@trinsec The circuit is too old, and it's poorly designed. 5 houses share the same circuit and breaker. Two of them installed AC, and the circuit breaker is very likely to pop up when they are both powered on and doing the work. Those houses are built around 199X, I'm not sure when but it's in that range. The electricity is poorly designed (we have very limited wall plugs, and we used an extension cord to power the AC, which I think is high not recommended and risky), I don't understand why. Maybe people don't need five chargers to power their phones, laptops, and other fancy things back then? XD

@skyblond Heh, my house is from somewhere 1960's or a bit earlier. So the age doesn't matter.

Quality of the electricity circuit, however, yeah that does matter. Though I cannot imagine a house here that cannot support AC...

Can't you and your neighbours team up together and order the circuit to be fixed?

@trinsec That's complicated. Our house is part of a historical building, it should be protected, but due to some unknown historical reason (possibly because of the "Cultural Revolution". During that time, a lot of historical building was split and turned into civil living houses), my family lives here, and I was born here. The main breaker is not located in my house, and the main building was built around 1925, I don't know when they improved the electricity(or just left it there forever). But every time the breaker pop, it's not the breaker in my house, nor the other 4 house, it's the main breaker in the old building. We tried to contact the institution that takes charge of the building, but seems like it's already a cultural relic, and will be really hard to get approval to update the circuit.

@trinsec I know there is something like a huge power bank that stores energy when people are not home and boosts the powerline when people need it. But I'm afraid those old wall wires will overheat and catch on fire.