Knowing how to replace a window can prove to be an invaluable skill both in terms of making repairs and saving money. However, single hung windows are often variety that requires extreme precaution and care regarding its setup and replacement. The entire method of single hung window replacement involves removing the existing sash, frame hardware and frame stops from the window while keeping the original frame in place. If the window frame shows bloating as a sign of water infiltration or cannot be damaged by any means, the above-mentioned technique should not be followed and the entire window frame should be taken apart.