Midea Inverter Window Air Conditioner with Heat – Quiet Window AC Unit and Heat Combo with Dehumidifier – Cools up to 550 Sq. Ft. – Energy Star Rated, Smart Control, Remote, 12,000 BTU

If you want both AC and heat, get one of these (link below). It's an inverter unit, so it'll be energy efficient. https://www.amazon.com/Midea-Inverter-Window-Conditioner-Heat/dp/B0GL6H2J7P/ I know someone who mounted this Midea in a thru the wall install. I have one in one of my windows. If you just want just AC, you can get an LG dual inverter unit. Edit: Inverter units can adjust their output power, so oversizing them isn't really an issue.

https://www.amazon.com/Midea-Inverter-Window-Conditioner-Heat/dp/B0GL6H2J7P/ Proved wrong with ease. Midea window unit with heat pump good for down to 41F.