150 square houses residential houses are divided into several rooms, several halls and several bathrooms, a cabinet air conditioning is not enough.
If it is a large living room, or a conference room to use cabinet air conditioning 3 pieces of power need to configure two basically enough.
The average family living room of 40 square meters is very small. Configure a two point five male rate is OK. Each bedroom can be configured according to the area is better.
Of course, if you're bold enough, a central air conditioner is even better.
No, preferably central air conditioning