Welcome from WA! You will get about one egg per day per hen, if that helps in your planning. We have three, and they are super easy to clean up after, if that is a concern for your husband.
Chickens do better in cold weather and really suffer above 90 degrees. Shade and lots of air movement will be a necessity in the summer. You might do a search on "swamp cooler" for how to make this simple device and why it would be a good idea.