Does leaving the window opened increase my utility bill?
That absolutely depends upon the conditions. If its hot and youre running the air conditioning, yes it will. If its cold and youre running the heat, yes it will. But if its nice outside and youre opening the windows instead of running your heat or air conditioning, it will lower the bills instead of raise them. Lowering the utility bills is a very simple matter of using less utilities, using them more wisely, and finding ways to cut back. Under the right set of circumstances, opening the windows is one way to avoid turning on the air or the heat.