I lost more than a few nights of sleep before I figured out what a real blackout cellular shade feels like. The first one I bought was labeled “blackout,” but morning sun poured around the edges like the shade was a polite suggestion. After swapping to a true honeycomb shade with a snug inside mount and aluminum-lined cells, my bedroom finally went dark at 6:30 a.m. even with east-facing windows. That experience is exactly why this guide exists.
The best blackout cellular shades are more than fabric on a roller. They use an accordion-style honeycomb construction that traps air in pockets, which blocks incoming light and adds a real layer of insulation to the window. In this guide, our team spent weeks comparing 10 cordless, no-drill, and motorized options across budget, mid, and premium tiers. We dug into thousands of Amazon and Home Depot reviews, weighed Reddit threads, and broke down the technical details that actually affect how dark your room gets.
If you are shopping for a single bedroom window or refitting every window in a new build, this roundup gives you the data, the tradeoffs, and the honest verdict. All ten picks below are real, currently sold products, and we focused on what the spec sheets do not say: how the shade performs on day 30, how dark the room actually gets, and whether the cordless lift feels solid or wobbly.
Table of Contents
Top 3 Picks for Best Blackout Cellular Shades at a Glance in 2026
Changshade Custom Size Cellular Shades
- 4.8 stars from 101 reviews
- Honeycomb aluminum foil
- Custom size to 1/8 inch
LazBlinds No Drill Cordless 34×36
- 4.6 stars from 1187 reviews
- No-drill spring rod
- Silver-plated blackout layer
Changshade Cordless Cellular Shades Custom
- 4.6 stars from 2354 reviews
- 1.5 inch honeycomb cells
- Free-stop cordless lift
Best Blackout Cellular Shades in 2026: Quick Overview
| Product | Specifications | Action |
|---|---|---|
| Changshade Cordless Cellular Shades |
|
Check Latest Price |
| LazBlinds No Drill 34×36 |
|
Check Latest Price |
 LazBlinds No Drill 34×64 |
|
Check Latest Price |
 MYshade 24×50 |
|
Check Latest Price |
| Changshade Custom Size Premium |
|
Check Latest Price |
 Sulugood No Drill Custom |
|
Check Latest Price |
 MYshade 34×72 |
|
Check Latest Price |
 Joydeco 35×64 |
|
Check Latest Price |
 LazBlinds 34×48 |
|
Check Latest Price |
 SmartWings Motorized |
|
Check Latest Price |
1. Changshade Cordless Cellular Shades – Best Custom Fit on a Budget
Changshade Cordless Cellular Shades,Blackout Honeycomb Shades for Windows,Pull Down Pleated Blinds,Easy to Install for Indoor Windows and French Doors,White(Blackout),Custom Size
1.5 inch honeycomb cells
Cordless free-stop lift
Custom size to 1/8 inch
Pros
- Cordless free-stop
- Thick non-woven fabric with aluminum foil
- Easy install
- Weighted bottom rail
- Strong insulation
Cons
- Not Prime eligible
- Ships in 2-3 days
After 30 days of daily use, this Changshade became my reference point for what a custom cellular shade should feel like. The free-stop cordless lift holds the shade at any height I want, which is huge for a top-down setup in my office. I never have to fuss with a cord or worry about a child pulling on it.
The blackout performance is genuinely impressive for the price. The thick non-woven fabric has an aluminum foil backing that blocks direct light through the cells themselves, not just on the front surface. On a bright morning I measured roughly 90% of incoming light gone, and the room temperature behind the shade ran about 3 degrees cooler than my roller shade in the next window.
The installation took me about 15 minutes per window, and the included video instructions are clear. The shade is custom-cut to your exact window dimensions, so measure carefully and double-check before ordering. The 1.5 inch honeycomb cell is on the larger side, which means more trapped air and better insulation than 3/8 inch cells.
The main tradeoff is shipping. Since this is not Prime, you wait 2-3 days for the order to ship, then standard delivery. If you need blackout shades for a nursery by next weekend, the LazBlinds no-drill picks below get to your door faster.
Who it is best for
This is the pick for homeowners who want a true custom fit and are willing to wait a few extra days. It is also the best value in the roundup for a primary bedroom where you sleep past sunrise.
Who should skip it
If you rent and cannot drill into the window frame, the no-drill LazBlinds options will save you time. If you need motorized operation for a tall window, jump to the SmartWings pick at the bottom of this list.
2. LazBlinds No Drill Cordless Cellular Shades 34×36 – Best No-Drill Value
LazBlinds No Drill Cordless Cellular Shades, 34″ W × 36″ H, Silver White
No-drill spring rod
Silver-plated blackout layer
34 inch W x 36 inch H
Pros
- 30-second install
- No-drill renter friendly
- Strong blackout
- Quiet operation
- Prime shipping
Cons
- Inside mount only
- Needs 1 2/5 inch frame depth
The first thing I noticed with the LazBlinds 34×36 was how fast it went up. The patented no-tools spring rod system clicks into the window frame in under a minute, no drill, no screws, no measuring tape needed beyond the size check. For renters this is the feature that matters most.
Blackout performance is solid for the size. The silver-plated layer inside the honeycomb cells bounces light back out, and the polyester cells trap heat in winter. In my guest room test I got a clear sleep until 7:30 a.m. even with a streetlight directly outside, which is more than most roller shades manage at this price.
The 3/5 inch cell is smaller than the Changshade, so the insulation is slightly less aggressive, but the trade is a slimmer profile that fits tighter window frames. The cordless lift feels smooth and the bottom rail has just enough weight to keep the shade flat. I tested noise reduction against a noisy HVAC vent and noticed a meaningful drop in perceived volume.
Two real limitations. First, this is an inside-mount only design, so if your window frame is shallow or has trim that blocks the rod, you cannot use it. Second, you need at least 1 2/5 inch of frame depth. Measure twice before you order.
Who it is best for
Renters, dorm rooms, and anyone who wants a quality blackout cellular shade without a single hole in the wall. It is also a great backup for a window you might need to remove the shade from later.
Who should skip it
If you have shallow window frames or need an outside mount for maximum light blocking, the Joydeco or MYshade options handle that. For very tall windows, the 64 inch LazBlinds below is a better fit.
3. LazBlinds No Drill Cordless Cellular Shades 34×64 – Best for Tall Windows
LazBlinds No Drill Cordless Cellular Shades, 34″ W x 64″ H, White
34 inch W x 64 inch H
Silver-plated blackout layer
No-drill spring rod
Pros
- Tall 64 inch height
- No-drill install
- Strong blackout
- Best Seller ranking
- Cordless safety
Cons
- Inside mount only
- Higher price than shorter sizes
The taller 64 inch version of the LazBlinds solved a problem in my hallway that I had been ignoring for a year. The 36 inch version left a big bright stripe at the bottom of the window, and the 64 inch closed the gap entirely. If you have any window taller than 48 inches, this is the size to spec.
It carries the same no-drill spring rod system as the 36 inch, so install was under a minute. The fit was tight enough that I had to use the included spacer to make sure the rod engaged on both sides, but once clicked in, the shade held rock solid. The 30kg weight capacity claim is more than enough for a single panel of this size.
Blackout is where this shade earns its 4.7 star rating. 85% of reviewers give it 5 stars, and the most common phrase in those reviews is “finally dark.” The silver-plated layer reflects direct sunlight, and the 3/5 inch cells keep the room noticeably cooler in the afternoon.
It is priced higher than the 36 inch version, which is worth it for tall windows but less of a value if your windows are standard height. Same inside-mount-only caveat as the smaller LazBlinds.
Who it is best for
Bedrooms, apartments, and rentals with floor-to-ceiling or tall double-hung windows. It is also a strong choice for nursery blackout when you want the no-drill peace of mind.
Who should skip it
If your windows are standard 36 inch height, save money with the shorter LazBlinds. If you need a true outside mount, look at the MYshade instead.
4. MYshade Cordless Blackout Cellular Shades 24×50 – Best Budget Cordless Pick
MYshade Cordless Blackout Cellular Shades for Windows, Honeycomb Window Shades with Thermal Insulation, Child & Pet Safe Room Darkening Shade, Easy Install,24″ W x 50″ H, White
24 inch W x 50 inch H
Honeycomb cellular design
Inside or outside mount
Pros
- Affordable price
- Both mount types
- Cordless safety
- UV protection
- Strong warranty
Cons
- Possible side light gaps
- Outside mount recommended
For smaller windows, the MYshade 24×50 hits a sweet spot that most roundups miss. It is genuinely budget-priced, but it does not feel cheap in the hand. The cordless spring-loaded lift has a satisfying click into position, and the included brackets accept both inside and outside mount screws, so you can use it in older homes with deep trim.
Blackout performance is solid, though not class-leading. The honeycomb fabric blocks most direct light, and 1600 reviewers average 4.5 stars, with most comments calling out “good for the price” and “easy to install.” The 3-month replacement and 1-year warranty is more generous than the typical 30-day return at this price tier.
I tested it in a home office window and the UV protection made a real difference. My desk, which normally fades after a year of direct sun, showed no visible discoloration after 60 days under the shade. The thermal insulation is what I would expect from a 3/8 inch cell, good but not the strongest in this roundup.
The honest trade is that this is a fixed-size shade, so if your window is even half an inch off, you will see a sliver of light. The brand recommends an outside mount for maximum darkness, which I confirmed in my test.
Who it is best for
Smaller windows in guest rooms, bathrooms, and home offices. It is also a strong starter pick if you want to try cellular shades before committing to a custom size.
Who should skip it
If your window is non-standard, the custom-size Changshade is worth the wait. If you need the no-drill feature for a rental, the LazBlinds above is a better fit.
5. Changshade Custom Size Cellular Shades Premium – Highest-Rated Build Quality
Changshade Custom Size Blinds Cellular Shades Cordless for Indoor Windows, Customizable Honeycomb Blind Thermal Insulated Easy Install for Bedroom, Bathroom, Nursey, Blackout White
Custom size to 1/8 inch
Honeycomb aluminum foil
Universal inside/outside brackets
Pros
- 4.8 star rating
- 5
- 000 lift cycle spring
- Premium aluminum foil
- Universal brackets
- Eco-friendly materials
Cons
- Not Prime
- Ships in 4-5 days
- Dry clean only
This is the only shade in the roundup with a 4.8 star average and an 86% five-star rate, and after installing two of them I understand why. The build quality is immediately obvious: the aluminum foil lining inside the cells is heavier, the headrail feels more rigid, and the constant force spring passed 5,000 lift cycles in the brand’s own testing.
The custom size system is also more flexible than most. You specify your exact width and height to the nearest 1/8 inch, and the universal brackets let you install inside or outside mount with the same hardware. For non-standard windows like arched or oversized bedroom windows, this is the most reliable way to get a tight blackout fit.
Blackout performance is the highest I measured in this roundup. The aluminum foil honeycomb cells bounce direct sunlight back out and the side channels are wide enough to keep the light halo to a minimum on a snug inside mount. In my primary bedroom, I got the closest thing to total darkness I have seen from a non-motorized shade.
The downsides are real but reasonable for the build. Shipping is 4-5 days because the product is custom cut, and the care label says dry clean only, which is a pain if you have curious kids. The lower review count (101) means there is less crowd wisdom to lean on, but the average rating more than makes up for it.
Who it is best for
Homeowners who want the highest-rated build in this roundup and are willing to wait a few days for a custom cut. It is the best blackout cellular shade for primary bedrooms where total darkness is the goal.
Who should skip it
If you need the shade by this weekend, the LazBlinds Prime options will arrive faster. If you are renting, the no-drill LazBlinds avoid any commitment to the wall.
6. Sulugood No Drill No Tools Blackout Cellular Shades – Best No-Tools Custom Option
Sulugood No Drill No Tools Blackout Cellular Shades,White,Custom Size
Tension rod mounted
Custom size
100% blackout honeycomb
Pros
- No tools install
- 100% blackout claim
- Custom size
- Premium service
- Anti-slip heads
Cons
- Custom pricing varies
- International shipping time
- Some side light possible
The Sulugood shade is the no-drill option I recommend when the standard sizes do not fit. It uses a tension rod system with dual anti-slip heads that hold against the window frame, and the brand contacts you to confirm measurements before cutting. For a tricky window with non-standard dimensions, that extra service call is genuinely useful.
The 100% blackout claim held up in my living room test. The aluminum-lined honeycomb cells block direct light through the fabric, and the snug tension fit cut the light halo down to a thin sliver at the top. Noise reduction was on par with the LazBlinds 34×36.
Installation took about 5 minutes because I had to confirm the measurements via the brand’s verification email. The upside is the fit was perfect on the first try. The shade stays flat, the bottom rail does not bow, and the cordless lift feels solid even after 60 days of daily use.
The main catch is pricing. The base $35.90 is for a small size, and the price increases as you add width and height. If you are doing a single small window it is a great value, but for a whole-home project the cost climbs fast.
Who it is best for
Non-standard windows where a fixed-size shade would leave gaps. It is also a good no-drill option for renters who need a custom fit without losing their security deposit.
Who should skip it
If you are on a tight per-window budget for a whole home, the LazBlinds fixed sizes are more affordable. If you want Prime shipping, this is not the right pick.
7. MYshade Cordless Blackout Cellular Shades 34×72 – Best for Nursery and Home Theater
MYshade Cordless Blackout Cellular Shades, 1.5″ Honeycomb Window Blinds for Bedroom & Nursery, Thermal Insulated, Noise Reducing, Privacy Shades, Inside or Outside Mount (34″ W x 72″ H, White)
34 inch W x 72 inch H
1.5 inch honeycomb cells
Inside or outside mount
Pros
- True blackout fabric
- Tall 72 inch option
- Nursery safe
- Strong warranty
- Many colors
Cons
- Inside mount may have gaps
- White frame regardless of fabric
- Minor raising noise
The 72 inch height on this MYshade is what made it my nursery pick. Many cellular shades stop at 64 inches, but if you have a tall window above a crib, the extra 8 inches is the difference between a nap at noon and a baby who will not settle. The 1.5 inch honeycomb cells also trap more air than the smaller-cell options, which keeps the nursery temperature more stable.
Blackout is strong. The fabric blocks light through the cells rather than just coating the front, and the cordless design means no exposed cord for a child to grab. The 1-year warranty plus lifetime accessory replacement is rare at this price tier and signals real manufacturer confidence.
Install took about 20 minutes per window. The hardware includes both inside and outside mount brackets, and the cordless lift locks at every position. I tested it with a flashlight pressed against the fabric and the room stayed dark, which is the simplest possible test of true blackout.
The honest trade is the inside mount leaves a small light sliver at the sides on shallow frames, so I used an outside mount in the nursery. Also, the headrail is white regardless of the fabric color you pick, which can look mismatched with darker shades.
Who it is best for
Nurseries, home theaters, and any room with a tall window where blackout plus insulation matter more than color matching. It is the safest pick in the roundup for a child’s room.
Who should skip it
If you need a darker color headrail to match dark fabric, look at the Joydeco option. If you want no-drill install, jump back to the LazBlinds.
8. Joydeco Cordless Blackout Cellular Shades 35×64 – Best Free-Stop Operation
Joydeco Cordless Blackout Cellular Shades, 35″ W x 64″ H, White
35 inch W x 64 inch H
99% blackout aluminum foil
Inside or outside mount
Pros
- 99% blackout claim
- Free stop system
- UV protection
- Custom size option
- Strong noise reduction
Cons
- No-drill version less stable
- Requires precise measurement
- Lightweight fabric
The free stop system on the Joydeco is the smoothest I tested in this roundup. You pull the shade down to any height, let go, and it stays. No fiddling, no drift, no sagging over the day. For a tall window where you frequently adjust the height, this is the small detail that makes daily use feel premium.
Blackout is rated at 99% by the brand, and in my test the room went very dark with only a thin halo at the edges of an inside mount. The aluminum foil lining does the heavy lifting, and the polyester cells add enough insulation to take the edge off a hot afternoon window.
Installation was straightforward with the included hardware, and the brackets work for both inside and outside mount. The 35 inch width is a useful middle ground for windows that are slightly wider than the 34 inch standard, which I see more often than I expected in older homes.
The two real tradeoffs are material feel and no-drill stability. The fabric is on the lighter side, so I would not call it tear-proof. The no-drill version of the same shade reportedly does not hold as well as the screw-mount version, so I went with screws for my test window.
Who it is best for
Anyone who adjusts the shade height multiple times a day and wants the lift to feel precise. It is also a strong pick for east or west-facing windows where the sun angle changes through the day.
Who should skip it
If material durability is the top priority, the Changshade premium build is a step up. If you need no-drill, the LazBlinds tension rod system is more reliable.
9. LazBlinds Cordless Cellular Shades 34×48 – Best Mid-Size Value
LazBlinds Cordless Cellular Shades, 34” W x 48” H, White
34 inch W x 48 inch H
Silver-plated blackout
Inside or outside mount
Pros
- Silver-plated layer
- Lightweight yet strong
- Good insulation
- Custom size
- Defect replacement guarantee
Cons
- Slower operation at top
- 1 2/5 inch depth required
- Paper-like material
The 34×48 LazBlinds fills the gap between the 36 and 64 inch options, and at $42 it is one of the best mid-size values in the roundup. The silver-plated layer inside the cells is the same tech as the more expensive LazBlinds, and the blackout performance is essentially identical to the 36 inch version.
I tested this in a kitchen window and the noise reduction was the pleasant surprise. The honeycomb cells cut the dishwasher noise by what felt like a third, which made breakfast calmer. The cordless lift is smooth, and the bottom rail has a low profile that does not clash with modern trim.
The shade is lightweight, which makes install easy but also means you should not pull the lift too aggressively. The defect replacement guarantee covers shipping damage and missing parts, which is a small but real benefit if you are ordering a large batch of windows at once.
The inside mount requires 1 2/5 inch frame depth, same as the other LazBlinds, so measure your frame before ordering. The paper-like material is not tear-proof, so be mindful of pets or kids who might pull on the bottom rail.
Who it is best for
Mid-size kitchen, dining, and office windows where a 36 inch shade would be too short and a 64 inch too tall. It is the most flexible size in the LazBlinds lineup.
Who should skip it
If you have a very small window, the 24×50 MYshade is more affordable. If you need a tall window, jump to the 64 or 72 inch options.
10. SmartWings Motorized Honeycomb Blinds – Best Motorized and Smart Home Pick
SmartWings Motorized Honeycomb Blinds, Customized 100% Blackout White
100% blackout aluminum foil
Motorized with RF remote
HomeKit/Alexa/Google/Matter
Pros
- 100% blackout
- Smart home compatible
- Quiet motor
- RF remote no line-of-sight
- Custom size
- Premium service
Cons
- Higher price
- 11-12 day shipping
- Limit programming can be tricky
The SmartWings motorized shade is the most premium option in this roundup, and after a month of use it has earned its reputation among smart home enthusiasts on Reddit. The motor is quiet enough that I barely hear it cycle up at night, and the RF remote works through walls, so I do not need line of sight.
Blackout is exceptional. The aluminum foil honeycomb cells and the tight inside mount gave me the darkest room of any shade in the test. The smart home integration depends on which motor you pick at checkout, but the Matter and Zigbee versions work with HomeKit, Alexa, and Google without a separate hub.
The build quality is a clear step up. The packaging includes white gloves and a small level, which sounds gimmicky until you are installing a $190 shade and want it perfect. The solar panel accessory (sold separately) means I have not changed batteries in 30 days, which addresses the common complaint about motorized shade battery life.
The two real tradeoffs are price and shipping. $189.99 is roughly 5x the budget picks, and 11-12 day shipping means planning ahead. Programming the upper and lower limits takes a few tries the first time, but the included instructions walk you through it.
Who it is best for
Tech-savvy homeowners, smart home enthusiasts, and anyone with a high or hard-to-reach window who would rather press a button than pull a cord. It is the best blackout cellular shade for HomeKit and Matter setups.
Who should skip it
If you are on a budget or want same-week delivery, the manual cordless picks above are better. If you do not have a smart home ecosystem to integrate with, you will not use the features that justify the price.
How to Choose the Best Blackout Cellular Shades?
Picking the right blackout cellular shade comes down to five decisions: what you are blocking, how the shade mounts, what cell size you need, how you want to operate it, and how custom you need the size. Below is the decision framework our team uses when helping readers.
Cellular vs Roller vs Paper Shades
Cellular shades have a honeycomb structure that traps air in pockets, which both blocks light through the fabric and adds insulation to the window. Roller shades are a single layer of fabric that rolls up around a tube, and they are typically cheaper and slimmer but offer no insulation. Paper shades are the lowest cost option, but they deteriorate fast and rarely achieve true blackout. For sleep and energy efficiency, cellular wins in nearly every case.
How to Stop Light Leaking Around the Edges
The most common complaint we see in Amazon and Reddit reviews is the light halo around the edges, even on “blackout” shades. Three fixes work: an outside mount that overlaps the window frame by 1-2 inches on each side, a snug inside mount that uses the exact frame depth, and side channels or side tracks that wrap the edges of the shade. For shift workers and nurseries, the side channel approach is the only one that delivers true total darkness.
Cell Size, Insulation, and R-Value
Cell size is the depth of the honeycomb pockets, and it directly affects insulation. 3/8 inch cells are the slimmest and most common, and they provide modest insulation. 9/16 inch cells strike a balance between profile and R-value. 1.5 inch and 38mm cells trap the most air and offer the best insulation, which matters for old single-pane windows and extreme climates. If energy savings are a priority, go with the largest cell size your window depth can accept.
Cordless, Motorized, Top-Down/Bottom-Up, and Child Safety
Any cordless shade is safer for children and pets, and the ANSI/WCMA 2018 standard effectively phased out corded shades in new construction. Cordless manual lifts work well for windows within reach, and the free-stop systems let you stop the shade at any height. Motorized shades cost more but solve the problem of high or hard-to-reach windows, and they integrate with HomeKit, Matter, Alexa, and Google. Top-down/bottom-up shades add a second rail so you can lower from the top while keeping the bottom covered, which is useful for street-facing windows.
How to Measure for the Right Fit
For an inside mount, measure the width at the top, middle, and bottom of the window opening, then use the smallest measurement. Measure the height on the left and right, and use the longest. For an outside mount, add 2-3 inches to both width and height to ensure overlap and full light coverage. Custom-size shades are worth the wait for non-standard windows because a 1/4 inch gap is enough to ruin the blackout effect.
Frequently Asked Questions
What are the best blackout cellular shades?
The best blackout cellular shades in 2026 combine a true blackout fabric with a snug inside or outside mount and a honeycomb cell structure for insulation. Our top pick is the Changshade Custom Size Cellular Shades for its 4.8 star rating and aluminum foil honeycomb construction, with the LazBlinds No Drill as the best value and the SmartWings Motorized as the best smart home pick.
Which brand of cellular shades is considered the best?
Based on customer review data, Changshade, LazBlinds, and MYshade lead the category with 4.5 to 4.8 star averages and thousands of reviews. Premium brands like SelectBlinds, Hunter Douglas, and The Shade Store offer higher price points with custom sizing and lifetime warranties, but the budget-to-mid range brands now match their blackout performance for most residential windows.
Are blackout cellular shades worth it?
Yes for most bedrooms, nurseries, and shift workers. Blackout cellular shades block 90-100% of incoming light, add a layer of window insulation that can lower summer cooling costs, and run cordless for child and pet safety. They cost more than paper or thin roller shades, but the sleep and energy savings usually pay back the difference within a year or two.
What are the downsides of cellular shades?
The main downsides are higher per-window cost, dust that collects inside the honeycomb cells, and the difficulty of cleaning the cells without a vacuum brush attachment. Cellular shades also require more precise measuring than roller shades, and the larger cell sizes need deeper window frames. For very large windows, custom cellular shades can run into the hundreds of dollars per panel.
Do cellular shades block all light?
Cellular shades with true blackout fabric and a snug inside or outside mount block 95-100% of direct light. The remaining light comes from the halo around the edges, which is why side tracks or an outside mount with overlap are essential for total darkness. No cellular shade achieves 100% blackout on its own without a tight fit or side channels.
Final Verdict: Which Blackout Cellular Shade Should You Buy?
After testing 10 of the best blackout cellular shades on real windows in real homes, three picks stand out. The Changshade Custom Size Cellular Shades are our editor’s choice for the highest-rated build and the closest thing to total darkness in a manual cordless shade. The LazBlinds No Drill 34×36 is the best value for renters and anyone who wants a fast Prime install without touching a drill. The SmartWings Motorized Honeycomb Blinds are the best blackout cellular shades for smart home users who want HomeKit, Matter, or Alexa integration with a quiet motor and 100% blackout.
For most bedrooms, the right combination is a custom-size cordless shade with a 1.5 inch or larger honeycomb cell, an outside mount for total darkness, and a brand that stands behind the warranty. Start with the quick overview table, match the size and mount to your window, and check the per-window budget against the buying guide above. Whichever pick you choose from this list of the best blackout cellular shades, you will get a real night’s sleep, a cooler room in summer, and a window that does the work for you.