Why your electricity costs double

The state electricity authority charges homes roughly 4–5 baht per หน่วย (kWh). Many apartment buildings, and some condo landlords, bill tenants through their own meter at 7–8 baht a unit, and charge several times the state rate for water too. It's common and usually legal, and it changes the real price of a room: an aircon running every night can use a few hundred units a month. A condo unit with its own meter from the electricity authority pays the state rate directly; an apartment block usually doesn't. So before you sign, ask ค่าไฟหน่วยละเท่าไหร่ and whether the bill comes from the building or the authority. Then set the aircon to 26 and use the fan.