Well done Ray! I love that you go all out with this!! so cool!
I have two comments though.... just trying to be helpful!
1st is the humidity in the brooder, dont worry about that as thats an incubator worry not a brooder worry.
2nd if you end up having temp spikes or ALOT of variation with that hot water heater thermostat because it READS radiant heat NOT ambiant... I wrote about three kinds of thermostats in this article, it will explain them if you dont know that is and the first one is cheaper than a hot water heater one. http://www.backyardchickens.com/a/incubator-incubator mind you this was written for an incubator.....
YES you NEED ONE!
Thermostats are easy to install!
What is a thermostat and why do I need one? A Thermostat is a temperature-sensitive switch that controls space conditioning, in this case heat! When the temperature drops below the thermostat setting, the switch moves to the "on" position, and your heat source runs to warm the air to the setting you selected and then shuts the heat source off when temp is achieved. Thermostats can regulate ambient (area temps) or radiant heat (at heat source) and some even have a probe.
Steady Temperatures are EXTREMELY important during incubation!
Please refer to: Hatching 101 ~ Temperature Section
GREAT thermostat and it’s cheap, about $14. And it includes a probe that you will set at the level of your eggs in the incubator. You can find them here: Digital Thermometers Digital Thermostat and Solid State Relay Wiring Diagram found here Wiring Diagram Video No matter if yourDigital Thermostat is 12Volt DC, 110Volt AC, or 220Volt AC; you will still need the SS Relay and an AC/DC Inverter. The wiring scenario is still the same.
GREAT thermostat and it’s about $24. Make sure you get the “Assembly” and not just the wafers (see pic.) Wafer thermostats are the most used in incubators because they read the temperature which surrounds your eggs, not just the heat coming directly off a light or heater.
You can find them here Wafer Thermostat Assembly
Please refer to wiring diagrams for either single or double light fixtures in this VIDEO (scroll to bottom of link page)
See the little Allen wrench thing from the wafer thermostat?
It is marked which way to turn up!
Above you will notice that an extension cord is cut through for wiring the thermostat and lamps and is the only input of electric to this unit. Below you can see the fan plug is then plugged into the extension cord.
HOT WATER HEATER Thermostat
DO NOT WASTE YOUR TIME with a hot water heater thermostat!
These have a lot of variance in temperature since it reads RADIANT heat directly from the light bulb or heat source. When we installed ours it was almost touching the light bulb and we STILL had over a 2 degree variance in temps. HOWEVER, IF you ALREADY purchased a hot water thermostat here is the diagram to install it. REMEMBER the closer to the heat source the less variance you will have with this type. You will have to keep adjusting the unit closer and closer to the bulb until you have reached the best temps with as little variance as possible. AGAIN, PURCHASE one of the other two Thermostats as they are well worth it!
Please refer to link: Hot Water Heater Thermostat Wiring Digrams