Sun-blocking windows are an effective way to keep homes comfortable, especially during hot summer months. These specialized windows are designed to reduce solar heat gain, potentially lowering energy costs and protecting interior furnishings from sun damage. For homeowners dealing with rooms that heat up quickly due to sunlight streaming through windows, investing in sun-blocking windows can be a game-changer. This guide will explore the various types of sun-blocking windows, their pros and cons, costs, and alternatives to help you make informed decisions about managing sunlight and heat in your home.
*Costs in this article sourced from contractor estimates used by Angi.
Types of Sun-Blocking Windows
There are several types of sun-blocking windows on the market, each with unique features and advantages. Understanding these options can help you select the best solution for your specific needs.
Tinted Windows and Window Films
Tinted windows contain added minerals and pigments that reduce light transmission. These windows come in various shades, from light to dark. Darker tints block more sunlight but also reduce visibility. Window films offer a similar effect and can be applied to existing windows as a more affordable alternative to full window replacement.
Tinted windows use a combination of dyes that block and absorb sunlight. This can significantly cool down rooms that receive a lot of sun exposure. Window films come in different grades and types, such as UV films that specifically block ultraviolet light. Moreover, decorative tints and frosted films can provide added privacy or aesthetic appeal.
Reflective Low-E Windows
Windows with reflective metallic or ceramic coatings are highly effective at blocking solar radiation. Low-emissivity (low-E) windows come with standard reflective coatings that provide ultraviolet (UV) protection and block infrared light. Per the International Association of Certified Home Inspectors (InterNACHI), these windows can reduce energy loss by 30% to 50%.
Low-E windows work by minimizing the amount of ultraviolet and infrared light that penetrates through the glass without reducing transmitted visible light. The reflective coatings are usually microscopically thin layers of metal or metallic oxide – typically silver. Manufacturers may apply multiple layers to increase effectiveness.
Electrochromic Windows
Also known as “smart glass,” electrochromic windows can electronically tint to block sunlight on demand. This advanced technology allows homeowners to adjust the tint level for customizable light, glare, and heat control, offering a high degree of flexibility throughout the day.
The technology behind electrochromic windows involves electrically charged particles in the glass that change the tint level when voltage is applied. This type of window can improve energy efficiency and comfort by dynamically responding to external light conditions. Some advanced systems can even be automated and controlled via smart home systems or smartphone apps.
Solar Screens
While not technically windows, solar screens are exterior roller shades made of solar fabric that can be installed over existing windows. These screens can significantly block solar heat while preserving views, making them a cost-effective option for those not ready to replace their windows.
Solar screens have the added benefit of reducing glare and improving daytime privacy. They are usually made from polyester or fiberglass mesh coated with PVC, providing durability and weather resistance. Installation can be straightforward, either mounted on the outside of windows or installed as retractable screens.
Pros and Cons of Sun-Blocking Windows
Before investing in sun-blocking windows, you should weigh the advantages and disadvantages. Here are some key points to consider:
Pros
- Significantly reduce solar heat gain and keep interiors cooler
- Lower air conditioning costs in hot climates
- Block UV rays, protecting interior furnishings from sun damage
- Provide privacy without sacrificing natural light
- Improve overall energy efficiency and lower carbon footprints
- May qualify for energy rebates
- Enhance comfort and visual appeal of homes, adding potential value to real estate
Cons
- Dark tints and reflective coatings may reduce visibility
- Some options may not qualify for LEED project certification points
- Can give the home an unwelcoming appearance from the exterior
- Often cost substantially more than conventional windows
- May require professional installation
- Potential maintenance concerns for certain types, like electrochromic windows that may require periodic recalibration
How Much Does Installing Sun Blocking Replacement Windows Cost?
The cost of installing sun-blocking replacement windows can vary widely depending on several factors. On average, homeowners can expect to pay $1,525 per window for solar control replacement windows. Factors that can affect the total cost include the type of window, window frame material, window size, and accessibility for installation.
Here are some price ranges for typical energy-efficient window options:
- Window film: $6.00 to $14.00 per square foot
- Tinted double-pane windows: $50.00 – $1,650.00 per window
- Low-E coated windows: $300.00 – $1,000.00 per window
- Electrochromic smart glass: $150.00 to $3,000 per window
- Solar window screens: $60.00 to $850.00 per window
It’s important to note that these costs don’t include professional installation services, which typically range from $100.00 to $300.00 per window. Additionally, other factors like local climate, window shape, customization options, and potential for increasing home value should also be considered in long-term financial calculations.
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DIY or Hire a Pro When Installing Sun Blocking Windows?
Installing sun-blocking windows is a challenging project that requires intermediate carpentry skills and specialized tools. While some homeowners may be tempted to tackle this as a DIY project, there are several reasons why hiring a professional might be the better choice.
Key steps in window replacement include:
- Removing and disposing of the existing window sash and frame
- Preparing and sealing the rough opening
- Installing the replacement window according to manufacturer instructions
- Insulating gaps, sealing, and trimming for a finished look
Although DIY installation can save on labor costs, improper installation can lead to poor performance, void warranties, and even cause damage to your home. Professionals bring expertise, proper tools, and experience in dealing with potential issues like structural problems or unexpected challenges.
Hiring a professional ensures that windows are installed properly and often comes with the added benefit of a labor warranty. This can provide homeowners with peace of mind and protection against potential issues down the line. It’s recommended to get free estimates from reputable local contractors before making a final decision.
Aside from practical installation, professionals can also offer guidance on the best types of windows suited for specific environments, local code requirements, and potential rebates or incentives for energy-efficient models.
This site receives compensation from the companies featured in this listing, which may impact where and how products appear. This listing doesn’t feature all companies, products, or offers that may be available.
Are There Alternatives to Sun-Blocking Windows?
For homeowners who find the cost of sun-blocking windows prohibitive or prefer not to change their existing windows, there are several alternatives worth considering:
Insulated Cellular Shades
These shades are one of the best window coverings for keeping heat and sunlight out of a home. According to ENERGY STAR, insulated cellular shades can reduce heat loss by 40% or more.
Cellular shades, also called honeycomb shades, consist of air pockets that trap heat for excellent insulation. They also come in various opacities and colors, catering to different room aesthetics.
Roller and Roman Shades
These window coverings roll or fold up when raised or lowered. While they offer slight insulation benefits, heavier fabrics provide better thermal performance.
Roman shades, when made from thermal or blackout fabrics, can significantly reduce heat penetration. The versatility of design makes them an appealing choice for various room styles.
Blinds
Highly reflective blinds can help reduce heat gain and glare while still allowing daylight to illuminate a room.
Options include vertical or horizontal blinds made from different materials like aluminum, PVC, or wood. They are easy to operate and maintain, with the added benefit of adjustable light control.
Curtains
Medium-colored drapes and curtains with white plastic backings can lower heat gains by as much as 33% during the summer, as reported by ENERGY STAR.
Lined curtains or thermal-backed drapes provide additional insulation. They come in numerous styles, patterns, and fabrics, making them a versatile choice for interior design while also improving energy efficiency.
Exterior Roller Shutters
These provide protection from the sun and weather while adding privacy and security to a home.
Exterior roller shutters are typically made from aluminum or steel, providing a robust solution to thermal insulation and security. They can also reduce noise and offer complete light blockage.
Awnings
Awnings may reduce solar heat gain in the summer by up to 77%. They provide shade to outdoor spaces while also reducing heat and glare inside. However, if they’re not retractable, they can increase the energy used for heating the home during colder months.
Available in various materials like canvas, acrylic, or metal, awnings enhance outdoor living areas while protecting indoor spaces from direct sunlight. Some modern awnings come with sensors and motors for automatic retraction based on weather changes.
Are Sun Blocking Windows Worth It?
For many homeowners, especially those in hot climates or with west- or south-facing windows that absorb significant heat, sun-blocking windows can be a worthwhile investment. These high-performance windows can improve comfort and reduce cooling costs and electricity bills.
When shopping for new windows, it’s important to prioritize solar control and heat blocking over visible light transmittance. However, if current windows are in good condition, homeowners might want to consider lower-cost exterior solar screens before committing to a full window replacement.
Final Thoughts About Sun-Blocking Windows
Sun-blocking windows offer a powerful solution for homeowners looking to manage heat gain and reduce energy costs. While the initial investment in sun-blocking windows can be significant, the long-term benefits in comfort and energy savings make them a smart choice for many households.
Whether opting for advanced low-E coatings, electrochromic smart glass, or more affordable alternatives like solar screens, you can find options to suit a variety of budgets and needs. By carefully considering the pros and cons, costs, and alternatives, you can make informed decisions about the best sun-blocking solutions for your home. Ultimately, the right choice will depend on your individual circumstances, climate, and long-term energy goals.
FAQs About Sun Blocking Windows
Yes, on average, expect to pay 20% to 50% more compared to conventional double-pane windows. Advanced low-E coatings, electrochromic smart glass, and specialty tints will add to this cost. However, exterior solar screens and window films are affordable options to add to your existing windows.
Darkly tinted windows create this effect, and some homeowners dislike the aesthetic. However, advanced solar control low-E coatings effectively block heat while preserving natural light transmittance and visibility. These products offer the benefits of sun blocking windows without an overly dark or mirrored look.
Sun blocking windows last 10 years to a lifetime on average. Advanced glazing helps protect against UV damage. Make sure windows have durable low-E coatings and glass for maximum longevity. Fiberglass or vinyl frames also outlast less durable materials.
If the new windows meet ENERGY STAR certification standards for your climate zone, they can qualify for a federal tax credit of up to 30% of installation costs (up to $600 total). However, you must install the windows in a principal residence and include proper sealing for maximum efficiency.
Windows that face east, west, or south tend to gain the most solar heat and are smart targets for replacement. North-facing windows are unlikely to overheat significantly and may only need simple blinds or curtains. I recommend conducting an energy audit to help identify problem areas that can help you properly focus your window replacement project.
The financial savings that come from sun blocking windows can depend on many factors, including climate, sun exposure, local energy costs, the type of window used, home insulation, and more. According to Energy Star, homeowners can see energy costs reduced by 15% to 35%.
