In a couple months I'm going to be moving from a cold temperate environment where the sun is only out for a couple months a year to a sub-tropical state where with short exceptions it's sunny and hot ...
Check that your air conditioner works, and that the fridge is set up and operating well.
The only real maintenance difference I can think of is that UV damage will happen more quickly, so tire covers might be a good idea and expect plastics etc. to degrade a little faster and things to fade more. The batteries might need water a little bit oftener as well (if they're flooded batteries).