This works perfectly to cool my bedroom without making the whole house too cold.  I like to sleep in very cool rooms, but the rest of my family doesn't share this preference.  Instead of making the whole house cold, I can now isolate it just my room with this little air conditioner.  The room is about 12 x 15 and it cools down in under an hour on a hot day.   I like the quiet operation and the easy installation, I was up and running within an hour.