1. Primarily, because your windows fit your house.
Quirky as they might be your older windows fit your house. Homeowners and construction companies take care to match the weight and style of window to the building, the trim, etc. They have expanded and contracted with the seasons. With proper weather stripping they can be made to fit and seal even better. Replacement windows have a rigid structure that fits within your window openings. Old houses move and shift over time and frequently the gaps that open up around replacement windows and the window openings result in more drafts than the original windows.
2. You appreciate good craftsmanship.
The true mortise and tenon construction of antique windows is incredibly strong and even when it begins to weaken it is easily repaired. Many unique window shapes were created because of the craftsmanship with wood joinery. Antique windows were built to last, to be repaired as needed and to remain in use for as long as the house might stand, not to become landfill.
3. You value good materials.
They constructed wood windows with old growth timber back in the day. So, if you have antique wood windows, chances are the wood is denser and more weather resistant than today’s tree farmed softwoods. Delicate profiles are possible because of the density of the wood. The reason these windows are still around, even with years of neglect, is because the wood is of very high quality requiring no cladding or additional materials to give them weather resistance. By removing all of the old, cracking paint you might find that your wood windows are actually quite beautiful, graceful, and strong.
4. You actually love the character of antique glass.
Even the glass in antique windows tells a story. It may be roundel or cylinder glass, each indicating a certain era of manufacturing. Old glass has varieties of color and texture that are a delight to the eye. Two layers of glass are better than one, and in an antique home that second layer of glass should be the storm window that protects the original window.
5. You think a warranty should be more than 20 years.
Chances are your windows have done their job for fifty or more years already. Sure, they may be a little creaky and may not be as attractive as they once were, but it’s a far better investment to repair a proven performer than to sink money into a new window that only has a 20-year warranty at best. With proper maintenance your antique windows will last for generations to come. Heck, even without maintenance they may last that long!
6. Avoiding vinyl.
Poly vinyl chloride (PVC) is becoming one of the greatest concerns in the building industry. Not only does the production of it create an environmental nightmare, but the gases it emits over time are becoming a concern. In the event of a house fire, burning PVC releases toxic amounts of dioxin. Also, manufacturers use Lead as a stabilizer in the production of PVC. If you are concerned about our planet’s health, and your own carbon footprint, you should read up on efforts to reduce the use of vinyl.
7. Better lighting: you just want more of it.
When you set a replacement window into the window opening, the sash is smaller than the originals, therefore you get less viewing area and less light. Who wants less light?
8. Windows are a functional part of your house.
The best balance system ever invented is the weights and pulleys system. There is a prevalent myth that a lot of cold air comes in through the weight pocket. However, if there is cold air in the weight pocket it’s generally because there is a gap between the outside trim of the house and the siding. It may also indicate a poor seal at the floor joists. Replacing easily serviceable weights and pulleys with vinyl jamb liners or invisible balance systems means installing a system that has a maximum life span of 10-20 years but generally fails in less time. It is so much easier open and close windows with one hand when everything is restored to the way it was designed to work!
9. The reduction of heating costs is about 30-40%.
According to the Field Study of Energy Impacts of Window Rehab Choices conducted by the Vermont Energy Investment Corporation, the University of Vermont School of Civil and Environmental Engineering, and the U.S. Army Cold Regions Research and Engineering laboratory, the estimated first year energy savings between a restored wooden window with a good storm window vs. a replacement window was $0.60. Yup, less than a buck. In their conclusions section they noted, “The decision to renovate or replace a window should NOT be based solely on energy considerations, as the difference in estimated first year savings between the upgrade options are small.” Broken glass, failed glazing, no weather stripping – these small and repairable items are what really effect energy efficiency in windows.
10. And finally, because the structure already built is the greenest.
People tout replacement windows as a way to save energy. When you evaluate the entire production, shipping, installation, and removal process; replacing them consumes so much more energy. To put this another way, an older building has a great deal of embodied energy. When we consider the total energy to manufacture replacement windows, then the breakeven point stretches 40-60 years. Sadly, replacement windows often fail long before that whereas historic windows can last for generations. In the words of Richard Moe, President of the National Trust for Historic Preservation, “We can’t build our way out of the global warming crisis. We have to conserve our way out. That means we have to make better, wiser use of what we have already built.” Restoration work can create up to 10 lbs. of waste compared to replacing which is around 50 lbs. of waste. Local craftspeople can do the work and use a minimum of materials/resources while maximizing labor. Restoring windows is the best use of your embodied energy and the best way to support the local economy.
Information is from Window Preservation Alliance.