In our house we have housemates and we are frequently debating over ways to conserve electric usage in order to reduce our bill. Our latest debate is about leaving the bathroom fan on constantly for ventilation. One housemate likes to leave it on all the time while I contend that you should only keep it on during and after a shower or other activity. Since the temperatures are in the 90’s right now, I know that for all the air that is pumped out of the house by the bathroom fan we have to A/C the new air coming in. I think a typical bathroom fan blows about 80 CFM so that means we would have to A/C an additional 115,200 cubic feet of air per day!
I want to calculate how much this is costing us but I don’t know how much a typical A/C unit blows in cubic feet per minute nor how much electric one uses. Can anyone give a rough calculation using a standard size A/C unit in Florida for a typical 3 bedroom suburban house? It would also be nice to know if anybody here leaves the bathroom fan on all the time and why.