Would like to ask your opinions regarding House Airconditioning system. I'm planning to buy a new aircon and im choosing between the Window type and the Split type units. A friend told me that a split type aircon may be a little expensive but will eventually offset on the long run since it it more economical on electric bills.
Need your inputs about this.

Another thing, which is easier to clean and if i chose the split type, can i do a DIY cleaning? Di ko pa kabisado how to clean it or do i need to get the services of the shops?

Lastly, which brand is the best, the one that's coolest and durable? My thoughts are with either National brand or Carrier. Also considering Samsung and LG.

By the way, lets stick to 1HP, 4x5 meters ang room,concrete walls