[Supercharger]

Hi,

I'm new on this forum and have a question concerning endothermic reactions.
i not experienced in chemistry at all so that's why I'm posting.

Anyway,
I need to know which endothermic reaction is easy to produce, effective and last long.
the idea is to extract heat/cool air lines as much as possible. (the air is hot/warm)

I have no idea how effective and long lasting endothermic reactions can be.
Preferable it lasts very long not sure how long this can be, also the reaction should be not to expensive to start and keep supplied with compounds.

Also it can't be anything explosive or highly flammable.
Thanks!