Cross 450kWh in July or August and the standing charge on a Korean household electricity bill jumps from 1,600 won to 7,300 won. Here is how to derive an air conditioner's hourly draw from its CSPF rating and price it against the three summer tiers.
Air conditioners are chosen by cooling capacity in kW, not floor area. The Korean standard is 400W per pyeong, with a 1.3x correction for living rooms.
The inverter vs. non-inverter electricity bill gap comes from the compressor: one modulates output, the other just switches on and off. This post explains which structure loses under which usage pattern, covering spec-sheet reading and the basics of calculating your bill.