We installed a window air conditioner two days ago. Unit operated fine with no problems up until yesterday when it began tripping the circuit breaker. The unit is 120V and is the only thing plugged into the circuit (We have unplugged every other single item). The tripping of the circuit happens only during the hottest parts of the day. It is 115 in my area today. The unit works fine but it seems to be an issue on extremely hot days. Please advise.