTU than needed for the space. I am hesitant to allow guests to open the

dome

because we get random showers and if a guest forgets to close the dome....well, that would be a mess.
So my question is, has anyone come up with a good solution for reducing the sun heat coming through the dome? My two current options are a product called EZ Snap that is an exterior shade basically, which would attach to the exterior of the dome but can still see through from the inside. It looks like a good option except for the crawling across the yurt roof to get to the dome to install it. I also like it because it blocks the heat from getting to the dome which will help protect the dome over time. The second option is getting a UV film for the interior of the dome. Of course, the challenge with that is applying it to a curved surface. My thought was cutting it into pie wedges and applying it that way? But if it looks crappy, well, that would be crappy.
Any other ideas? Needs to be something that can stay up there because I don't want guests to have to add or take off. Thanks in advance!