That humidity/temp controller will only run a humidifier/dehumidifier or the fridge/heater... one of each, not all four. I have it running my "winter" curing chamber that only needs to be heated up to 55 degrees and dehumidified. If you will need to heat your chamber part of the year, cool it another part, humidify it at times, and dehumidify it at other times, then you should get one controller that can do heat or cold: https://www.amazon.com/Inkbird-Temperature-Controller-Thermostats-Germination/dp/B019Q3K4EI/ref=sr_1_4?ie=UTF8&qid=1489682368&sr=8-4&keywords=inkbird

and a controller that can humidify and dehumidify: https://www.amazon.com/Inkbird-Dehumidification-Humidifaction-Dehumidifier-Charcuterie/dp/B01FQKXRXA/ref=sr_1_15?ie=UTF8&qid=1489682368&sr=8-15&keywords=inkbird

If you make a lot of product in one session, you will probably need a dehumidifier: https://www.amazon.com/Pro-Breeze-PB-02-US-Electric-Dehumidifier/dp/B01DC5PPWM/ref=sr_1_5?s=home-garden&ie=UTF8&qid=1490184197&sr=1-5&keywords=dehumidifier

When you hang 10+ lbs of meat in a fridge, that humidity is going to shoot up to 85+% even if you are in the desert.

I know that a fan is a basic and common component, but I've never put one in either of my chambers. I open the door every day to check on things and am constantly adding and removing product from the rotation... I haven't really had any problems yet. I don't think it would hurt at all to have a fan in there, though.