I live in the desert in Arizona. I have a very small mobile home with 520 square feet of living space. My incubator is under my computer desk next to my feet. The brooder is a cardbord box setting in the bathtub in the bathroom with a heat lamp hanging over it.
I have learned so much about chickens.
The truth be told about chickens, from my perspective:
I have found that the incubator temps can vary from 97 degrees up to 101 degrees and still have an 80 to 85% hatch.
I have found that the humidity only has to be around 30 to 40% until they acutally hatch out.
I have found that you can leave the humidity at that low level until the moment they pip, and you can take a wet sponge, zap it in the microwave 30 secs to get it good and hot, open bator and toss it in. That will immediately raise the humidity to 85% and you will have perfect hatches.
I have found that the new born chick only really needs a lot a warmth for the first week of life. After the first week, you can start turning the heatlamp off during the day and they will huddle to stay warm if they get chilled during the day. But they need the heat lamp at night for 4 weeks.
I have learned that at the end of 4 weeks, I can toss them outside in one of the brooder pens I have fixed up in the run with the hens. They will be just fine out there at this age even at night as long as the temps are not below 40 degrees. After they feather out completely the temps don't matter too much as long as it is not freezing temps.
I have learned that I do not need to build a hen house, as they all live in their runs 24/7. The runs are completely covered with wire and poultry netting so nothing can get inside the runs.
We do have coyotes out here but the dogs keep them away and we have no problems with the coyotes.