How do you keep your equipement cool at tower sites?

Does anyone have a source for cheap air conditioned outdoor cabinets? Most of our sites have been setup using metal truck toolboxes modified to fit our needs but now that I’m using routers I can’t keep anything cool. Were in the desert where 100 degrees is very common. I’d like to start buying some professional air conditioned boxes, but I need a very good price to convince my company. I don’t even need a large box, most of our sites have 1 routerboard, a couple of car batteries for backup, and maybe a couple power supplies for various hardware on the tower.

What are you guys using?

Were using hoffman boxes we picked up recently. 2 - 6" fans in a 30 x 12 x 24 box

We’ve opted for some outdoor metal rack enclosures and we’re going to try putting portable air conditioners in them and vent the exhaust outside. We’ll see how it goes. Metal boxes with ac are pretty expensive, portable units are pretty cheap and easy to replace.