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If you have a big grow where multiples of those would be needed, then it isn't really cost-effective over a good chiller. Otherwise, for a "hobby" grower, I think this could be really useful. I can't imagine it produces much heat. I use a CMH myself and since my cab temps are usually only 2F over my ambient, I am not worried. I'm not going to buy one anytime soon as I am broke and am setting up a new 18 gal DWC, but thought I'd share the idea.