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.
Electrical – How to calculate the Btus needed for a single room A/C unit
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Did you replace your original wooden windows with plastic ones? Many old apt buildings relied on imperfections in wooden windows to provide natural ventilation. New windows are more air tight and it probably makes the room stuffy.
Many casement windows have " micro ventilation" feature if you put the handle in a certain position. The leaves the window slightly ajar and provides enough fresh air.
Another option is to install a ventilation system.
A common method of equalizing the temperature across a room is to add a ceiling fan.
Cool air tends to stay near the floor, and a fan can be set to pull the air upwards. As it hits the ceiling, the air is pushed outwards to the edges of the room. Because cool air is heavier than warm air, it then moves downward, better distributing the temperature.
A very low setting can be used to avoid noise and strong air currents. This is easier with fans that have variable speeds, which is common with remote control types.
This technique is also used to circulate warm air for heating systems that need help with temperature distribution.
SUPPLEMENT
The ceiling fan should be placed near the center of the room. Most fans are reversible. The fan should be set to blow upward, if possible.
Floor fans can also be used.
Similarly, a pedestal fan.
If using a floor or pedestal fan, place near the air conditioning flow and direct the fan upward and toward the other end of the room.
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Best Answer
I found this link, which is for a whole house: http://www.northernac.com/newcalc.htm
This one is for a single room. Assume the room direction is for the northern hemisphere. Reverse North and South if you're in the south. http://www.bhg.com/home-improvement/advice/measuring-materials/window-air-conditioner-size-calculator/>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