It's the best you can do with a portable air conditioner.
Anything else is a waste of electricity.
You should also convert the window to be able to close it airtight. This helps immensely to keep the cool air in the room.
Hard foam board Protex: www.bauhaus.at/aluplatten-kun...
Twin-wall panel ECO-UV 10mm: www.bauhaus.at/hohlkammerplat...
Twin-wall panel ECO-UV: 16mm www.bauhaus.at/hohlkammerplat...
7 июл 2022