When I first looked into the Cold Plunge, I wondered if it would hold its temperature through the hot (110°+) summers of Phoenix. Since my plunge would be sitting on my patio (in the shade), I checked in with Joe. He recommended going with the larger chiller, which I did. I started the build over Christmas break. I'm not a handy person at all. I didn't have some of the correct tools. I've never done any plumbing work before. The instructions were clear and concise. I watched each video one to two times before I would start that section, paying special attention to how things came together. Step by step, I completed the project. I'm 2/3 of the way through my first, hot summer, and it's holding steady at 50°. I would run it a bit colder, but my wife has started plunging as well, and she likes that temp. I'm surprised at how little the chiller runs. It has no issue holding temp during the hot summer months. I use it every day and would highly recommend the build. In fact, I have shared your site with many of my clients and friends while encouraging them to bite off their own project through your DIY instructions. Thanks for all the hard work so we could enjoy this!