Holy sh........ cow.... You gonna supply a zoo with feeders? What all you gonna have? Just find a way to regulate the room temp so it hardly fluctuates.... then put heat units on all your feeders that makes it a perfect temp, and you won't ever really have to adjust anything. Be easy to control room temp with a space heater or something if the room isn't too large. I for one, would never purchase $700 worth of thermostats unless I was planning on getting into the hobby of selling off insects. $700 is just way too pricey IMO to be spending if you are only feeding your own reptiles..... but hey, if you have the money, then go for it. And send some $$ my way.

Lol I am planning quite a few actually. Its actually quite the opposite of selling bugs that is why I am doing it. The room is connected to the cham room, so it will be semi heat monitored. However to provide night drops for the chams I need to keep the bugs heated.
I am considering ways to reduce it, but its hard lol. So sorry to derail but I will answer why I need that many.
So the plan is to have a 6 foot wire shelf rack, in which I will build cubbys. A cubby for each species

.
So the bottom 2 shelves will house roaches (and crickets if I ever decide to do them). There will be 4 bins per shelf as they need large bins, 4 kinds of roaches. Each roach needs to be on its own heat mat with its own stat, this is to prevent excessive breeding. If I have way more than enough dubias, I can turn the stat down so they will breed slower almost stop, if I need to ramp production I can raise it to 95. I can keep the heat mats on 24/7 to ensure 70 degrees for night drops (or whatever base temp that roach needs).
I will only have 4 species of roach from my current plan, so each gets 2 cubbys. However I wan the temp per cubby to be different. I dont want the baby roaches in the second cubby to grow quickly, as these will be my feeders and I want them to grow slow and fat (plus for babie chams that need babies to stay babies longer). So these cubbys will be set to 70 most of the time, however if I am getting not fast enough growth for a time I need to be able to ramp heat and with it growth.
So this accounts for needing 2 Herpstat 4s, 1 for breeders, 1 for feeders. This way all roaches are controllable 1 at a time, as my needs change.
Next shelves above. Dont need to be as tall, so these will be split into 6 sections (3 shelves, 2 cubbys per shelf). These will be for worms/beetles/isopods/other. Now do to similar heat requirements I can bundle a few species of Ispods in 1 cubby, These can be kept at 75 degrees, I can put my silkworms in 1 cubby, (this is another temp changer) superworms in another cubby, beetles share a cubby for a few species, flys share a cubby for a few species, and other (I am hoping stick bugs, but IDK yet) have a cubby.
This will require 1 Herpstat 6, I could likely run this from a Herp stat 2, as they really dont need as fine temp controls(each shelf can be controlled to 75, a herpstat 1 wouldn't work as the higher shelf will be hotter) and I may do that I am not sure.
Then on the side of the wire shelf, will be 2 wine chillers, 1 will be Compressor based and used at 39 degrees, for storing silkworm eggs and Butterworms, the other will be a cheap thermometric for storing horn worms, and slowing bugs down. (this is another 700 dollars lol). Then I will make an DIY incubator for silks, and place this on here as well.
So the price for the stats, If I go with 2 4s and a 2, that would be 339+339+195, so actually 900. If I go with 2 6s it would be 439+439 so almost 900, if I go with a 6 and a 4 it would 439+339 so 800 (cheapest option)
From a convenience standpoint and to better organize a 4+4+6 or 4+4+2 would be best. A 4+4 is also a possibility, assuming that each shelf has its own temp ranges (aside from breeding dubia) this is the least ideal IMO, as I can not change the roach nymphs temp individually, however that may not matter if I meet in the middle, so like 80 throughout the roaches, 90 for breeders (adjustable) and 75 for the top 3 shelves.
If I used a 4 and a 2, then I would have to figure where to place the probes, I could set the roach shelf to 80, but where do I measure the second? If I measure the shelf above the roach feeders the temp between that and the top shelf will alter by a bit, but how much? I could likely figure the difference and alter placement to suit it, but wouldn't it be easier to just spend the extra few dollars?