Aircon costs
I tested going ONE MONTH without AC
July usage 357 kWh
August usage 237 kWh
I saved about 1,100 pesos in total, or 17 USD
Context
Single guy
60 sqm condo
2 AC units
I only use dehumidify mode at 28°C
Bedroom only at night, door closed
Living room only around midday, all other doors closed
So based on my test, running AC doesn't cost that much more.
The actual electricity charge isn't much, it's all the other charges added on that make up a big chunk of the bill..
Put two months of bills side by side and compare what each line item costs.
FYI, this was before the rate reduction the government set for August and September.