How many Btus is recommended for a room about 35 square meters? I have 2 units with 13,000 Btus each. I'm thinking it should be enough, but the room is just so-so cool. I can never say it's COLD in the room.
I found this link, which is for a whole house: http://www.northernac.com/newcalc.htm
From the comment by mike:
This calculator is a bit better in that regard, but does not take into account climate: thisoldhouse.com/toh/calculator – mike