I heard that the PH meter sucks on that thing. is that right?plant leaves droop when over watered too....you need to buy a moisture meter >> sold at home depot > http://www.homedepot.com/h_d1/N-5yc1vZ1xg5/R-100325514/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053
that meter also has a PH meter & light meter..its kickass
my grow room gets above 90 degrees sometimes, as long at you have air circulating they will be okay, & yes, the water does evapoate fast when with that much heat