In the dining room? IKEA makes affordable Vittsjo shelving units, and if you spray paint them with Rust-Oleum’s yellow gloss paint, you’ll get a similar look to the colorful metal bookshelves at Room and Board.
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.