I don't think it's a simple question, too many variables.
How hot is "very hot?"
Does the system run hot now?
Will your mom use the system in the same manner...for as long...as you currently do?
I'd be more concerned about humidity (I've been to Panama) than I would heat.
Worst case...remove the covers, place a small fan near and let it blow in (as so many do) if it shows signs of overheating.
If you're really concerned about it, I imagine that you would ensure that a most appropriate set of fans are installed, in an effort to reduce the likelihood of system overheating. Doesn't cost a lot.
As for case fans...it's more important that they are blowing in the proper directions...than just overloading a case with fans that impede, rather than facilitate, the flow of air in the system. Generally speaking...upper fan in PS blows hot air out, lower fan in front of system pulls air in. You'll have to read up for others' opinions
I find that removing the case covers is my solution, although I don't do it for cooling purposes.