Quote Originally Posted by escaped
The post of my calculation was more directed as to show that a 15-16000 Btu unit is way to small for a 36 mē sized room.
Maybe, maybe not. Here's what I have in concrete red brick wall, three meter high ceiling with ceiling insulation. All outside walls have foliage provide shade on walls 90% everyday.

Three air cons in house all doing a good job cooling the room.

8x8m (64sqm) = 15kbtu. Three large sliding glass windows and one large sliding glass patio door.

4x7m (28sqm) = 10kbtu. One large sliding glass window.

7x13 (91sqm) = 16kbtu. Three large sliding glass windows.

So you guys calculate your hearts out. This works for me.