If you need A/C try to look into the "inverter type" split AC units. they are more expensive than the regular split AC units, but save up to 40% of energy. My 12000 BTU regular AC split units runs at 1200 W, so running them 10 hours a day (7 hours home office, 3 hours bedroom at night) results in about 350 kWh usage per month ... that is about 2800 pesos, or 70 dollars, PER MONTH. I have a separate meter for AC only. If you use inverter split type, you can easily save 30-40% off that. Also, January through mid-march my AC was practically turned off, no need for it, in those 3 months I ran maybe 30 kWh in total.