This is a good question, given the size of that disk array, and the 400W power supply. Assuming the PS is running at half-load, then you're taking 200W, and most of that energy is lost as heat. I've thrown a 15W aquarium heater into a 10 gal rez (out in my insulated, but unheated garage), and have seen the rez temp rise from mid 50's to 64F, in just a matter of minutes - If I only had, like, 2 gal in my rez, temps would rise much quicker! But OP is certainly correct, if you can "manage" to avoid running the humidifier constantly, then the rez will have some time to cool back down.
I turn on the heat and a circulating pump 15 minutes before turning on the feed pump for my dutch bucket system. From what I've read here, the nutes should be warmer than the mid 50's that I'm currently seeing in the rez. I run the feed pump for 30 minutes, and so turn off the heat 15 minutes before the feed pump. This thread is of interest to me because I'm fighting OTHER humidifier-related issues. I'm new to posting, and will start a new thread to avoid clogging up this one!
