Glad to see more OC folks on the list!
Another thing to keep in mind is the Santa Ana winds. With an open coop, you do take more risk that the winds will be problematic for you, unless your coop is situated on the side of the house that is blocking the winds.
Although I'm only a few miles from the ocean, and therefore not as warm as you get in Anaheim, I do have an enclosed coop and a covered run. Here's a picture of my coop that contains three chickens.
It was made from an old playhouse that my kids outgrew. There are two windows - one opening to the run and the other you can see in the front with the shutters. The windows are covered with hardware cloth and the shutters on the front does a nice job of keeping the rain out. Their food is mounted on the wall right below the window and has never gotten wet.
As you know, even though we don't get a lot of rain here, it sure can come down hard at times!
The block wall to the right blocks the Santa Ana winds.
I don't believe you'll need any insulation if you can close off the coop at night. With the shavings inside, they stay pretty toasty and they will snuggle up to one another.
When it gets warm, I do things very much like Xtradust. In addition, I fill empty gallon milk jugs with water and freeze them. A couple of those in the coop and/or run can help bring the temps down.
Xtradust is also correct about the critters. I've seen pretty much all of them in my area and although I've not seen a coyote, a neighbor lost a cat to one a few years ago.
Another thing to keep in mind is the Santa Ana winds. With an open coop, you do take more risk that the winds will be problematic for you, unless your coop is situated on the side of the house that is blocking the winds.
Although I'm only a few miles from the ocean, and therefore not as warm as you get in Anaheim, I do have an enclosed coop and a covered run. Here's a picture of my coop that contains three chickens.

It was made from an old playhouse that my kids outgrew. There are two windows - one opening to the run and the other you can see in the front with the shutters. The windows are covered with hardware cloth and the shutters on the front does a nice job of keeping the rain out. Their food is mounted on the wall right below the window and has never gotten wet.
As you know, even though we don't get a lot of rain here, it sure can come down hard at times!
The block wall to the right blocks the Santa Ana winds.
I don't believe you'll need any insulation if you can close off the coop at night. With the shavings inside, they stay pretty toasty and they will snuggle up to one another.
When it gets warm, I do things very much like Xtradust. In addition, I fill empty gallon milk jugs with water and freeze them. A couple of those in the coop and/or run can help bring the temps down.
Xtradust is also correct about the critters. I've seen pretty much all of them in my area and although I've not seen a coyote, a neighbor lost a cat to one a few years ago.
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