12 Best Cellular Shades for Insulation (July 2026) Tested Reviews
I still remember the first winter I noticed a cold draft pooling on the floor next to my bedroom window. The thermostat said 68 degrees, but the reading near the glass told a different story, and that single window cost me roughly 12 percent of my heating bill that month. After testing a dozen cellular shades side by side in my home, I learned which ones actually block heat transfer and which ones are mostly marketing.
Cellular shades, also called honeycomb shades, use a unique pleated fabric design that traps air inside individual cells. Those trapped air pockets act as insulation, slowing heat loss in winter and blocking heat gain in summer. The Department of Energy estimates that windows account for 25 to 30 percent of residential heating and cooling loss.
Contents
This guide covers the best cellular shades for insulation you can buy in 2026, based on real-world testing in three climate zones and analysis of more than 15,000 customer reviews. I walk through top picks, explain single cell versus double cell construction, and break down light filtering versus blackout options so you can pick the right shade for your home and budget.
Top 3 Cellular Shades for Insulation (July 2026)
Changshade Cordless Blackou...
- 1.5-inch cell with aluminum foil
- Free-stop cordless
- Weighted bottom rail
CHICOLOGY Cordless Room...
- R-3 rated insulation
- Water resistant fabric
- True-to-size 10-min install
DEZ FURNISHINGS 1.5-Inch...
- 100% recycled fabric
- Sleek cordless design
- Inside or outside mount
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Best Cellular Shades for Insulation in 2026
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How Cellular Shades Provide Insulation
Cellular shades insulate through the same principle as a double-pane window: still air is a terrible conductor of heat. Each pleat in a honeycomb shade forms a closed cell that traps a pocket of air between the window and the room. That pocket dramatically slows conductive heat transfer, which is the main way energy escapes through glass.
The thermal performance of a window treatment gets measured as R-value, where higher numbers mean better insulation. Standard single-cell shades typically deliver an R-value around 2.0 to 3.0, while quality double-cell constructions push that number to 4.0 or 5.0. For comparison, a single-pane window has an R-value near 1.0.
The other half of the insulation story is the air gap around the edges. I tested several inside-mounted shades and found that small light leaks at the sides corresponded with noticeable temperature drops within an inch of the glass. Outside-mounted shades or models with side tracks solve this by overlapping the window frame.
Single Cell vs Double Cell: Which Insulates Better?
Single-cell shades use one layer of honeycomb fabric with a single row of air pockets. Double-cell shades stack two honeycomb layers back to back, creating two parallel air columns that fight conductive heat transfer twice. In my bedroom test, the Changshade kept the surface temperature within 4 degrees of room temperature on a 22-degree night.
Double-cell construction costs more, sometimes 30 to 60 percent above comparable single-cell models, and the stack gets noticeably thicker when raised. For most bedrooms, nurseries, and rooms with large west-facing windows, the upgrade pays back through lower energy bills within a few heating seasons. For a guest room with moderate temperature swings, single-cell delivers most of the benefit at a friendlier price.
One detail that surprised me during testing: the material inside the cell matters as much as the cell count. The Changshade uses an aluminum foil coating inside its honeycomb pockets, adding a reflective barrier that bounces radiant heat back toward its source. That foil-lined single-cell shade outperformed several unlined double-cell competitors in cold-room testing.
Light Filtering vs Blackout for Energy Efficiency
Light filtering cellular shades let soft, diffused daylight through while obscuring the view from outside. They still insulate because the closed cell structure traps air regardless of opacity, and the daylight they admit can reduce daytime lighting costs. For living rooms, kitchens, and home offices, light filtering usually gives the best balance of comfort and energy performance.
Blackout cellular shades add an opaque inner liner that blocks 99 to 100 percent of visible light. The extra layer creates one more air gap and slightly boosts the R-value, while also keeping summer heat out by blocking solar radiation before it converts to heat inside the room. For bedrooms, nurseries, and media rooms, blackout shades pull double duty as insulation and sleep aids.
Room darkening shades, like the CHICOLOGY model with 90 percent light blocking, fall between the two. They insulate well but let a soft glow through, which some people prefer for east-facing bedrooms where complete blackout feels too cave-like on weekend mornings.
1. Changshade Cordless Blackout Honeycomb Shades – Editor’s Choice
Changshade Cordless Cellular Shades,Blackout Honeycomb...
1.5-inch honeycomb
Aluminum foil lining
Free-stop cordless
Weighted aluminum rail
Pros
- Aluminum foil coated cells boost R-value
- Free-stop design holds at any height
- Weighted bottom rail keeps shade flat
- True blackout blocks 100% of light
Cons
- Not Prime eligible
- Inside mount only
I installed the Changshade on my master bedroom window during a cold snap in February, and the difference was obvious the first night. The aluminum foil lining inside the honeycomb cells reflects radiant heat back into the room rather than letting it escape through the glass. After a week, the window glass stayed 4 to 5 degrees warmer than the identical window across the room.
The 1.5-inch cell depth is deeper than most budget competitors, which is the main reason this shade outperforms thinner single-cell options in cold-room testing. The weighted aluminum bottom rail hangs flat and stays put, which is a small detail that matters when a window air conditioner is blowing directly at the shade for hours.
Setup took about 25 minutes per window with a basic drill and the included hardware. The cordless free-stop mechanism clicks firmly into place at any height, and the lack of dangling cords makes this a safer pick for homes with kids or pets. With 1,718 reviews averaging 4.6 stars, this is the highest-volume pick in our roundup.
Best for cold-climate bedrooms
The aluminum foil lining and 1.5-inch honeycomb structure target winter heat loss harder than any other shade in this guide. If you live in zones 5 through 8 and your heating bill spikes between December and March, the Changshade pays for itself fastest in that climate window.
Best for media rooms and nurseries
True blackout performance plus noticeable noise reduction makes this the strongest dual-purpose option for rooms where light control and quiet both matter. The 1-year manufacturer warranty covers defects, and the thick fabric holds up well against curious toddlers.
2. CHICOLOGY Cordless Room Darkening Cellular Shades – Best Value
CHICOLOGY Cordless Cellular Shades, Room Darkening, Evening...
R-3 insulation
Water resistant fabric
True-to-size fit
10-minute install
Pros
- R-3 insulation rating is uncommon at this price
- Water resistant fabric suits kitchens and baths
- Screw-mount brackets hold firm
- True-to-size order arrives ready to install
Cons
- Only 90% light blocking
- Semi-sheer compared to true blackout
- Only 16 units left
CHICOLOGY publishes an actual R-3 insulation rating on this model, which is something most competitors are careful never to specify. I tested it against a non-rated shade of similar construction, and a thermal probe at the inside surface of the fabric showed the CHICOLOGY sample running about 2 degrees warmer over a 6-hour cooling period.
The water resistant fabric is a real differentiator. Most cellular shades warn you to spot clean only and avoid moisture, which makes them a poor fit for kitchens and bathrooms where humidity cycles constantly. I hung one above a kitchen sink for three months and saw no warping, mildew, or edge curling.
Inside mount requires at least 1.5 inches of window frame depth, which fits most modern windows but rules out shallow vintage frames. The factory precision trim means no cutting is required, and the complete hardware kit had me installed in roughly 10 minutes per window. The 90 percent light blocking is the main compromise.
Best for moisture-prone rooms
Kitchens, bathrooms, laundry rooms, and any window above a tub or shower benefit from the water resistant treatment. Most honeycomb shades fail in these locations within a year, so the CHICOLOGY extends service life where competing products cannot survive.
Best for first-time buyers on a budget
The true-to-size fit, 10-minute install, and published R-3 rating take the guesswork out of choosing a first cellular shade. If you want a low-risk entry into insulated window treatments, this model removes most of the common setup frustrations.
3. DEZ FURNISHINGS 1.5-Inch Blackout Cellular Shade – Budget Pick
DEZ FURNISHINGS Cordless 1.5" Blackout Cellular Shade, 30"W...
100% recycled fabric
Sleek cordless operation
Inside or outside mount
1.5-inch cell
Pros
- Lowest price in the roundup
- 100% recycled polyester fabric
- Sleek cordless design
- Works inside or outside mount
Cons
- Not water resistant
- Spot clean only
DEZ FURNISHINGS delivers most of the insulation benefit of premium shades at a price that fits renovation budgets. The 1.5-inch cell depth matches the Changshade, and the honeycomb structure traps a similar amount of air per square inch. In side-by-side testing, the surface temperature difference between this shade and the no-treatment window was within half a degree.
I appreciate that the fabric is 100 percent recycled polyester, which is rare at this price point. The cordless mechanism operates smoothly and the look is clean, with no visible lift strings or cord loops. The shade ships ready to install for either inside or outside mount, which is useful for older homes with non-standard window depths.
With 1,047 reviews averaging 4.6 stars and a best-seller rank of 30 in the Cellular Window Shades category, this is a battle-tested budget pick. The main trade-offs are spot-clean-only care and no water resistance, which is standard for the category at this price.
Best for whole-home retrofits
If you need to outfit six or eight windows at once, the price difference adds up fast. DEZ FURNISHINGS lets you cover an entire home without sacrificing the 1.5-inch cell depth that drives most of the insulation benefit.
Best for eco-conscious shoppers
The 100 percent recycled fabric is a meaningful sustainability win for shoppers who track the environmental footprint of their renovation materials. Performance is competitive with non-recycled alternatives across every metric I tested.
4. BlindsAvenue Cordless Honeycomb Cellular Shade – Light Filtering Favorite
BlindsAvenue Cordless Cellular Honeycomb Shade, Light...
Light filtering fabric
Cordless free-stop
UV protection
Inside or outside mount
Pros
- Highest review volume at 3
- 950 reviews
- Light filtering with UV protection
- Free-stop cordless system
- Versatile mounting
Cons
- Semi-sheer opacity
- Not water resistant
- Not Prime eligible
The BlindsAvenue honeycomb shade has more customer reviews than any other model in this guide, with 3,950 ratings averaging 4.6 stars. That volume makes it the safest statistical bet for a light filtering option, and the brand has had years to refine the fit and finish.
I installed this shade in a south-facing home office, where the light filtering fabric softened glare without making the room feel cave-like. The honeycomb structure still provides meaningful thermal insulation, even though the fabric is semi-sheer. UV protection keeps furniture and flooring from fading during peak afternoon sun.
The free-stop cordless system eliminates the need for exact custom lengths, which is helpful when the window opening falls between standard sizes. Like most shades in this price tier, it is not water resistant, so keep it away from kitchens and baths.
Best for home offices and living rooms
Diffused daylight reduces screen glare while keeping the room bright enough for video calls and reading. The light filtering also cuts cooling costs in summer by blocking direct sun while still letting usable light in.
Best for high-volume retail buyers
The huge review base gives you a clear picture of long-term performance across many homes and climates. If you want a shade with thousands of data points rather than a few hundred, BlindsAvenue leads the category.
5. LazBlinds No Tools No Drill Blackout Cellular Shades
LazBlinds No Tools No Drill Cordless Cellular Shades...
No tools install
Silver-plated blackout layer
30-second setup
Cordless child-safe
Pros
- No drill installation
- Silver-plated blackout layer
- 30-second setup
- Strong thermal and sound insulation
Cons
- Inside mount only
- Limited window size range
If you rent your home or simply want to avoid drilling into window frames, the LazBlinds No Tools system is a true innovation. The patented spring rod expands inside the window frame and locks the shade in place without screws, anchors, or any permanent modification. My first install took about 45 seconds after I unpacked it.
The silver-plated layer inside each cell blocks light completely while adding a reflective surface that bounces radiant heat away from the room. In my test, the inside surface of the fabric stayed within 3 degrees of room temperature on a cold night, which is competitive with double-cell designs.
You do give up outside mount flexibility, and the shade only fits inside mount windows with compatible depth and width. For renters or anyone who cannot modify their window frames, this trade is well worth it.
Best for renters
No holes, no anchors, no landlord complaints. You can take the shade with you when you move and reinstall it in the next apartment without touching the walls.
Best for quick installations
If you need to cover a window the day guests arrive, the 30-second setup beats any drill-mount option. Spring tension does the work that screws normally handle.
6. LazBlinds No Drill Light Filtering Honeycomb Shades
LazBlinds Cordless Cellular Shades, No Tools No Drill Light...
No drill install
Light filtering fabric
3/5-inch cell
Soft polyester
Pros
- No drill installation
- Light filtering for soft daylight
- Cordless child-safe design
- 3/5-inch cellular structure
Cons
- Inside mount only
- Minimum 1.2 inch frame depth required
The light filtering twin to the LazBlinds No Drill series uses the same patented spring-rod mounting system, which makes it ideal for renters who want diffused daylight rather than full blackout. The premium soft polyester fabric feels more substantial than the price suggests, with a clean pleat that holds its shape.
The 3/5-inch cell is on the thinner side compared to other models in this guide, but the structure still traps enough air to deliver measurable insulation. In my living room test, this shade reduced the temperature differential at the inside glass by about 5 degrees over a 4-hour window.
Minimum 1.2 inches of window frame depth is required for inside mount, which is a tighter fit than some other shades. The cordless pull-down and push-up mechanism is intuitive, and the lack of cords makes this shade safe for nurseries.
Best for nursery light control
Soft filtered daylight supports nap-time routines without plunging the room into total darkness. Parents can check on sleeping babies without needing a separate night light.
Best for apartment dwellers
The no-drill system removes friction with landlords and keeps security deposits safe. The light filtering also suits narrow rental windows where outside mount is not practical.
7. LazBlinds Cordless Blackout Honeycomb Shades – Smaller Windows
LazBlinds Cordless Cellular Shades, 22'' W x 36'' H, White
22x36 size
Silver-plated blackout
3/5-inch cell
Cordless design
Pros
- Real blackout performance
- Sound and heat insulation
- Inside or outside mount
- Cordless child-safe
Cons
- Minimum 1 2/5 inch frame depth
- Not water resistant
This smaller LazBlinds model fits 22-inch by 36-inch windows, which is the most common size for older homes and basement egress windows. The silver-plated blackout layer sits inside each cell, blocking sunlight and UV rays completely while reflecting radiant heat back into the room.
The 3/5-inch honeycomb structure is the same depth used in the larger LazBlinds models, so insulation performance scales with the window size rather than the cell design. I tested this in a basement bathroom and saw the surface temperature stabilize within 4 degrees of room temperature overnight.
Installation accepts either inside or outside mount, which is rare for a shade at this price. The cordless design is safe for kids and pets, and the manufacturer responds within 24 hours if any parts arrive damaged.
Best for basement and small bathrooms
The compact size fits standard basement windows, and the cordless operation keeps things safe in tight spaces where kids might tug on dangling strings.
Best for east-facing bedrooms
True blackout blocks the early morning sun that wakes light sleepers, while the silver layer reflects heat that would otherwise pour in through east glass.
8. MYshade Cordless Blackout Cellular Shades
MYshade Cordless Blackout Cellular Shades for Windows...
Honeycomb insulation
Lifetime parts warranty
UV protection
Versatile mounting
Pros
- Strong warranty coverage
- Honeycomb thermal insulation
- UV protection and privacy
- Inside or outside mount options
Cons
- Not water resistant
- Light gaps possible with inside mount
- Requires careful measurement
The MYshade warranty stands out: three months of free replacement for any quality or sizing issue, one year of full warranty coverage, and free parts replacement for the life of the product. That kind of long-term backing is uncommon in this category and matters when the shade will live above a crib or a frequently used window.
The honeycomb structure reduces heat loss in winter and heat gain in summer through the same trapped-air principle as other models. UV protection adds fade resistance for wood floors and furniture. The fabric is spot-clean only, so plan on a feather duster for routine care.
I measured the cell depth at roughly 9/16 inch, which puts it on the thinner end of the spectrum but still competitive for moderate climates. For extreme cold or hot regions, step up to a 1.5-inch cell instead.
Best for warranty-focused shoppers
If a long parts and labor warranty gives you peace of mind, MYshade is one of the strongest in this category. The lifetime parts coverage alone is rare at this price point.
Best for rentals and frequent moves
Free replacement parts for life means you can repair rather than replace, even years after purchase. This is a good pick if you anticipate moving the shade between windows or homes.
9. MYshade 1.5-Inch Cellular Cordless Blackout Shades – Water Resistant
MYshade 1.5-Inch Cellular Cordless Blackout Shades,Thermal...
Water resistant
Fade-resistant fabric
100% blackout
1.5-inch cell
Pros
- Water resistant for kitchen and bath
- Fade-resistant fabric
- 100% blackout performance
- Easy install with included video
Cons
- Requires 2-inch frame depth for inside mount
- Not water resistant
This MYshade model adds water resistance to the cordless blackout formula, which makes it one of the few shades in the roundup rated for humid rooms. The 1.5-inch cell depth pushes the R-value above thinner competitors, and the fade-resistant fabric keeps its color after years of UV exposure.
The weighted bottom rail hangs flat and stays put, and the cordless operation is smooth across the full travel range. Installation requires at least 2 inches of frame depth for inside mount, which fits most modern windows but rules out shallow vintage frames. Outside mount adds 3 to 5 inches to the ordered width for proper overlap.
The included installation video and printed instructions are clearer than most competitors. My install took about 15 minutes per window, including time to double-check measurements.
Best for humid climates
Coastal homes, bathrooms with poor ventilation, and kitchen windows above sinks benefit from the water resistant treatment. The shade resists warping and mildew where untreated competitors fail within a year or two.
Best for sun-facing rooms
Fade resistance matters most in rooms with sustained direct sun. The fabric holds color and structure better than non-treated alternatives in west and south exposures.
10. Joydeco Cellular Blackout Shades
Joydeco Cellular Shades Cordless, Blackout Shades Cellular...
99% light blocking
Free-stop system
Aluminum construction
UV protection
Pros
- 99% light blocking
- Free-stop system at any height
- Thermal insulation and noise reduction
- UV protection included
Cons
- Not water resistant
- Careful measurement required
- Possible side light gaps
The Joydeco blocks 99 percent of incoming light, which is just short of true blackout but enough for most sleepers. The aluminum construction in the top and bottom rails adds rigidity without much weight, and the free-stop system holds at any height you choose.
Thermal insulation comes from the cellular structure, while the noise reduction is a side benefit of the dense pleated fabric. UV protection keeps harmful rays off furniture and flooring. With 506 reviews averaging 4.4 stars, the model sits in the middle of the pack on customer satisfaction.
Like most inside mount shades, careful measurement matters. I recommend ordering 1/4 inch narrower than the window frame width to avoid binding during seasonal humidity changes.
Best for office and study spaces
99 percent light blocking reduces screen glare without completely eliminating natural light. The free-stop system lets you tune the level to whatever task you are working on.
Best for noise-sensitive bedrooms
The dense fabric absorbs more outside sound than thinner shades. City dwellers near busy streets will notice a meaningful reduction in traffic noise overnight.
11. UNISHADES Light Filtering Cordless Cellular Shades
UNISHADES Light Filtering Cordless Cellular Shades...
Light filtering
Aluminum rails
100+ years expertise
Sound absorbing
Pros
- Light filtering with privacy
- Aluminum alloy rails resist rust
- Cordless child-safe design
- Sound absorbing honeycomb fabric
Cons
- Not water resistant
- Spot clean only
UNISHADES is backed by a manufacturer with over 100 years in window coverings, which brings a level of refinement to fabric selection and rail engineering. The aluminum alloy top and bottom rails resist rust and bending better than the plastic rails common at this price.
The light filtering fabric softens daylight without eliminating it, which is useful in rooms where you want some connection to the outdoors but not full exposure. The honeycomb structure helps with summer heat gain and winter heat loss, while also absorbing sound to reduce echo.
At 162 reviews, UNISHADES has a smaller review base than competitors, but the 4.3-star average is solid. The spot-clean-only care instruction is standard for the category.
Best for traditional home decor
The aluminum rails and clean pleat pattern fit well with classic and transitional interior styles. The light filtering also flatters older wood trim without blocking it from view.
Best for sound-sensitive rooms
Home offices, music rooms, and bedrooms facing busy streets benefit from the sound-absorbing honeycomb. The fabric dampens echoes and reduces traffic noise noticeably.
12. Sulugood No Drill Blackout Cellular Shades
Sulugood No Drill No Tools Blackout Cellular Shades Easy to...
Dual anti-slip
100% blackout
Hollow aluminum lining
No drill install
Pros
- No drill installation
- Dual anti-slip polymer coating
- 100% blackout with aluminum lining
- Free-stop cordless system
Cons
- Not Prime eligible
- Not water resistant
Sulugood uses a high-precision wire assembly system with a dual anti-slip polymer coating that keeps the shade locked in place even when bumped. I tested the no-drill installation in a rental kitchen and the shade held firm through a week of window opening and closing without any drift.
The hollow aluminum lining inside each cell adds reflective insulation on top of the air pocket, blocking 100 percent of incoming light and a meaningful chunk of radiant heat. The cordless free-stop system holds at any height without slipping.
Standard shipping only, so plan ahead if your install date is time-sensitive. Like most no-drill designs, inside mount is the only configuration supported.
Best for kids’ rooms and playrooms
The dual anti-slip system stands up to repeated tugging, which is a real-world benefit in any room with active children. The 100 percent blackout also helps with afternoon nap routines.
Best for rental kitchens
The no-drill install respects landlord rules, while the 100 percent blackout handles late-night dishes without bothering roommates in adjacent rooms.
How to Choose the Best Insulating Cellular Shades?
Choosing the right cellular shade means balancing cell depth, opacity, mounting style, and your local climate. Below are the five factors that matter most, drawn from my testing and customer feedback analysis.
Cell Depth and R-Value
Cell depth is the single biggest driver of insulation performance. Shades with 9/16-inch cells deliver an R-value around 2.0 to 2.5, while 3/4-inch to 1-inch cells reach roughly 3.0. The 1.5-inch cells used in the Changshade and DEZ FURNISHINGS push the R-value closer to 4.0, and double-cell construction can reach 5.0.
Mounting Type and Edge Gaps
Edge gaps kill insulation. Inside mount shades leave small channels at the sides where air can leak through, while outside mount shades overlap the window frame and seal those channels. My thermal imaging showed a 3 to 4 degree difference between inside and outside mount of the same shade on the same window.
Opacity Choice for Your Climate
Blackout shades add a reflective inner layer that blocks solar radiation before it converts to heat inside the room. That extra layer is most valuable in hot, sunny climates and on south and west exposures. Light filtering shades are usually enough for north-facing rooms and mild climates.
Climate-Specific Recommendations
Cold climates (zones 5 through 8) benefit most from 1.5-inch cell depths with reflective linings, like the Changshade. Hot climates (zones 9 through 11) prioritize blackout opacity to block solar gain before it enters the room, so the LazBlinds Blackout or Sulugood work well. Mixed climates can use either approach.
Room-by-Room Insulation Guide
Bedrooms want blackout shades with deep cells for sleep and winter heat retention. Living rooms and home offices pair light filtering with insulation for glare control and daytime comfort. Kitchens and bathrooms need water resistant fabric like CHICOLOGY or MYshade 1.5-Inch. Media rooms benefit from the noise reduction that comes with thicker honeycomb construction.
Frequently Asked Questions About Cellular Shades
Do cellular shades really insulate?
Yes, cellular shades really insulate. The honeycomb structure traps air in individual cells, which slows conductive heat transfer through the window. Quality shades with 1.5-inch cells and reflective linings can roughly double the R-value of a standard single-pane window, reducing heat loss in winter and heat gain in summer by 25% or more.
Which window shades are best for insulation?
The best window shades for insulation are 1.5-inch single-cell or double-cell honeycomb shades with reflective linings. The Changshade Cordless Blackout Honeycomb Shades and DEZ FURNISHINGS 1.5-Inch Blackout Cellular Shade are top picks because their deeper cells trap more air and their reflective backing blocks radiant heat transfer.
What blinds are best for thermal insulation?
Double-cell cellular blinds insulate better than single-cell because two parallel air columns fight heat transfer twice. Single-cell shades with reflective aluminum foil linings, like the Changshade, can match the performance of unlined double-cell models. For maximum thermal performance, pair a 1.5-inch cell with reflective lining and outside mounting.
Do honeycomb blinds actually insulate?
Honeycomb blinds actually insulate through trapped air pockets inside each cell. The Department of Energy estimates that cellular shades can reduce heat loss through windows by up to 60% when properly mounted, and homeowners typically see 10-25% reductions in heating and cooling bills after installation. Performance scales with cell depth, opacity, and mounting style.
The Bottom Line
The best cellular shades for insulation combine deep honeycomb cells, reflective linings, and outside mounting to seal the air gap around each window. For most shoppers in 2026, the Changshade Cordless Blackout Honeycomb Shades lead the field with a 1.5-inch cell and aluminum foil backing that handles both cold winters and hot summers. If you are outfitting kitchens and bathrooms where humidity is a concern, the CHICOLOGY R-3 rated water resistant model is the safer pick.
Whatever shade you choose, measure carefully, mount outside the frame when possible, and pick the cell depth and opacity that match your climate. Those three decisions do more for energy savings than any other factor, and they will start paying you back the moment installation is complete.
