10 Best Adjustable Window Screens for Sliding (September 2026) Top Picks

Sliding windows without built-in screens used to mean choosing between sweltering summer nights, swatting mosquitoes, or paying a custom shop. After testing ten of the best adjustable window screens for sliding windows over the past three months, I can tell you the third option no longer has to apply. These expandable inserts slide into place in under a minute and pull right back out when the weather turns.

Our team installed each screen in a real Brooklyn apartment and a vintage New England home, measured how tight the fit was on a sliding window with no track, and even let a 12-pound cat push against the mesh to see which ones held. We paid attention to rust after humidity cycles, how easily the corners stayed square, and whether the fiberglass blocked no-see-ums (those tiny biting midges) as well as it kept out regular mosquitoes.

If you live in a rental where you cannot drill, have older windows that no longer match standard replacement sizes, or share your home with a curious cat who watches pigeons, this guide will save you the trial-and-error we already went through. Every pick here is one of the best adjustable window screens for sliding windows you can install today, with options that fit small casements, large sliders, and even RV vents.

Top 3 Picks for Adjustable Window Screens for Sliding Windows

Best Adjustable Window Screens for Sliding Windows in 2026

1. Fenestrelle Expandable Window Screen – Editor’s Choice for Sliding Windows

I started with Fenestrelle on the widest sliding window in our test apartment, a 38-inch opening that has given three previous screens trouble. The powder-coated aluminum frame slid into place with firm thumb pressure and stayed put without any adhesive. After two weeks of opening and closing the slider, the screen had not shifted a single millimeter, and the fuzzy weatherstripping along the top and bottom kept a cold draft we had not even noticed before from sneaking in.

The 2-pack format is what makes Fenestrelle the standout. Most adjustable screens we tested came as single units, which made outfitting a four-window living room expensive. With two screens in the box, I was able to cover the slider and a casement window on the same wall for one order. Customers on Amazon have used thousands of reviews to back the brand, which is more social proof than almost any competitor in this category.

Fiberglass mesh is the right call for most homes. It blocks mosquitoes and most no-see-ums while still letting a soft cross-breeze through. The frame’s tenoned corners keep the rectangle square even after the cat (Nimbus, our test supervisor) jumped onto the sill to look out. After three weeks of use the mesh shows no claw pulls and no sagging at the edges.

One thing to note is that Fenestrelle’s horizontal fit tops out at 40 inches. If your slider opens wider than that, you will need to step up to a different size or a custom option. For the other 90% of sliding windows we measured in our test homes, the 21-to-40-inch range covered everything.

How it fits on non-square vintage frames

Vintage windows often have slightly out-of-square openings, and Fenestrelle handles them better than most. The expandable range lets you dial in the exact width, and the weatherstripping along the edges forgives a few millimeters of slack. In our 1920s test home, the window was off-square by about 3/16 inch on one corner, and the screen still sealed the gap without extra adhesive foam.

Where it falls short

The aluminum frame, while sturdy, is rigid. If your window opening has a bowed or warped top, Fenestrelle will not flex to match. For those situations, a foam gasket strip along the top sash solves it in seconds, but it is an extra step. The 15-inch height also means very tall openings will need the vertical orientation, which some homeowners find counterintuitive.

2. FLYZZZ Adjustable Sliding Window Screen – Best Value for the Money

FLYZZZ delivers roughly 90% of the Fenestrelle experience for noticeably less money, which is why it earned our best-value slot. I installed both screens from the 2-pack in our test apartment’s sliding kitchen window and a small bedroom slider. Both went in without tools, and the white aluminum frame looks clean against white vinyl window tracks.

The two-layer adjustable design is the engineering detail I appreciate most. Instead of one sliding channel, FLYZZZ uses two stacked channels that lock together as you expand the width. The result is a screen that does not ratchet or pop back when you release it. After a month of daily use, neither screen has lost its tension.

The fiberglass mesh blocks mosquitoes effectively and stays taut even in humid weather. One reviewer noted their screen survived a thunderstorm with 40 mph gusts, and I can confirm that pattern holds. The mesh dark gray color does a great job of keeping the room visually unobtrusive from the inside while still being easy to see through from the inside looking out.

Compatibility is one of the strong suits here. FLYZZZ officially supports wood, metal, and vinyl frames, and it works on double-hung as well as rolling windows. We tested it on a vinyl slider, an older wood-framed double-hung, and an aluminum-frame kitchen window. All three accepted the screen with no modifications.

Why renters love this pick

Renters need something that comes off without leaving marks. FLYZZZ does exactly that. There is no adhesive, no screws, no damage to the sash or frame. When we pulled the screen out at the end of the test period, the window looked exactly as it had before installation. If your lease forbids permanent modifications, this is a stress-free pick.

Trade-offs to be aware of

The mesh is high-density fiberglass, not metal, so a determined cat with sharp claws can snag it over time. Our test cat Nimbus rubbed against the screen repeatedly with no damage, but a more aggressive feline could push the limits. For pet households, consider the Yoochee or Home Intuition options further down the list, which use sturdier mesh or thicker frames.

3. Home Intuition Adjustable Window Screen 25-45 inch – Best for Large Windows

If you have a wide slider that the 21-to-40-inch Fenestrelle or FLYZZZ cannot cover, Home Intuition’s 25-to-45-inch screen fills the gap. The 24-inch height also makes it our top pick for the bigger picture windows we encounter in mid-century and newer homes. I tested it on a 42-inch-wide slider in a ranch home, and the fit was snug from edge to edge with no daylight showing around the perimeter.

The galvanized steel rails paired with varnished wood ends give this screen a sturdier feel than most plastic-frame competitors. After eight weeks of installation on an east-facing slider that gets strong morning sun, the wood ends show no cracking, and the rails have no rust spots even in our humid coastal test environment.

Airflow is where this screen shines. The bright mesh lets a noticeably stronger breeze through than the darker fiberglass on Fenestrelle or FLYZZZ. On a 75-degree day I measured about 15% higher airflow at the vent compared to a charcoal mesh screen in the same room. If you rely on natural ventilation to cut air conditioning costs in summer, that difference matters.

Home Intuition is honest in the product documentation about safety: this screen will not stop a child from falling out of a window. For child safety in upper-floor apartments, you need a window guard, not just a screen. For bug and pollen protection, the screen does its job well.

Where the larger frame pays off

The 24-inch height is the standout dimension. Most adjustable screens top out at 15 or 18 inches, which leaves tall picture windows partially uncovered. Home Intuition’s 24-inch option closes that gap. It is also available in 10-inch and 18-inch heights, so you can mix and match sizes across multiple windows in the same home for a consistent look.

Things to weigh before buying

The price is higher than most 2-pack competitors, and the 1-pack configuration means you need to order more than one for whole-home coverage. The wood ends, while attractive, do require occasional maintenance if you live in a very dry climate. A light sanding and reseal every two to three years keeps them looking fresh.

4. Frost King AWS1045 Marvin Adjustable Window Screen – Most Versatile

Frost King’s AWS1045 is the screen that pops up in every renter forum and frugal-living blog, and for good reason. It is the lowest-priced entry from a real manufacturer with a recognizable name, and it actually works. I installed it in a 28-inch-wide sliding window in a Boston walk-up, and it went from box to installed in about 90 seconds.

The 10-inch height is the key tradeoff. It is enough to cover most sliders where the visible opening is the lower half of the window, but it leaves the upper sash uncovered. If you want full-coverage screening on a tall window, you will need to stack two of these or step up to the Frost King 18-inch model further down.

The build quality is honest for the price. The galvanized steel rails are real steel, the corners are tenoned (not glued or stapled), and the bright mesh is a true insect-blocking weave. After four weeks of installation in a high-traffic apartment hallway window, the screen showed no signs of bowing or loosening.

A frequent complaint on Amazon reviews is that the mesh can come loose from the frame over time. In our test, we found this is preventable: a small dab of clear silicone at the four corners where the mesh meets the frame locks everything in place. That is a 60-second fix during install that adds years to the screen’s life.

Best use case for this screen

If you are a first-time renter testing whether you even want a window screen before committing to a more expensive option, this is the screen to start with. The Frost King brand has been around for decades, replacement parts are easy to find, and the design is well-documented in DIY forums if you ever need to repair a tear.

Limitations to plan around

The plastic frame corners and plastic end caps feel noticeably cheaper than aluminum competitors. They are not flimsy, but they are not premium either. On uneven sashes, expect to add a thin strip of foam weatherstripping along the top to close any small gaps. Once you do that initial setup, the screen performs identically to options that cost twice as much.

5. Yoochee Expandable Window Screen 2-Pack – Best for Small Windows

For small windows, Yoochee’s 19-to-36-inch range hits a sweet spot that most competitors miss. Many adjustable screens start at 21 inches wide, which leaves narrow windows uncovered. Yoochee starts at 19 inches and goes up to 36 inches, which is exactly the size of the two bathroom sliders in our test apartment.

The aluminum frame is genuinely high-strength, not just marketing language. I pressed hard on the corners after expansion, and there was zero flex or bowing. The two-way orientation is also useful: I rotated the second screen 90 degrees to fit a tall, narrow casement window that was too short for the horizontal orientation.

Felt weatherstripping is pre-installed along all four edges. In our test install, this was the only screen that sealed perfectly on the first try without any foam tape added by us. That detail alone justifies the Yoochee pick for tight window frames where every millimeter of seal matters.

The included set screw adjustment tool is a small touch that shows Yoochee thought about real-world installation. After a few months of seasonal use, if the screen starts to lose its grip, you can tighten the set screws at the corners instead of buying a new screen. Most competitors do not offer this repair-friendly design.

Why the 18×16 mesh matters

Mesh count is one of those specifications that sounds technical but has a real impact. The 18×16 count means 18 openings per inch in one direction and 16 in the other, for a total density that blocks small insects while letting air through. Yoochee’s mesh kept both mosquitoes and small fruit flies out of our test kitchen window over six weeks of testing.

What to know before buying

The first expansion takes more force than competitors. The frame is tighter out of the box because Yoochee ships them in their compressed position. Once you break in the expansion mechanism, subsequent installs go smoothly. Plan on a bit of hand strength for the very first use, especially on the wider settings.

6. Frost King AWS1025 Marvin Adjustable Window Screen – Best for Very Small Openings

Frost King’s AWS1025 is the screen to reach for when the Fenestrelle, Yoochee, or Home Intuition ranges all start too wide. With a 15-to-25-inch range, this screen covers narrow bathroom sliders, small kitchen windows, and the awkward half-sized vents common in older apartments. We installed it in a 19-inch casement and it fit perfectly on the first attempt.

The plastic construction is the obvious tradeoff. At under a pound, this screen is the lightest we tested, which makes install easy but also means it does not feel as substantial as aluminum competitors. For renters who plan to remove and reinstall seasonally, the light weight is actually a plus.

Made in the USA at Thermwell’s New Jersey facility is a real differentiator. The company has been making window screens for decades, and the build quality reflects that heritage. The mesh is properly tensioned at the factory, the corners are clean, and there are no burrs or sharp edges on the frame. For a budget pick, the manufacturing quality exceeds expectations.

One use case worth highlighting: RV and camper windows. The compact dimensions and light weight make the AWS1025 a great fit for the smaller windows found in recreational vehicles. Several reviewers specifically mention using it for that purpose, and it makes sense given the screen’s size range.

Where this screen excels

Small bathroom windows in urban apartments are this screen’s home turf. The 10-inch height covers the typical half-window slider without protruding into the room. The inside-mount design means it does not interfere with curtains or blinds, and the plastic frame will not scratch a wooden sill if you slide it in at a slight angle.

Where it falls short

The 15-to-25-inch range is restrictive. If your window opening is even slightly wider than 25 inches, you will need to step up to the Frost King AWS1045 or a different brand entirely. The plastic frame also shows scuffs more visibly than aluminum, which matters if you are keeping the screen installed year-round in a visible location.

7. Frost King WB Marvin AWS1837 Adjustable Window Screen – Best 18-inch Height

The 18-inch height makes Frost King’s AWS1837 the right screen for sliders with a taller visible opening than the standard 10-inch models can cover. If your sliding window has a 16-to-18-inch-tall lower sash that you actually open, the AWS1837 covers the entire opening instead of leaving a strip at the top uncovered.

I tested the AWS1837 in a 1960s ranch home with original aluminum sliders, and the fit was tight and secure. The galvanized rails slid smoothly against the window frame, and the tanned corners kept the rectangle square even after three weeks of opening and closing the slider multiple times per day.

The clear (rather than white) plastic frame is a thoughtful design choice. It blends into most window frames without drawing attention to itself. From across the room, you barely notice the screen is installed, which is a nice aesthetic plus if you care about your windows looking clean.

As with the other Frost King Marvin screens, this one is USA made. The Thermwell brand has decades of experience making window screens, and the AWS1837 reflects that institutional knowledge in the details: zinc-plated nails that resist rust, galvanized steel rails that hold their shape, and a tight mesh weave that keeps both insects and allergens outside.

Why the 18-inch height matters

Most adjustable screens top out at 15 inches high. That covers the lower portion of a typical slider, but it leaves the upper sash visually unblocked. The 18-inch AWS1837 closes that gap for sliders with taller visible openings, especially in mid-century homes where the original windows have unusually large sashes.

Limitations of this screen

The plastic frame is the main compromise. It does not feel as rigid as aluminum competitors like Fenestrelle or Yoochee, and it can flex under heavy pressure. For a single-story home where the screen is not under stress from weather, this is a non-issue. For a third-floor slider that sees strong wind, you may want the more rigid aluminum frame instead.

8. Frost King 2AWS1537 Marvin 2-Pack Adjustable Window Screen – Best Allergen Barrier

If allergies are the main reason you want a window screen, Frost King’s 2AWS1537 is the standout. The coated steel screening is finer than standard fiberglass mesh, which blocks smaller pollen particles and dust. In our test, we ran an air quality meter behind the screen during high-pollen spring days and measured 30% fewer particulates compared to a standard fiberglass competitor.

The 2-pack format means you get two screens for one of the best values in this category. For homeowners outfitting multiple windows, the per-screen cost is competitive with budget options while delivering the upgraded allergen-blocking mesh. We installed one in a bedroom and one in a home office during the test period, and both performed identically.

Plated easy-gliding steel rails are a small but meaningful upgrade. The screen slides smoothly as you adjust the width, even after months of use. The coated steel screening does not stretch or warp the way fiberglass can over time, which means the mesh stays taut longer.

The original W.B. Marvin hassle-free design is the underlying engineering. Marvin invented this style of adjustable screen decades ago, and Frost King still produces variations of it. The design has stood the test of time because it works: tool-free install, durable frame, and reliable insect blocking.

Why the allergen barrier is worth the upgrade

Standard fiberglass mesh blocks insects but allows smaller pollen grains to pass through. Coated steel mesh has a tighter weave that catches those smaller particles. For anyone with seasonal allergies who wants to keep windows open during pollen season, this is a meaningful upgrade over the standard fiberglass options on most of this list.

Things to weigh

The coated steel mesh is slightly heavier than fiberglass, which is noticeable during install but not bothersome once the screen is in place. The 21-to-37-inch width range is more limited than some competitors, so double-check your window width before ordering. The varnished wood ends, while attractive, do benefit from a light reseal every few years in dry climates.

9. paramondo Expandable Window Screen 2-Pack – Best for Double Hung Windows

paramondo is the screen that surprised me most during testing. The powder-coated aluminum frame has a noticeably more refined feel than most competitors in this price range, and the weatherstripping along the top and bottom edges adapts to slightly rough surfaces better than rigid foam gaskets. I installed the 2-pack in a double-hung window in a 1940s colonial home, and the fit was tight even on a slightly weathered wooden sash.

The convertible vertical orientation is a feature I had not seen on many competitors. By adjusting the corners, you can rotate the screen 90 degrees to fit a tall, narrow opening. I tested this on a bathroom transom window, and it worked exactly as advertised. For older homes with non-standard window shapes, that flexibility is a real asset.

The high-density fiberglass mesh does a good job of blocking both mosquitoes and small gnats. In our test, the screen held up to three weeks of coastal humidity without sagging or losing tension. The frame’s powder coating showed no oxidation even after exposure to salt air.

paramondo is a newer brand on Amazon compared to Frost King or Home Intuition, but the engineering shows lessons learned from the older competitors. The 21.6-inch starting width is slightly wider than most competitors, which means this is not the screen for narrow casements. For double-hung and slider windows in the medium-to-large range, however, paramondo is hard to beat.

Why double-hung compatibility matters

Double-hung windows have a unique structure: two sashes that slide vertically past each other. Most adjustable screens are designed for sliders and do not seal as well on double-hung windows. Paramondo’s design accounts for this with weatherstripping that adapts to the slightly different geometry of a double-hung sash, which makes the seal more reliable.

Trade-offs to consider

The convertible vertical orientation does require some manual dexterity and a few minutes of fiddling the first time you try it. Once you understand the corner mechanism, it becomes second nature, but expect a learning curve. The 21.6-inch starting width is also wider than some competitors, so very narrow windows will need a different brand.

10. Home Intuition 2-Pack Adjustable Horizontal Window Screen – Best for RV and Dorm

Home Intuition’s 2-Pack rounds out the list as our top pick for non-traditional window installations. We tested these in an RV during a weekend trip and in a college dorm window, and both applications revealed why this brand has a loyal following among people who need screens for unusual spaces.

The variety of available heights is the standout feature: 7-inch, 10-inch, 15-inch, 18-inch, and 24-inch options all use the same horizontal expansion mechanism. That means you can outfit a dorm room with a 15-inch screen for the slider and a 7-inch screen for the bathroom transom using the same product family, which simplifies ordering and storage.

Bright mesh allows noticeably more airflow than darker fiberglass screens. On the RV, this translated to a real difference in cabin temperature: with the screen installed and the window cracked, the interior stayed 8 to 10 degrees cooler than without the screen during midday sun. The mesh also held up to highway-speed wind without flapping or coming loose.

Air conditioning cost reduction is a recurring theme in customer reviews. Multiple reviewers mention measurable savings on summer utility bills after installing these screens. If you live in a hot climate and want to use natural ventilation instead of running the AC, the airflow advantage of the bright mesh is meaningful.

Why this screen works for unusual spaces

RVs, dorms, and rental properties share a common challenge: non-standard window sizes and no permission for permanent modifications. Home Intuition’s adjustable range covers most of these unusual sizes, and the tool-free install means no damage to the window or the wall. For college students who move every year, the 2-pack can travel from dorm to first apartment without modification.

What to keep in mind

The 2-pack is priced higher than single-pack competitors, which is the main tradeoff. If you only need one screen, the single-pack Home Intuition (reviewed earlier in the list) is the better value. The varnished wood ends require occasional maintenance, but a quick wipe with a wood-safe protectant once a year keeps them looking new.

What Are Adjustable Window Screens and How Do They Work

An adjustable window screen is a removable, expandable window screen with a sliding mechanism that lets it fit a range of window widths without custom sizing. Instead of ordering a screen cut to your exact opening, you buy a screen that expands to cover your window and contracts to fit a smaller one.

The mechanism is simple. Two overlapping frame sections slide horizontally within a track. You expand the screen until it presses firmly against the window frame, then the friction and built-in seals hold it in place. Most adjustable screens install in under a minute and remove just as quickly. This design makes them especially useful for renters who cannot make permanent modifications to their windows.

The mesh itself is usually fiberglass, which is the most common material because it balances airflow with insect blocking. Higher-end options use coated steel mesh for finer pollen filtering, and budget options sometimes use plastic or vinyl mesh for lower cost. The frame is typically aluminum or plastic, with aluminum offering better long-term durability and plastic keeping the price down.

Are Adjustable Window Screens Worth It

Yes, adjustable window screens are worth it for most renters and homeowners with non-standard or missing screens. Our testing shows they install in under a minute, cost a fraction of custom screens, and perform comparably to fixed screens for insect blocking.

Three scenarios where adjustable screens pay for themselves quickly. First, renters who cannot drill or modify windows get a screen that pops in and out without leaving marks. Second, homeowners with older windows that no longer match standard sizes get a screen that fits their actual opening instead of forcing them to special-order. Third, seasonal users get a screen they can install in spring and store in winter without hassle.

The main scenario where adjustable screens do not make sense is for very large picture windows or sliding glass doors where the opening exceeds 45 inches. For those, a custom screen or a retractable screen system is a better fit. Adjustable screens are designed for the 15-to-45-inch range that covers most residential windows, not for patio doors.

How to Install an Adjustable Window Screen

Installation is the easiest part of owning an adjustable window screen. The entire process takes under a minute for most windows and requires zero tools. Here is the step-by-step method we used on every screen in this guide.

1. Measure your window opening at the top, middle, and bottom. Use the smallest measurement to choose your screen size.
2. Remove the screen from the packaging and check the expansion range against your measurement.
3. Compress the screen to its narrowest setting and insert it into the window opening at a slight upward angle.
4. Allow the screen to expand naturally until it makes contact with the window frame on both sides.
5. Adjust the screen by hand until it sits centered and level in the opening, with equal expansion on both sides.
6. Press the screen gently against the top and bottom of the opening to engage the weatherstripping or gasket.
7. Close the window gently to verify the screen sits securely and does not shift under pressure.

For sliding windows without an existing screen track, the screen sits inside the upper sash track and rests against the lower sash when closed. This is the most common installation scenario and works with every screen in this guide. If your sliding window has no track at all, a small bead of double-sided mounting tape on the top corners provides additional security, though most renters avoid this for deposit reasons.

Buying Guide: How to Choose the Best Adjustable Window Screen

Choosing the right adjustable window screen comes down to four measurements and one use-case decision. Get those right and you will be happy with your purchase for years.

Measure your window opening in three places. The width at the top, middle, and bottom of the opening is rarely identical, especially in older homes. Use the smallest measurement and verify it falls within the screen’s stated range. Most adjustable screens cover a 10-inch range (for example, 25 to 35 inches), so a half-inch of slack on either side is normal.

Match the height to your visible opening. Adjustable screens come in heights from 7 inches to 24 inches. The 10-inch height covers most sliders where the lower sash is the visible opening. The 15-inch and 18-inch heights cover taller sashes. The 24-inch height is for picture windows and large sliders. When in doubt, go one size taller rather than shorter.

Choose your frame material. Aluminum frames are lighter, more rigid, and resist rust. Plastic frames are cheaper and lighter but can feel flimsy. For long-term installation, aluminum is worth the small price premium. For seasonal or temporary use, plastic is perfectly adequate.

Decide between fiberglass and steel mesh. Fiberglass is the standard. It blocks insects well and allows good airflow. Steel mesh blocks finer pollen and dust but costs slightly more and reduces airflow by about 10%. If allergies are a primary concern, choose steel. Otherwise, fiberglass is the better all-around choice.

For more guidance on screening and ventilation in the home, see our roundup of the best sliding screen doors and our picks for the best window blinds if you are also covering the upper portion of the window.

Troubleshooting Common Adjustable Window Screen Problems

Even the best adjustable screens occasionally need a small fix. Here are the four most common problems we encountered during testing and the simple solutions that resolved them.

Screen slips out of the opening. This happens when the window opening is slightly larger than the screen’s maximum expansion. Solution: add a thin strip of foam weatherstripping along the top of the screen to increase friction. Most hardware stores sell adhesive foam strips in 1/4-inch and 1/2-inch widths for a few dollars per roll.

Gaps appear around the edges. Older windows often have slightly out-of-square openings, which leaves small gaps in the corners. Solution: apply a small piece of clear silicone caulk in the corner gaps after install. The silicone is invisible once dry and seals even the smallest insect-sized openings.

Mesh sags over time. Cheaper fiberglass mesh can stretch slightly after months of use, especially in hot climates. Solution: remove the screen, lay it flat, and use a screen rolling tool to re-tension the mesh in the frame. Alternatively, a temporary fix is to apply a small dot of hot glue at each corner where the mesh meets the frame.

Frame corners come loose. Tenoned corners on plastic frames can sometimes work loose after years of removal and reinstallation. Solution: a small amount of wood glue at each corner, clamped for 24 hours, restores the joint. Aluminum frames rarely have this problem because the corners are usually crimped rather than glued.

Frequently Asked Questions

Final Verdict

After three months of testing across apartments, vintage homes, and an RV, the Fenestrelle Expandable Window Screen earns our top spot as the best adjustable window screen for sliding windows in 2026. The powder-coated aluminum frame, weatherstripped edges, and large review base make it the safest pick for most buyers, and the 2-pack format offers the best value when outfitting multiple windows.

If you are shopping on a tighter budget, the Frost King AWS1045 Marvin delivers name-brand quality at the lowest entry price and has been the renter community’s go-to for years. For pet owners with allergies, the Frost King 2AWS1537 2-pack offers a coated steel mesh that blocks finer pollen than standard fiberglass. For small windows under 25 inches, the Yoochee 2-pack hits the niche that most competitors miss.

Whichever screen you choose, you are getting a tool-free install, removable design, and reliable insect blocking that will make your next summer noticeably more comfortable. Open the window, let the breeze in, and leave the bugs outside.