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Summer in southeastern Pennsylvania is no joke. By the time July rolls around, the sun can beat down on your patio, flood your sunroom with blinding glare, and drive indoor temperatures up even with the air conditioning running full blast. Interior blinds and shades help, but they only fight the battle after the heat has already entered your home.
Exterior window shades change the game entirely stopping heat and glare at the source, before it ever crosses the glass.
At Bartlett Blinds and Shutters, we help homeowners throughout Collegeville, Reading, and the surrounding areas transform uncomfortable outdoor spaces and overheated rooms into cool, comfortable retreats all with the right exterior shade solution. Here’s everything you need to know.
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What Are Exterior Window Shades?
Exterior window shades sometimes called outdoor shades or exterior sun shades are window treatments mounted on the outside of your home, rather than inside. They’re designed to intercept solar energy before it passes through your glass, which is fundamentally more effective than any interior shade or blind.
Think of it this way: when sunlight hits interior shades, the heat has already entered the room. Exterior shades deflect that energy outward, keeping your living spaces cooler and reducing the load on your HVAC system. They’re commonly used on:
- Patios and pergolas
- Decks and outdoor living areas
- Large picture windows and sliding glass doors
- Sunrooms and screened porches
- Commercial storefronts and restaurants
Whether you’re looking to make your patio usable on a hot afternoon or protect your hardwood floors from UV fading, an exterior shade delivers results that interior treatments simply can’t match.
The Real Benefits of Exterior Sun Shades
1. Superior Heat Rejection
Interior shades can reduce heat gain somewhat, but exterior shades stop up to 80% or more of solar heat before it enters through the glass. That’s the most efficient form of passive cooling available for windows. Less heat entering your home means lower cooling bills and a more comfortable living environment even on the hottest Pennsylvania summer days.
2. Glare Reduction Without Sacrificing Views
One of the biggest frustrations for homeowners is having to choose between natural light and a usable space. Sun control window treatments like exterior roller shades let you dial down the glare dramatically while still maintaining your view of the yard, garden, or street outside. You get the brightness of natural light without the squinting.
3. UV Protection for Your Home and Belongings
Ultraviolet rays are responsible for fading hardwood floors, discoloring upholstery, and deteriorating window frames. Exterior shades block the majority of UV radiation at the source, protecting your furniture, flooring, and interior finishes from premature wear.
4. Expanded Outdoor Living
One of the most underrated benefits of outdoor shades is what they do for your patio or deck. By blocking the afternoon sun, they convert spaces that would otherwise be unbearable during peak heat into comfortable areas for relaxing, dining, and entertaining. Add a motorized option and you can raise or lower them with a button press as conditions change throughout the day.
5. Privacy Without Closing Off Your Space
Exterior shades provide a degree of privacy particularly from street-level sightlines while still allowing light in from above. During the evening, many open-weave exterior shades can be lowered to shield interior views without making your home feel closed off.
Types of Exterior Shades to Consider
Not all exterior shades are created equal. Here’s a breakdown of the most popular options and where they work best:
Exterior Roller Shades
The most versatile and widely used option, exterior roller shades roll up neatly when not needed and drop down to provide shade, privacy, or weather protection as needed. They’re available in a range of opacity levels from open-weave fabrics (which maintain views) to block out options (for maximum heat and light blocking).
Best for: Patios, decks, large windows, sliding glass doors
Solar Screen Shades
Solar screen fabrics are engineered specifically for sun control. They’re woven tightly enough to reduce glare and UV penetration while still maintaining outward visibility. The “openness factor” of the fabric (typically ranging from 1% to 14%) determines how much light and view passes through. A lower openness factor means more shade and privacy; a higher openness factor means more transparency.
Best for: Sunrooms, covered porches, large glazed windows
Motorized Exterior Shades
For large shades or hard-to-reach locations, motorized operation is a game-changer. Motorized exterior shades can be integrated with smart home systems, programmed on schedules, or linked to sun sensors that automatically lower the shades when solar intensity reaches a set threshold. Many of our clients combine motorized shades with wind sensors that retract shades automatically during high winds, an important feature for Pennsylvania’s stormy spring weather.
Best for: Large patio shade systems, high windows, full smart-home integration
Interior vs. Exterior Shades: Which Is Right for You?
This is one of the most common questions we hear at Bartlett Blinds. The honest answer is that both have a role to play, and the right choice depends on your specific goal.
| Goal | Interior Shade | Exterior Shade |
| Reduce heat gain | Moderate | Excellent |
| Block glare | Good | Excellent |
| UV protection | Moderate | Excellent |
| Privacy | Good | Good |
| Outdoor living coverage | Not applicable | Excellent |
| Aesthetics (indoors) | Wide range | Minimal interior impact |
| Year-round use | Yes | Seasonal (or year-round in covered areas) |
For homeowners dealing with west-facing windows that bake in the afternoon sun, or a patio that becomes unusable from May through September, exterior sun shades are almost always the superior solution. For spaces where you primarily want light control and interior decor impact, interior shades remain the better fit.
Many Bartlett Blinds customers end up layering both: exterior shades for thermal performance and patio coverage, paired with interior roller shades or sheers for decorative flexibility and nighttime privacy.
What to Look for When Choosing Exterior Window Shades
Shopping for exterior shades involves a few key considerations beyond just color:
Fabric openness factor. As mentioned above, this determines how much light and view passes through. We recommend considering the orientation of your windows. West-facing exposures often benefit from a tighter weave (1–3% openness) for maximum heat blocking; north-facing areas may do well with a more open fabric (5–10%).
Material durability. Exterior shades face wind, rain, UV exposure, and temperature swings. Look for fabrics rated for outdoor use fiberglass-reinforced vinyl or solution-dyed acrylic are popular choices because they resist mold, mildew, and fading without sacrificing appearance.
Mounting options. Exterior shades can be surface-mounted to fascia, brackets, or pergola beams. The right mounting depends on your architecture and whether you want a recessed cassette (which hides the rolled-up shade for a cleaner look) or a standard open roll.
Manual vs. motorized operation. For shades under about 8 feet wide, manual operation with a side cord or spring mechanism is perfectly practical. Larger shades, or those mounted high, almost always benefit from motorization for ease of use and longevity.
Color and fabric. Darker fabrics provide better glare reduction and outward visibility. Lighter fabrics reflect more heat and can feel brighter and more open from the inside. We carry a wide range of colors and can help you find options that complement your home’s exterior palette.
Why Professional Installation Matters
Exterior shades are exposed to the elements in ways interior treatments simply aren’t. A shade that’s improperly mounted will flap in the wind, wear prematurely, and potentially damage your siding or trim. Professional installation ensures:
- Correct mounting hardware for your specific exterior material (wood, stucco, brick, vinyl)
- Proper tensioning and side guides to prevent wind movement
- Clean, level installation that looks intentional from the street
- Correct electrical rough-in for motorized systems
- Manufacturer warranty compliance
At Bartlett Blinds and Shutters, we handle every step from a free in-home consultation to measurement, fabrication, and professional installation. We bring the showroom to you, so you can see fabric samples in your actual space before committing.
Ready to Stay Cool This Summer?
If you’ve been putting up with a sweltering patio, blinding afternoon glare, or a sunroom that’s only usable in winter, exterior window shades might be the single most impactful upgrade you can make this season.
Bartlett Blinds and Shutters serves homeowners throughout Collegeville, Reading, and the greater Philadelphia area. Our team will help you find the right exterior shade solution for your space, your style, and your budget.
Frequently Asked Questions About Exterior Window Shades
Q: How much do exterior window shades reduce heat?
High-quality exterior sun shades can block up to 80–90% of solar heat gain, depending on the fabric’s openness factor and color. This is significantly more effective than interior window treatments, which can only manage heat after it has already passed through the glass.
Q: Can exterior shades be left out in the rain?
Most outdoor shades made from solution-dyed acrylic or coated fiberglass fabrics are water-resistant and can handle light to moderate rain. However, we recommend retracting shades during high winds or severe storms to prolong their lifespan and prevent damage.
Q: Are exterior shades the same as awnings?
No. Awnings are fixed or retractable canopies that project out from the building to shade the area in front of a window or door. Exterior shades hang vertically (like an indoor roller shade) and are mounted flush to the exterior wall or structure. Both provide sun protection, but exterior shades are more versatile for specific window and patio openings.
Q: Do exterior shades work in winter?
Exterior shades are primarily a warm-season product in Pennsylvania. During winter, they’re typically retracted to allow passive solar heat gain and prevent wind damage. That said, in covered outdoor spaces like pergolas or porches, they can also provide privacy and wind protection year-round.
Q: What’s the difference between solar shades and exterior shades?
“Solar shades” usually refers to interior window shades made from solar-filtering fabric. “Exterior shades” are mounted outside the window. Both use similar materials, but exterior shades offer superior thermal performance because they intercept solar heat before it enters through the glass.
Q: Can I motorize existing exterior shades?
In most cases, existing shades cannot be retrofitted with motors motorization is typically designed into the shade at the time of fabrication. If you’re interested in motorized operation, it’s best to specify this when ordering new shades. Bartlett Blinds carries motorized exterior shade systems that can integrate with popular smart home platforms.
Q: How do I clean exterior window shades?
Most outdoor shade fabrics can be wiped down with a soft brush and mild soap solution. Avoid pressure washing, as this can damage the fabric weave. Many fabrics are also mold- and mildew-resistant, which reduces maintenance requirements significantly.
Q: Are custom-sized exterior shades worth it?
Yes, almost always. Off-the-shelf exterior shades rarely fit window openings or patio structures precisely, and gaps around the edges dramatically reduce their effectiveness. Custom-fabricated shades fit your exact dimensions, mount cleanly, and perform far better.
