Your question is so open ended that nobody wants to take a stab. However, I'm a glutton for punishment, so here we go.
First things first: economical versus reliable versus diy. A 500 square foot space isn't a massive one, but you can get a lot of money tied up in the system if you want to. Home vs commercial vs industrial gear. On the cheapest end, a sous vide immersion heater in a bucket, plumbed to a fountain pump on a thermostat could probably do you well. On the other, some pid controller and a cast iron industrial circulation pump and a steel box with plumbing fittings and pipe could cost a lot.
Please elaborate on your goals and the build level you want to employ. Digital fuzzy logic variability with bluetooth, vs one switch and internal "magic" operation.
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