Double cell cellular shades use two rows of honeycomb-shaped air pockets to trap air at the window, delivering superior insulation and energy savings over single-cell designs. This guide explains how they work, cell sizes, opacity options, sizing, costs, installation, and care so you can choose the most efficient shade for your home.
- What Double Cell Shades Are
- How the Honeycomb Insulates
- R-Value and Energy Savings
- Cell Size Options
- Opacity and Light Control
- Measuring for the Right Fit
- Lift and Control Options
- How to Choose the Right Shade
- Installation Overview
- What They Cost
- Maintenance and Care
- Mistakes to Avoid
- Best Rooms for Double Cell Shades
- Noise Reduction Benefits
- Color and Light Glow
- Durability and Lifespan
- Single Cell vs Double Cell: When Each Wins
- Custom Sizing and Special Shapes
- Final Thoughts
What Double Cell Shades Are
Cellular shades, also called honeycomb shades, fold into rows of hexagonal cells that trap air. A double cell version stacks two layers of these cells back to back, creating two insulating air pockets instead of one. That extra layer boosts thermal performance, making double cell shades a top choice for energy-conscious homeowners in hot or cold climates.
How the Honeycomb Insulates
The trapped air inside each honeycomb cell acts as a thermal buffer, slowing heat transfer through the window. In winter, the cells keep warm indoor air from escaping; in summer, they block heat from entering. Double cell construction doubles the air barrier, which is why these shades post some of the highest R-values among fabric window treatments.
R-Value and Energy Savings
R-value measures resistance to heat flow, and higher is better. Single cell shades typically offer an R-value around 2 to 3, while double cell shades can reach R-4 to R-5 or higher depending on cell size and fabric. Windows are a major source of heat loss, so shades with strong R-values can noticeably cut heating and cooling costs over a season.
Cell Size Options
Double cell shades come in small cell sizes, commonly 3/8 inch and 1/2 inch. Smaller 3/8-inch cells create a tighter, more structured look and pack more insulating pockets into the same height, which suits smaller windows. The 1/2-inch size gives a slightly softer fold. Because double cell already adds insulation, even the smaller cells deliver excellent thermal performance.
Opacity and Light Control
Fabrics range from sheer and light-filtering to room-darkening and blackout. Light-filtering fabrics glow softly and maintain daytime privacy, ideal for living areas. Room-darkening and blackout fabrics block most or nearly all light, perfect for bedrooms and nurseries. Blackout cellular fabrics pair especially well with double cell construction, combining darkness with the highest insulation for restful, energy-efficient sleep.
Measuring for the Right Fit
For an inside mount, measure the window width at top, middle, and bottom, using the narrowest, and check that the recess depth meets the shade’s minimum, usually around 1 inch. Measure height at three points and use the longest. For an outside mount, add 1.5 to 3 inches on each side and above the opening to maximize light blockage and insulation coverage.
Lift and Control Options
Cellular shades come with corded, cordless, top-down bottom-up, and motorized controls. Cordless lift is safest and cleanest. Top-down bottom-up lets you lower the top for light while keeping the bottom raised for privacy, a favorite for street-facing rooms. Motorized options add remote and app control, convenient for tall or hard-to-reach windows you adjust often.
How to Choose the Right Shade
Prioritize double cell where insulation matters most, such as large or drafty windows. Choose blackout fabric for bedrooms and light-filtering for living spaces. Pick cordless or motorized for safety, and consider top-down bottom-up for flexible privacy. Match cell size to window scale, favoring 3/8 inch for smaller windows and 1/2 inch for larger expanses.
Installation Overview
Installation is DIY-friendly. Mark and mount the brackets level, either inside the recess or above the window for an outside mount, drilling pilot holes and using anchors in drywall. Snap the headrail into the brackets, attach any valance, and test the lift through its full travel. A standard window takes about 20 to 30 minutes with a drill and level.
What They Cost
Double cell cellular shades typically run $50 to $180 per window for standard sizes, with blackout fabrics and specialty lifts costing more. Cordless adds a small premium, and motorization can add $100 to $250 per shade. Though pricier than basic shades, the energy savings from their high R-value can offset part of the cost over time.
Maintenance and Care
Dust the cells regularly with a soft brush attachment on a vacuum set to low suction, working across the folds. For spots, blot gently with a mild soapy cloth and let air-dry; avoid soaking, which can distort the honeycomb. Occasionally use canned air to blow dust from inside the cells. Check the lift mechanism periodically to keep travel smooth.
Mistakes to Avoid
Do not choose single cell where insulation is the goal, since double cell performs noticeably better. Avoid skipping outside mounts on drafty windows, where extra coverage seals light and air gaps. Do not scrub or soak the delicate fabric. And resist corded lifts in homes with children, since cordless and motorized options are far safer and look cleaner.
Best Rooms for Double Cell Shades
These shades pay off most in rooms with big heating and cooling demands. West-facing rooms that bake in afternoon sun benefit from the heat-blocking cells, and bedrooms gain both darkness and insulation for restful, energy-efficient sleep. They also suit sunrooms, nurseries, and any drafty older window where comfort suffers. In mild interior rooms with little temperature stress, a single cell shade may be enough, so concentrate double cell shades where the thermal payoff is greatest.
Noise Reduction Benefits
The same trapped air that insulates against temperature also dampens sound. The double honeycomb structure absorbs and blocks a portion of outside noise, softening traffic, lawn equipment, and neighborhood sounds. While no fabric shade fully soundproofs a window, homeowners near busy streets often notice a quieter, calmer room after installing double cell shades. Pairing them with an outside mount that seals edge gaps further reduces the sound sneaking around the window frame.
Color and Light Glow
Cellular fabrics come in a wide palette, and color affects both the room’s feel and how the shade glows. Light neutrals brighten a space and diffuse a warm daytime glow, while darker fabrics absorb more light for a cozier, dimmer effect. Remember the exterior view too, since light-colored shades keep a uniform look from outside. For bedrooms, a room-darkening or blackout fabric in a calm neutral usually balances aesthetics and function best.
Durability and Lifespan
Quality double cell shades hold their shape for many years thanks to spun-bonded polyester fabrics that resist sagging and fading. The pleats keep their crisp folds far longer than cheaper shades, and cordless mechanisms have fewer parts to wear out. With gentle regular cleaning and careful operation, a good set of cellular shades commonly lasts a decade or more, making their higher price and energy savings a sound long-term investment for the home.
Single Cell vs Double Cell: When Each Wins
Single cell shades use one row of honeycomb pockets and cost a bit less, making them a fine choice for mild interior windows or budget-driven projects. Double cell shades add a second row of air pockets, delivering higher R-values and better sound dampening, which pays off on large, sun-exposed, or drafty windows and in bedrooms. The double cell’s extra thickness also stacks slightly more when raised. For most homeowners prioritizing comfort and energy savings, the modest upcharge for double cell is well worth it.
Custom Sizing and Special Shapes
Cellular shades adapt to unusual windows better than many treatments. Custom orders cover arched tops, angled skylights, and specialty shapes, and skylight-specific cellular shades run on tracks to hold position on sloped glass. Precise measuring is essential for these made-to-order pieces, so professional measuring is wise for anything non-standard. Getting the fit right ensures the shade seals edge gaps and delivers the full insulating and light-control benefits, especially important on hard-to-reach skylights where performance matters most.
Final Thoughts
Double cell cellular shades are the smart choice when energy efficiency tops your list, using two layers of honeycomb air pockets to deliver R-values well above single cell designs. Match the fabric opacity to each room, choose a safe cordless or motorized lift, and you will enjoy comfortable, quiet, and lower-cost rooms all year long.
