Pump Overheating and Shutting Down

[BradWilson]

Greetings all from Snowy Northern Vermont.

I bit the bullet this year and bought a new CDL 1hp vacuum pump (they make their own instead of using Airtech). Anyway, my vacuum shelter is mobile. It's 6' tall, 3' wide and 6' deep. It's insulated with 2" blue board all around. It houses my electric releaser and pump and the new vac pump. The vac pump is wired to a contactor and Johnson Control thermostat. The problem is that the vac pump motor keeps tripping it's thermal protection. I'll go over to check on the pump and it will be out on reset and the shelter is warm inside. I've checked all the voltage and amperage and they are dead on. So the only thing I can come up with is that the shelter is getting too warm and the motor is kicking off. There is chicken light in there too keep it warm at night so the releaser and pumps don't freeze. So........

I need to come up with a way to ventilate the shelter without having to go over there every morning and every night to open and shut the door and reset the pump. Has anyone set up a ventilation system for the same reason? I'm thinking a bathroom fart fan with louvers or something of the sort. Just not sure if the CFM would be enough to keep the shelter cool. Lemme know. Thanks in advance. Sorry about the sideways pics, I can't figure it out.