I live in a hot part of the country and run into this problem as well.
The following are the steps I take : (if step 1 fails, move to step 2 and so on)
Step 1) The door to the snake room is usually closed to take advantage of the heat put off by 8 large enclosures; so I open the door to let hot air out and cooler air in.
Step 2) Turn on ceiling fan. (If you don't have one, add a table top fan.)
Step 3) Turn the enclosure thermostats down, and dimmer if using a lamp.
Step 4) Last resort, I open the vent and turn the A/C on. Then readjust the enclosure thermostats.
It's all about subtracting and adding heat/ cold depending upon which direction you need to go.
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