I've never had any heat/humidity issue in nearly 9 years on the pump. I live
in Seattle, so heat/humidity isn't too much of a factor here, but I do travel
to hot climates -- including a beach house in Mexico where my pump has done
fine in extreme heat in the jungle!

I'm on the Disetronic D-Tron+, but the H-Tron+ has been trusty in Mexico
heat, too.

Whenever I'm in the sun, I do my best to protect the tubing and pump from
baking in direct sun. If I lay out in the sun, the pump goes in a breathable
bag
or under the chaise.

Alan



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