Single vs Double Cell Cellular Shades: Which Insulates Better?
on Oct 28 2026
Quick Answer: Double cell cellular shades insulate better than single cell shades because they trap air in two layers of honeycomb pockets instead of one, giving a higher R-value. They are worth it for bedrooms, drafty or single-pane windows and rooms with very hot or very cold weather. Single cell shades cost less, stack slimmer and are the better fit for very large windows, sliding doors and shallow window frames.
Both styles use the same honeycomb structure, the same fabric choices and the same motorized lift options. The real differences are thermal performance, profile depth and price. Below we compare them with numbers where they exist, explain where each one makes sense, and map your needs to options from our motorized cellular shades collection.
What Are Double Cell Cellular Shades?
A single cell shade has one layer of hexagonal cells: one row of air pockets between the room and the glass. A double cell shade bonds two staggered layers of cells together, so air is trapped in two pockets in a row before heat reaches the window. Weffort's double cell shades use exactly this design, two stacked honeycomb layers that form double air pockets and increase thermal resistance compared with single cell construction.
Seen from the room, the two look almost the same. Double cell shades have a slightly fuller, more structured pleat and a deeper profile, and they hold their shape well across wide windows.
Double Cell vs Single Cell: Side-by-Side
| Factor | Single cell shades | Double cell shades |
|---|---|---|
| Construction | One layer of honeycomb pockets | Two layers of honeycomb pockets |
| Insulation value | Good | Better; higher R-value |
| Profile and stack | Slimmer; smaller stack when raised | Deeper; slightly larger stack |
| Light filtering | Brighter diffused light | Slightly softer light through two layers |
| Price | Lower | Higher |
| Best for | Large windows, sliding doors, mild climates, shallow frames | Bedrooms, nurseries, drafty glass, hot or cold climates |
R-values vary by fabric and manufacturer, so compare published ratings for the specific fabrics you are considering rather than assuming one number fits every shade.
R-Value and Energy Savings: How Big Is the Difference?
R-value measures resistance to heat flow; higher is better. A bare single-pane window has an R-value of roughly 1 and a typical double-pane window roughly 2, so any cellular shade adds meaningful resistance. Adding a second layer of cells adds more.
The U.S. Department of Energy's research gives a sense of scale. In tests run by Oak Ridge National Laboratory, cellular shades saved up to 20% on heating energy and up to 15% on total heating and cooling energy compared with a home with no shades. The DOE also notes that nearly 80% of U.S. homes still have inefficient single or double-pane windows, which makes well-fitted cellular shades an affordable alternative to replacement windows[1].
Manufacturers consistently position cell-within-a-cell designs as the higher-efficiency option, recommending them when you have many windows to cover or live with weather extremes. In practice, that means:
- Cold climates: double cell shades slow heat loss on winter nights and reduce the cold draft you feel near the glass.
- Hot climates: on west and south windows, two layers of air slow solar heat gain in summer.
- Mild climates: single cell shades already capture most of the benefit, and the savings from a second layer are smaller.
Fit and habits matter as much as construction. A shade with light gaps or one that stays open on a January night will not deliver its rated insulation. Automating when shades close is one of the easiest ways to turn insulation into lower energy bills; our guide to automated shades and energy efficiency covers timing by window orientation.
When Double Cell Shades Make a Big Difference
Bedrooms and nurseries
Bedrooms benefit twice: comfort near the window at night and better darkness. Our motorized double cell light filtering cellular shades suit rooms where you still want soft daylight, while the double cell blackout version blocks nearly all incoming light for sleep. The extra cell layer also adds some acoustic damping, which helps on street-facing bedrooms.
Drafty, older or single-pane windows
If you can feel cold air near a window in winter, a double cell shade inside the frame adds the most value. Choose an inside mount where the window frame is deep enough, so the shade sits close to the glass and traps a still layer of air.
Large sun-facing glass
Weffort's double cell light filtering shades are especially valuable on large, sun-facing windows and sliding glass doors where heat gain is the main problem. Diffused light still reaches the room, but less heat comes with it.
When Single Cell Shades Are the Smarter Choice
- Very large windows and doors where the stack matters: a single layer is lighter and stacks smaller, which keeps more of the view clear when the shade is raised.
- Shallow window frames: double cell shades are deeper. If the window opening is shallow, a single cell shade is more likely to fit an inside mount without the bottom rail sticking out.
- Mild climates and bright living areas: single cell light filtering shades let more daylight through and still insulate well.
- Budget across many windows: single cell costs less per window, so it can make sense to put double cell only in the coldest rooms.
Our Elegant Series motorized light filtering cellular shades are a single cell option in sheer, light filtering and blackout versions, and the Vintage Series offers single cell light filtering and blackout versions.
Light Filtering, Blackout and Privacy at Night
The number of cells does not decide opacity; the fabric does. A double cell light filtering shade is slightly dimmer than a single cell one, but it is not blackout. For darkness, choose a blackout fabric in either construction.
Privacy at night depends on fabric too. With lights on inside, light filtering shades can show shadows or silhouettes from outside, while blackout fabric does not. If you want daylight and full night privacy from one window, consider Weffort's Day & Night cellular shades, which combine light filtering and blackout fabric in one shade. For blackout rooms, also plan for edge light; our article on blackout roller shades with side tracks explains how side channels reduce light gaps.
Motorized Lift and Smart Control
All Weffort cellular shades are cordless and motorized, so there are no lift cords to pull or tangle, which keeps the clean look and removes a hazard for children and pets. You can raise and lower them by remote, wall switch, smartphone app or voice. They work with Apple HomeKit, Google Home, Amazon Alexa and SmartThings; see our smart home systems overview for setup options.
Motorization matters for insulation because a shade only helps when it is closed. A schedule that lowers shades at sunset in winter and during the hottest summer afternoons gets the most from either construction. Double cell is also available as top-down bottom-up in light filtering and blackout, which our top down bottom up cellular shades guide explains.
How to Choose: Single or Double Cell?
| Your situation | Recommended construction | Fabric |
|---|---|---|
| Cold bedroom or nursery | Double cell | Blackout |
| Hot west or south living room | Double cell | Light filtering |
| Wide patio door or picture window, view matters most | Single cell | Light filtering or sheer |
| Shallow window frame, inside mount | Single cell | Any |
| Street-facing room needing privacy and light | Single or double cell, top-down bottom-up | Light filtering |
Before you order, measure the depth of each window opening as well as its width and length, and check our cellular shade measuring guide for inside and outside mount dimensions. If you are also deciding on pleat size, read our cellular shade cell size guide.
Frequently Asked Questions
Are double cell cellular shades worth it?
Yes, for rooms where temperature is a problem: cold bedrooms, drafty or single-pane windows and hot sun-facing glass. In mild climates or on very large windows, single cell shades capture most of the benefit for less money and a smaller stack.
Do cellular shades provide insulation?
Yes. Their honeycomb cells trap air between the room and the glass. Department of Energy research found cellular shades saved up to 20% on heating energy compared with no shades[1].
Do cellular shades save energy in summer too?
They do. Closed during the hottest hours, cellular shades slow solar heat gain through the glass, which lowers cooling demand. Double cell construction adds a second barrier, which helps most on west and south windows.
Can people see through cellular shades at night?
With interior lights on, people may see shadows or silhouettes through sheer and light filtering fabrics. Blackout cellular shades, or a day and night shade with a blackout layer, prevent this.
What are the downsides of cellular shades?
Cells can collect dust and need occasional gentle cleaning, double cell shades need more frame depth, and blackout versions can show thin lines of light at the edges. They also cost more than basic blinds, although they insulate far better.
Not sure which construction suits your windows? Order free fabric samples to compare light and texture at home, then shop custom motorized cellular shades in single cell, double cell and top-down bottom-up styles.