I have a big igloo cooler I use that can handle 6+ clutches at once. Heat tape, proportional thermostat, digital thermometer. I use water jugs and bottles to help stabilize temps. No fans. The KISS principle works well for me. Humidity is always at or near 100%. You can see Pitt is running pretty much the same type deal. Water jugs for stability and I am guessing that the blue cup may be for humidity. Since his setup is taller than it is long my bet would be he is probably running fans in there too.
Humidity inside the tubs comes from the tub itself. I user a light diffuser with water below it. I do not put holes in my tubs. Humidity inside the incubator can be high to reduce tub humidity leakage. I have heard of people having corrosion problems doing this but I have not. I ran my incubator for six months last year and never had to add water.
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