Greener fact: repair historic windows…don’t replace
Contrary to popular belief, studies show that replacing old windows does not always improve energy efficiency and also wastes the energy and resources that went into making them. It also requires the use of new materials to replace them. When maintained properly, historic windows made from old growth wood have a life measured in decades, often in excess of 100 years. And they can be repaired. Modern replacement windows have an average life of 20 years, and usually cannot be repaired, but must be entirely replaced when they fail. And only 20% of heat loss at windows is through the glass.