I have three of them and they are all getting the job done. Keep in mind, they are the on/off type of thermostat. They shut off when they hit a specific temp threshold and they turn on when they hit another. There was another member here who got it and said they sucked because they didn't know how they worked. I have mine set to 92 and it generally turns on at 89 and off at 93.5 F.
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