Was thinking about for the green house this fall/winter....IT is on the southside.
I’ll be honest with ya, if you are in the mood to grow cactus, I’d rather see you do it in the house. Most homes have enough dryness to avoid killing them.
Remember the old rule about watering a cactus: You water only when it’s raining in Scottsdale.
:) (and yes, that means almost NO water in the winter!)