If you’re reading this post, you probably have windows that are drafty or that feel cold (or both!), or they don’t block enough noise from outside. Replacing those windows isn’t the slam dunk that it would seem… the most obvious problem with replacement windows is the high, up-front cost. The second issue is the replacement windows’ comparatively short lifespan–independent, third-party testing by reputable organizations proves that the energy savings from replacement windows will not pay back the cost of those windows before the end of their useful life (despite the outlandish claims of many window replacement companies). And finally, in order to keep costs down, many replacement window companies don’t even remove the old window frames–they simply remove the sashes and then install new windows inside the old frames. Yes, this means your new windows are smaller which lets in less natural light and impacts the way your house looks on the outside.
So, what can you do?
There are a variety of upgrades that you can make to your existing windows… all will improve your windows’ comfort level and energy efficiency to a greater or lesser degree, and some will also improve their acoustic performance. The range in cost is a reflection of the fact that, as with most things in life, you get what you pay for. However, every one of these options is, in most cases, a better overall solution than replacing your windows. The one exception is if your existing windows are so badly rotted that they’re not salvagable. Otherwise, read on:
1. Window Films
Window films are typically tinted films that are applied to your window glass. They are most helpful in hot climates where reducing solar heat gain is important to keep air conditioning costs in check. Unfortunately they’re not helpful in cold climates.
Cost: Installing window films typically costs between $5 to $15 per square foot.
Cost vs. Value: This can be a helpful option in hot climates, but the tint also reduces the natural light that comes inside and can keep the sun’s heat from helping a house stay warm in cold climates. Also, keep in mind that films do not increase the R-value of windows, and they do not help mitigate drafts and air leakage.
2. Caulking and Weatherstripping
As you would expect, caulking and weatherstripping is focused on sealing gaps and cracks to reduce air leakage. Some windows are in desperate need of better sealing, so
Cost: Materials for caulking and weatherstripping range from $5 to $20 for enough to cover multiple windows.
Cost vs. Value: This is an inexpensive and straightforward DIY project that yields immediate benefits in comfort and energy savings IF the windows in question have aged and deteriorated seals. While air-sealing is a great first step, this option does not increase the insulative value of windows.
3. Heat-Shrink Film Kits
Widely available at very low cost, these kits include a sheet of clear plastic and double-sided tape. You tape the plastic sheet to the trim around a window and then, using a hair dryer, carefully heat the plastic sheet so that it becomes taut. It may reduce drafts (if you install it well) and add an air gap between the sheet and the glass for some insulation value. However, there are significant downsides. First, you have to spend significant time installing film on each window every year. Second, you’re essentially adding a layer of Saran wrap to your windows–do you want to look at and look through Saran wrap all winter long? Third, these kits are installed with tape that can damage the surface of your windows and may not come off easily six months later. Fourth, these kits are not reusable, which means you’re buying these kits every year and then sending them to the landfill. Are they better than nothing? Sure, but they have serious drawbacks.
Cost: Prices range from $5 to $15 per window per year depending on size and the kit
Cost vs. Value: These films provide improved thermal performance at a very low price, but with lots of drawbacks.
4. Cellular Shades
Performance Improvement: Cellular shades, or honeycomb shades, trap air within their cells, providing an insulating barrier between the window and the room. They can noticeably improve thermal performance when fully closed, but of course this means you can’t see out of the window. While cellular shades can help with insulation, but they do not address draftiness or air leakage.
Cost: Depending on size and quality, they cost between $50 to $350 per window.
Cost vs. Value: Cellular shades offer a reasonable mix of energy savings, aesthetic appeal, and light control, but only when they’re fully extended, and even then they do not help with air sealing.
5. Window Inserts
Performance Improvement: These are clear inserts that fit snugly inside the window frame, creating an insulating layer. They reduce drafts and improve the overall energy efficiency of windows.
Cost: Window inserts generally cost between $20 and $40 per square foot.
Cost vs. Value: While the upfront cost might be higher, these inserts are economical in the long term due to their durability and their thermal efficiency and air-sealing. Combined with their sleek, high-end appearance, the performance of window inserts sets them apart from lesser alternatives.
Conclusion
Improving the thermal performance of existing windows doesn’t always require a full replacement. From cost-effective measures like caulking and weatherstripping to more substantial investments like secondary glazing and Low-E coatings, there’s a range of options to suit various budgets and needs. Each method offers its unique balance of cost and value, helping homeowners enhance comfort, reduce energy consumption, and save on utility bills.
Regardless of which option you choose, doing something is better than doing nothing. You’ll end up saving money, reducing energy usage, and being more comfortable in your home!