an adapter to maintain power may include a first switch to connect the power to a building , a first relay to cooperate with the first switch ; a second switch to connect the power to the building , and a second relay to cooperate with the second switch . the building may include a high - voltage air conditioning system , and the first relay may be spring and solenoid operated . the second relay may be spring and solenoid operated , and the adapter may include a closable housing . the first switch may switch between building power and a generator , and a second switch may switch between building power and the generator .