I installed 1hp Mitsubishi Mr. Slim on my small room 4m x 4m, even I turn to 16C with full fan speed, it hardly get very cold, it just feel little bit cold,don't know what happened, just installed on Jan 2014, same thing happened on my other 2 small rooms.

But in my master room I installed the 1.5hp inverter type Mr. Slim, I only turn to 26C, fan speed half, it is quite cold. this 1 I very satisfy.

but for the 1hp non inverter type seem not so good...

ohh....so mean that 4m x 4m room need 1.5hp only enuf?