With the rising cost of electricity, is it still viable to invest in an air-conditioning unit? A 600-watt inverter split-type air-con used for about 10 hours per day would increase your electricity bill by about Php2,400/month not to mention the initial investment of around Php30,000 for a 1HP unit.
I think this boils down to how much money you can afford.
It would be interesting to know how much you're pay for your air-conditioning unit and the brand/model to help others in their purchasing decision.
The DoE has a website that would help you manage your electrical bills. You can visit their site at http://wattmatters.org.ph/