I got one last year for a room that gets beat in the sun! It was a bit pricey but I remember they had three kinds that went on room size. I got it from Lowe’s and it hasn’t made my electric bill skyrocket.
Hisense 7500-BTU DOE (12000-BTU ASHRAE) 115-Volt White Portable Air Conditioner
Key to success here is to get a solid seal with the window. Duct tape! Pro tip - if we get wildfire smoke again, you might be able to convert your portable AC into a decent air filter just by taping on the filter.