Hi,
There are other way's to cool a tank...
I use small fans on one tank which keeps it a little cooler, although it increase's evaporation.
On another tank i throw in a couple of frozen water bottles to bring the temp down.
One way to tell for sure is to leave a bucket of water in the area where the tank will be and then test the temp over a few days to see how far it rise's.
Regards, Simon.