Are they more power-hungry than heat? A window unit can be used in the room you sleep in, and if you've done a reasonable job at reducing leakage and insulation

Are they more power-hungry than heat? A window unit can be used in the room you sleep in, and if you've done a reasonable job at reducing leakage and insulation , and reducing light ingress (external shutters, etc.) can be pretty efficient. Even in San Diego with the sun bearing down on my flat we managed to have a pretty low load factor on our window AC to keep it around 24-25C at night.