Thanks! I am, actually, thinking about how I can add another coop and extend the run and link them all together....in a manner that won't break the bank or blow my husbands mind

I thought the most I wanted was 4...built for 5 and ended up with those roo's...so now at 3 (we are a family of 4 so probably the 3 will give us enough eggs but 4/5 would absolutely give us the eggs we need) But I'm thinking about this...we'll see
Chicken math is already at work on you!

Your first chicks will always be special to you, in my opinion. My husband, not a big fan of the chickens at first, is now against my culling some older girls who are not doing their job. We got new chicks this spring, now he says, OK, lets get rid of no tail no lay hen! The new chicks are not as special, now, either!

Some hens are just not as good a layer as others. (He still will not eat those birds, though).
I love the electric netting from Premier1. You can change the run so easily. You can split the run, or make it bigger. Extra posts are $2.00 at
TSC.
For a family of 4, you might want as many as 8 hens, once you get to loving eating those home-grown eggs! I gave one of my neighbors 5 pullets, that seems to be enough eggs for their family of 2 adults & 1 small girl. Welcome to our world of chickens! I plan to get new chicks every spring, every year of my life for the remaining years granted to me! I love chicks! So, you might want to wait and get new chicks next spring, as some others have recommended here.

As far as heat goes: I am a former Californian from Riverside,CA. Hotter than you. I used misters when I lived there, back in the 80's! Now, it is hotter. I did not have chickens for many years because we lived in Palm Desert, too hot. We moved to Prescott, AZ. Now I have chickens again and I love it! But, the heat tolerant birds I got from a breeder member in Phoenix, are my best layers this hot summer. Never skipped a day, which my other birds have. I would recommend that you look into the Naked Neck birds. They are very hardy, heat and cold.
@BlueBaby bred my best girls, big green eggs and lots of them! Here are some photos of them as chicks and adults.