Had a heat wave this past week with weather in the 90s and it's only May. Which I'm ok with except my tank was reaching temps of 86 and had me worried about how my rays would be able to cope with this all summer long as it's only may and it's already that hot. So I got a 10000 btu wall unit for my 305 sf garage. All sides are insulated expect the side the windows on . So far it had the garage down to 75 degrees in a pretty quick time. Hopefully it won't kill my electric bill to bad but oh well . Be interested to hear if anyone else has down something similar in a garage / fish room or how they cooled their tanks if they had high temp issues too.