If you’re looking to save money on energy bills by replacing your drafty windows, I think you’ll find that repairing your old windows will save you even more. This is especially true since the life expectancy of new windows is only 15-20 years.
Although old windows can have lots of drawbacks: broken glass, poorly operating sashes, wood damage, worn jambs. These problems are the simplest, most cost-effective to fix. Old wood windows were built to be repairable. Original wood windows made prior to 1940 are constructed from the heartwood of original growth lumber. The extracts that collect in the heartwood make it richer in appearance, more decay resistant, and more stable. This valuable wood is no longer available today.
Repairing and maintaining wood windows is less expensive than replacing them. So, if your windows need attention, do not replace them. Preserving original wood windows is better for the environment, saves energy, and maintains the architectural integrity of your home.