[Holger]

Heat is not a problem in Singapore. I resisted traveling there for a long time because I thought the heat and humidity would kill me, but wife won.
We went there and after one day I had no issues with the climate any more.
Also: all buildings, all transportation and so on has a very well setup A/C.

Remember to remain inside the building and close the windows when the "fogging" (killing insects) starts ;-)