I am looking for an air con for the bedroom on the first floor. The room is about 16.5 sq M, height is about a a shade less than 3M. I get the sun on the house from about 9am to 4pm. I will only use the unit at night with a temperature around 22-25C. The safe bet is the 12000btu but with low usuage would the 9000btu do the job anf if so what make is recommended, I am being shown Mitsubishi or if I want to save money Samsung. Thanks for any helpful suggestions.

My bedroom is 20 sq/mtr and a 9,000 bthu air con. Switched on in a hot room at 10 oclock it cools to 27C in 10 mins.

So I would'nt think a 14,000 unit would be nessesary.

You will find that the smaller units are 2-3000 baht cheaper as well.

Thanks that is what I was thinking, not bothered about an inverter but are Mitsubisho worth paying a bit extra over a Samsung?

if you buy to large a unit it will shut down when the temperature is at the set level, but before the humidity has been extracted sufficiently. Mitsubishi at the moment I think.

Our bedroom is 17 sq M and we have a Panasonic 13,000 btu Inverter. Cost about 18,000 BHT last year. Running overnight 9pm 'till 8 am. Total house electric consumption at the moment (very hot) about 10 to 12 units per day.

Thanks that is what I was thinking, not bothered about an inverter but are Mitsubisho worth paying a bit extra over a Samsung?

I don't know about Samsung but have had many Mitsubishi and very happy with all sizes. For you, the 9K is more than enough.

Gentleman, thank you all for your helpful suggestions, have a cool night!