I've been told that window units are not as efficient a Central AC and that cooling down one room with a window AC might cost more than cooling down the whole house with a central unit.
Is that true?
Because I wanna cool down my bedroom (10x14) during the day. I sleep during the day (night shifter) when the rest of the house is usually empty.
When it gets to 100 outside, the Home's AC will only cool the place down to 90 at the most. And that's with the AC working at capacity (very high bill).