Well, any kind of blanket or cover won't really do anything except to protect from immediate radiant heat. The whole machine will still rise to the ambient temperature in the room. I think the real question you need to answer is what's the max temp the machine can sit in safely. Id think 100 degrees is safe as they must be designed to work in hot climates. But I think the bigger concern is the range in the flux in temperatures.

That's for electomagnetic radiation, not heat.

There's a heat shield material that looks similar, though.

It's hot alright, however I wouldn't worry about it as these machines when operating with all the lights and electronics will heat up to a temperature higher than what we will see today. If you are worried just leave them off until it cools down outside a bit.

Shades always seem to work...

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That heat is probably ok (it can get really hot inside the cabs of some these machines, so think they can handle it). Are you going to play it at that temp, or just have it in the same room?

I'd be more worried about humidity changes over temp, though not sure if you're saying it will drop to upper 20s, or is that somewhere else?