Storm windows are an affordable way to improve your home’s energy efficiency without replacing your existing windows. They work best when your window frames are in good condition but lack proper insulation. Here’s why storm windows might be the right choice for your remodel:
- Cost-Effective: Installing storm windows costs about one-third of full window replacements, with prices ranging from $90 to $500 per window compared to replacement costs of $300 to $2,100 per window.
- Energy Savings: They can reduce heat loss by 25%–50% and cut air leakage by over 10%. Low-E coatings enhance this by reflecting 35% more radiant heat, saving on heating and cooling bills.
- Preserve Original Windows: Ideal for older homes, storm windows protect the architectural character while improving insulation.
- Durability: With a lifespan of 15–20 years, storm windows are a long-term solution for energy efficiency.
However, if your windows are damaged – such as rotting frames or broken seals – full replacement is necessary for better performance and compliance with building codes. Storm windows are also unsuitable for outward-opening styles like casement or awning windows.
For a budget-friendly, energy-efficient upgrade, storm windows are a practical choice. But if you’re seeking maximum efficiency or have structural issues, full replacements may be the better option.
How to Install a Storm Window | This Old House
Checking the Condition of Your Current Windows
Before spending money on storm windows, take a moment to assess whether your current windows are suitable for them. Storm windows are most effective when paired with windows that are structurally sound but lack proper insulation. If the frames are sturdy and the glass is unbroken, storm windows can deliver noticeable energy savings without the need for a costly full replacement. This evaluation will help you make smart, budget-friendly decisions during your home improvement project. Start by inspecting your windows to see if they meet these criteria.
How to Tell If Your Windows Are in Good Shape
Begin by performing a visual and hands-on inspection of your window frames. Look for secure, undamaged frames and seals. Use a screwdriver to gently probe wooden frames – solid, firm wood means the frames are still strong. Measure the height and width of the window at multiple points to check for warping, and on windy days, feel around the edges for drafts.
If you have double-pane windows, check for condensation or fogging between the panes. This is a clear sign of a broken seal, which storm windows won’t fix.
"Storm windows work best when your existing windows are structurally sound but simply lack insulation." – J.C. Tonnotti Window Company [3]
Windows that operate smoothly and have intact frames are excellent candidates for storm windows. Adding storm windows to single-pane units can reduce heat loss by 25% to 50% [3], making them a smart upgrade for inefficient but functional windows. However, if you notice any major structural or mechanical issues during your inspection, it may be time to consider a full replacement instead.
When Your Windows Need Full Replacement
If your inspection uncovers serious problems, storm windows won’t be a viable solution. For instance, rotting or soft frames cannot support storm windows. If you notice crumbling wood, severe warping, or large cracks in the frame, replacing the entire window is the better option.
Persistent water leaks or major air drafts that remain even after weatherstripping repairs are also red flags. Similarly, if your windows are difficult to open or close due to frame shifting, storm windows won’t solve the underlying issue. Keep in mind that storm windows aren’t suitable for casement or awning windows that swing outward; these styles typically require a full replacement to improve efficiency. Lastly, if your windows no longer meet local building codes – such as egress requirements for basement windows – replacement isn’t just a good idea; it’s mandatory.
When Storm Windows Work Best
Once you’ve confirmed your windows are in good shape, it’s time to consider where storm windows can make the biggest impact. They’re a practical choice in specific situations, offering improved performance without the hassle or cost of full replacements. Knowing when to use them can help you strike the perfect balance between staying on budget and meeting your home’s needs.
A Budget-Friendly Boost to Energy Efficiency
Storm windows are a cost-effective way to improve energy efficiency, often costing just a third of what full window replacements would. They work by creating an extra layer of insulation, reducing air leakage by 10% or more [1]. Add low-e coatings, and they can reflect radiant heat 35% better than standard glass [1], keeping your home warmer in the winter and cooler in the summer. In fact, many storm windows rated by the Attachment Energy Rating Council (AERC) deliver energy savings similar to the best energy-efficient replacement windows – but for a fraction of the price [1].
"Installing interior or exterior energy-efficient storm windows that are rated by the Attachment Energy Rating Council (AERC) can produce similar savings but at about 1/3 of the cost." – Department of Energy [1]
Preserving the Character of Older Homes
For historic or traditional homes, storm windows are a game-changer. They allow you to enhance energy efficiency without altering the original windows or frames, maintaining the home’s classic charm. Interior storm windows are nearly invisible from the outside [2], so your home’s exterior aesthetics stay intact while you enjoy modern insulation.
With finishes like Mill (unpainted aluminum), White, Tan, and Bronze, storm windows can blend seamlessly with your home’s original color palette [2]. Custom options are also available to fit the unique shapes and sizes often found in older homes. Plus, low-e coatings add an extra layer of protection, blocking UV rays that can fade interior fabrics and flooring [2].
A Smart Temporary Solution for Staged Renovations
If you’re tackling home upgrades in phases, storm windows offer a flexible solution. Interior storm windows are easy to install and remove [2], making them perfect for temporary improvements while you plan or save for larger projects. This way, you can boost energy efficiency now without diving into a major renovation.
Storm windows also deliver financial perks, with an estimated 80% return on investment [6]. Some insurance companies even offer discounts for homes equipped with storm windows, thanks to the added protection they provide against wind and debris [6]. That means you can save on energy and insurance costs as you work through your renovation plans.
Keep reading to see how storm windows stack up against full replacements in terms of cost and performance.
Storm Windows vs. Full Replacement
Storm Windows vs Full Replacement Windows Cost and Performance Comparison
Deciding between storm windows and full replacements depends on factors like budget, energy efficiency goals, and future plans for your home. Each option has its pros and cons, which can guide smarter remodeling choices.
Cost and Installation Differences
Storm windows are the more budget-friendly option, costing between $90 and $500 per window, whereas full replacement windows typically range from $300 to $1,000 or more each [3]. For an average three-bedroom bungalow, replacing all windows can cost anywhere from $12,835 to $17,365 [4].
Installation is another key difference. Storm windows are mounted over existing frames and are often suitable for DIY installation, saving you about $50–$100 per window [3]. On the other hand, full replacements involve removing the entire window unit and frame, which usually requires professional expertise.
Energy Efficiency Comparison
When it comes to energy savings, storm windows can reduce heat loss by 25%–50% and cut air leakage by over 10% [1][3]. Low-E storm windows go a step further by reflecting 35% more radiant heat, potentially saving around $350 annually [5][1].
Full replacement windows, especially those with Low-E coatings and argon gas fills, deliver superior energy efficiency. ENERGY STAR-certified replacements can lower household energy bills by an average of 12% [7]. While storm windows can improve the performance of older windows, they can’t match the overall benefits of a fully modernized system.
Longevity, Maintenance, and Resale Value
Storm windows generally last 15 to 20 years, while modern replacement windows can last 20 to 30 years or more [3]. Maintenance is another consideration – storm windows require seasonal cleaning and, in some cases, removal. Exterior models with weep holes also need regular attention to prevent blockages. Replacement windows, by contrast, need only routine cleaning and occasional hardware checks.
From a resale perspective, vinyl replacement windows typically recover 67%–73% of their cost upon sale [4]. Storm windows, on the other hand, can offer an 80% return on investment (ROI) – and in hurricane-prone areas, this figure can climb to 86% [8]. Full replacement windows provide not only energy savings but also a significant boost in curb appeal, which is a major selling point if you’re planning to list your home. For those staying put, storm windows offer a quicker, less expensive way to improve comfort.
Here’s a quick comparison of the two options:
| Feature | Storm Windows | Full Replacement Windows |
|---|---|---|
| Upfront Cost | $90–$500 per window | $300–$1,000+ per window |
| Installation | Simple; often DIY-friendly | More complex; professional installation needed |
| Energy Savings | 10%–30% reduction in heat loss [1][3] | Superior efficiency (depends on glass/gas type) |
| Lifespan | 15–20 years [3] | 20–30+ years [3] |
| Resale Value | Moderate ROI (around 80% in some areas) [8] | Improved curb appeal; 67%–73% recoup [4] |
| Maintenance | Seasonal cleaning and occasional removal | Minimal routine care |
Each option has its strengths, so the best choice depends on your priorities – whether it’s immediate cost savings, long-term energy efficiency, or boosting your home’s resale value.
Installing and Maintaining Storm Windows
Adding storm windows to your home is a smart way to boost energy efficiency while keeping costs manageable. The key to success lies in precise measurements, thoughtful selection, and regular upkeep to ensure they perform well over time.
Measuring and Choosing Storm Windows
Accurate measurements make all the difference when it comes to storm windows fitting snugly and working effectively. Measure the height and width of the window opening at three points (top, middle, and bottom) from inside molding to inside molding, and use the smallest measurement. This method accounts for any irregularities, especially in older window frames. Minor gaps can be sealed using caulking or weatherstripping for a better fit.
Storm windows generally come in sizes ranging from 3 to 6.5 feet high and 1.5 to 3.5 feet wide [6]. When it comes to materials, here’s a quick cost breakdown:
- Aluminum frames: $100 to $275 per window
- Vinyl frames: $125 to $300 per window
- Wood frames: $175 to $400 per window
Adding a low-e coating can increase the price by $125 to $400 per window, but it’s worth noting that this upgrade can reduce air leakage in your home by 10% or more [1]. For the best energy savings, look for models rated by the Attachment Energy Rating Council (AERC) or those with the ENERGY STAR window ratings [1]. If you’re opting for exterior storm windows, ensure they include weep holes at the bottom to let condensation escape – don’t seal these off during installation.
Regular Maintenance Tasks
Once your storm windows are installed, regular upkeep is crucial to keep them in top shape. Here are some simple maintenance tips:
- Cleaning: Wash the glass and frames seasonally with soapy water and a squeegee.
- Tracks: Use a vacuum with a narrow extension to clear debris from the tracks annually.
- Stubborn grime: For tough spots, a non-abrasive scouring pad and soapy water work well.
To keep moving parts smooth, lubricate spring catches and sliding mechanisms yearly with a moisture-displacing lubricant. Aluminum frames may develop a white, powdery oxidation over time – this can be removed gently with fine steel wool. For wood frames, repaint every 2 to 5 years to prevent damage, but avoid applying thick layers of paint that could interfere with the window’s fit. Before reinstalling seasonal storm windows, check the weatherstripping for brittleness and ensure all caulking and sealants are still intact. When removing windows for storage, label each one with notes indicating its room and position for easy reinstallation later.
When to Replace Your Storm Windows
Even with proper care, storm windows will eventually wear out. Look for these signs to know when it’s time to replace them:
- Warped or damaged frames that no longer seal properly
- Broken or cracked glass panes
- Condensation forming between the storm window and the primary window, signaling seal failure
If the weatherstripping becomes brittle or you notice drafts despite maintenance, it’s likely time for an upgrade. On average, storm windows last about 15 to 20 years, though aluminum frames can last up to 45 years with the right care [3][6]. Replacing old units not only restores their energy-saving benefits but also helps protect your primary windows from moisture damage.
Conclusion: Choosing the Right Option for Your Remodel
Enhance your living space with windows designed for performance and style.
When deciding between storm windows and full replacements for your remodel, it all comes down to your budget, the condition of your existing windows, and your long-term goals. If your frames are in good shape and you’re working on a phased renovation plan, storm windows might be the smarter choice.
Storm windows provide immediate benefits. They cost about one-third of what full replacements do and can reduce heating and cooling costs by 10–30% [1]. With an 80% return on investment and a lifespan of 20–30 years, they’re a practical solution for many homeowners. Modern low-e storm windows go a step further, reflecting radiant heat 35% better than clear glass [1] and cutting overall air leakage by at least 10% [1]. Plus, they’re an excellent option for preserving the character of historic homes.
However, if your window frames are damaged – rotting, warped, or beyond repair – full replacement becomes necessary. Replacements, which last 30–40 years, are also worth considering if you’re focused on long-term durability or plan to stay in your home for decades.
For homes with single-pane windows, especially in regions with extreme weather, storm windows often deliver some of the best returns on home improvement investments. To get the most out of them, look for models with an AERC rating or ENERGY STAR certification and low-e coatings for enhanced energy efficiency.
Ultimately, the right choice depends on your home’s needs, your renovation plan, and how long you intend to live in the property.