initial cost: cheap (you can get a decent one for 12k below)
operating cost: average (electricity bill averages usually 4k)
maintenance: cheap (cleaning just cost 500 pesos)
reliability: good (my panasonic AC is 4 years old already, still cool even at 20 degrees; prior to that, our condura AC lasted 9 years)
initial cost: expensive (besides the AC, the compressor is another one to buy)
operating cost: cheap (average bill from my friends are around 2k with refrigerator and other appliances, around 3.5k)
maintenance: expensive (cleaning is 2k)
reliability: varies. if the placement of the compressor and AC is done by a good company, it can last for a very long time.