My classic (smelly) green shirt has been retired after seams started giving out. Looking for a loose-fitting replacement though not sure if better to have cotton or synthetic. In any case I expect to sweat into whatever shirts I bring -
Have you tried silk? Last month in Guatemala it was 105 or so every day in the jungle. My silk shirt got more use than my cotton or wool shirt. A ceiling fan or any fan is healthier than an air conditioned room. 30 or 40 degree drop in temperature is not healthy. When you make the adjustment to your new environment, which takes time, you will be fine with a fan.
What about Venezuela? I would be interested to hear about this journey, as, I will be the northern part of western South America in a few months.
What did you decide on for a new bike?