All this talk of hatching is making me want to go buy one of these and get started! I was looking on amazon at some... any suggestions? Are they all equal as far as quality?
If you are asking if all incubators are created equal, the answer is definitely "no". If you are wondering about the
Brinsea brand, I have heard mostly good things about them. They are fairly pricey but all hobbies are pricey, no?
For what its worth, I am very happy with my home-built, that cost me almost nothing. Unfortunately, that wouldn't be the case for everyone though. I also keep herps and had some of the materials just "lying around" that wound up being perfect for the job. If you are interested though....
For the sytrofoam cooler, I heard that Omaha Steaks coolers are superior because they are super thick. I have never ordered from them but figured someone in the area probably has and doesn't need the cooler their meat arrived in, so I placed an ad on Freecycle and was gifted with two coolers, one a little taller than the other.
For the heating element I used a reptile heating pad. These come in various sizes, and are a flat pad with a heating element wound through it, used to adhere to the bottom of a glass aquarium to keep a snake or lizard at the right temperature. I found I had one that was only slightly smaller than my cooler so takes up most of the bottom (flat as a piece of cardboard though, so its perfect - doesn't really take up any space and yet warms VERY consistently since the heat is coming from the whole bottom).
For the thermostat, I used a reptile thermostat I already had. I have found it is awesome at maintaining a perfect temperature, cycling on and off more often than the hot water heater thermostats do.
For a fan, as mentioned earlier I tried a computer fan but couldn't get it to work so I broke down and bought the Little Giant Incubator fan for $35. I already had the wire nuts (thanks, Danz, for reminding me of the proper name for the "little plastic thingies you use to connect wires) and had no trouble finding an old cord to attach it to - that part took only minutes.
Back to the cooler....I made a large hole near the bottom on one of the ends, out of which I threaded the cord for the heating pad and the cord for the fan. I also used a pencil to make three ventilation holes on each end just at the top of each side. (For ventilation, the fan, sitting at the bottom and just inside the big hole, draws air in and vents it out through the six smaller holes at the top).
I went to the thrift store and bought the first 8x10 picture frame I found that had intact glass. Then I went home and traced the glass onto the lid of the cooler. I then cut out a rectangle of styrofoam about 1" smaller all around than the glass. Then I was able to cut out to allow the glass to sit flat on the styrofoam and fit in much like a picture frame. This turned my whole lid into a viewing window.
The incubator is now ready to go.....
At the dollar store I bought a couple of little dog bowls, and a couple of wire racks. The dog bowls sit on top of the heating pad, the wire racks sit over them, a rectangle of 1/4" hardware cloth cut to fit the cooler sits on the wire racks, a piece of rubberized shelf liner sits over the hardware cloth, and the eggs sit on the shelf liner. It is easy to pull back the shelf liner and add water when needed right through the wire racks and hardware cloth. I add warmed water, so the little heating pad doesn't have to warm water from cool.
It took a little adjusting to get the temperature where I wanted it, but once I did, I found the incubator stays at an even 99.5 with almost no variation. The thick walls of the cooler hold both temp and humidity very well. I can open it 5x a day to turn eggs and it recovers almost immediately. My last hatch was 100%, the one before that 9 out of 10 eggs hatched, so I'd say its working pretty effectively
Of course, if I had to go out and buy all the components, I'd be spending quite a bit so it only worked for me because I already had them, but there is also a lot of satisfaction in getting a good hatch out of home-built.