The average replacement window can cost from $300 to $700, which is why many homeowners see it as an unneeded expense. As long as the window is there and keeping the bugs out, why spend the money? However, old drafty windows can actually be costing you way more than what a replacement window will cost you. Windows that allow air to escape may be costing you anywhere from 10% to 25% on your energy bills. Old windows cause the house to lose heat in the winter and lose cool in the summer causing you to constantly run your heat or…