you could build yourself a cold box out of 2x4s and insulation and mount a small air conditioner in it.....I actually saw on craigslist someone getting rid of 2 year old 5000 btu AC for $20.
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It may be normal. I don't know how you're set up but sometimes it takes a while for things to stabilize. If your previous tank was low (and why wouldn't it be if you refilled/swapped it?) then your regulator was likely putting out a higher outlet pressure than when your tank was full (this is normal, if inlet pressure decreases a lot, outlet pressure increases...to a point). If your keg(s) got carbed up to this level, then when you swap out the tank the regulator will go back to the lower pressure output but the 'overcarbed' keg will tend to slowly creep the pressure up. You may have to vent the keg a few times a bit to get it back down to your target carb level. In any case, try to take everything else out of the equation; i.e. use just the tank, reg, and close the reg outlet valve. Many of these regs are not self-venting so you may have to vent via a QD/poppet or relief valve whenever you reduce the regulator setting. Also, if you 'quickly' vent a line the reg will often overshoot on recovery (which might lead you to believe the pressure is too high so you reduce the reg, then it stabilizes too low). HTH.