The electricity consumption of an air conditioner depends on its capacity, type, usage hours, and energy efficiency rating. As a rough estimate in the Philippine context, a 1.0 HP non-inverter unit running for eight hours a day consumes approximately 4 to 5 kilowatt-hours (kWh) per day, while a comparable inverter unit may consume 2.5 to 3.5 kWh under the same conditions. To calculate your monthly cost, multiply the daily kWh consumption by your local electricity rate, which averages around PHP 10 to PHP 12 per kWh in many parts of the Philippines, and by the number of days of use per month. Choosing an inverter unit with a high energy efficiency ratio (EER) and setting it to the recommended temperature of 24 to 25 degrees Celsius are the most practical ways to reduce air conditioning costs.