Corinthian will be responsible for the bill due to the fact that the fans are in operating conditions from what I can tell. Shower fan will not come on by the switch. Shower switch actually turns the light and fan off to the toilet room. Concerns for bathroom fan being loud are believed to be caused by the fact that with the shower switch off the bathroom switch will not cycle the bathroom light or the fan unless you turn on the switch at the shower. They said it never made noise prior and now it seems louder than before but that’s because it only works with the shower switch on