Minimalist IKEA Cabinet Hack, and lots of other ideas on hiding a litter box. Not just for the litter box but for a dog's or cat's pet bed, when company is over or just during the day, just shut the door and it won't have to be seen until bedtime.
I live in the desert and it get to 118 in the summer. I don't know how many times the baby just didn't want to go in the car seat because it was too hot. A car-seat sun shade keeps the seat at a comfortable 69 degrees.