Will morning greenhouse heat cause damage to my plants?

[BrassavolaStars]

Hello all,

I think I may have posted about this topic before, but some new developments have occurred. My greenhouse has been getting fairly hot in the morning but quickly cooling off in the afternoon.

I bought automatic roof vent opener to solve this problem but did not realize that they weren’t working and the temperatures in the day between 9:30 and 12:30 have been getting to around 98F before quickly dissipating to 82f by 2:00pm.

This has been going on apparently for a few days. Is this likely to damage my plants?

None of the plants are in direct sunlight and there is a fan constantly running. About half of my orchid are brassavolas and cattleyas so I’m not concerned about them and another third of my collection is split between Dendrobiums and oncidiums.

I am mostly worried about the miltoniopsis which may be showing some minor stress signs pictured below. Sorry for poor quality as I am using an old iPad right now. The lines in the leaves are quite visible on some leaves if that makes any sense. I am also concerned about the Angraecums.

Should I be concerned that these orchids have been damaged by heat or do they look mostly normal and not to worry?