Bottom-up cellular shades let you raise the shade from the bottom, while top-down/bottom-up (TDBU) models also lower it from the top for flexible light and privacy control. These five options include blackout styles, cordless operation, and a no-drill design. SUNFREE’s 34-by-64-inch model is best for buyers seeking blackout features in a larger window size; Allesin offers detailed sizing guidance; and LazBlinds is the standout option for tool-free installation. Check the listed width and height against your window before choosing.
| Product | Best For | Notable Feature |
|---|---|---|
| SUNFREE 34″ x 64″ | Blackout needs | Cordless TDBU adjustment |
| Allesin 27″ x 64″ | Precise light and privacy control | Mounting measurement instructions |
| LazBlinds 34″ x 64″ | Tool-free installation | No-drill mounting design |
| MYshade 19″ x 36″ | Smaller windows | Blackout honeycomb shade |
| SUNFREE 22″ x 36″ | Compact blackout coverage | Cordless operation |
SUNFREE 34-Inch Blackout Cellular Shade
This SUNFREE shade measures 34 inches wide by 64 inches high and combines cordless TDBU adjustment with a blackout honeycomb design. The shade can be moved from the top or bottom and stopped in different positions, giving users options for admitting daylight while limiting sightlines.
Best for: Buyers looking for a larger, listed-size shade with blackout and insulation features. Its honeycomb structure is described as helping reduce noise and heat transfer, and the product information states that its fabric blocks light and UV rays.
Limitation: The listed dimensions are specific; confirm they suit your window and mounting plan. The blackout and insulation descriptions are manufacturer-provided features, not a guarantee of a fully sealed fit around the edges.
Allesin 27-Inch Cordless TDBU Shade
Allesin’s 27-by-64-inch shade uses a 1.5-inch cellular structure and a silver-plated inner layer. The TDBU cordless design allows adjustment from either end, which helps balance daylight and privacy. Its listing also provides distinct measuring guidance for inside and outside mounts.
Best for: Buyers who want clear sizing directions and adjustable coverage. For an inside mount, the listing calls for at least 2 inches of frame depth and recommends ordering a width 0.2 inches smaller than the measured window width. For an outside mount, it recommends adding 4 to 6 inches to the window dimensions.
Limitation: The blackout effect may require a separately sold light-blocking strip, according to the product information. Measure carefully and follow the instructions for the selected mounting style.
LazBlinds No-Drill TDBU Shade
This LazBlinds model is listed for a 34-by-64-inch window and uses a tool-free installation design. The product information says the spring rod adjusts by up to 1 inch and fits widths from 33.7 to 34.6 inches. Its magnetic top rail supports TDBU positioning, while a stopper helps keep the bottom rail stable.
Best for: Renters or other buyers seeking a no-drill option. The listing says installation requires no screws, brackets, or drilling, and describes the shade as cordless and suitable for homes with children or pets.
Limitation: The stated fit range is narrow, so measure the window carefully. The listing names several surfaces it can hold on, but buyers should confirm their surface and window configuration are appropriate before installation.
MYshade Blackout Shade For Small Windows
MYshade’s black cellular shade measures 19 inches wide by 36 inches high and is described as a 1.5-inch cordless blackout honeycomb blind. The listing emphasizes light control and privacy, along with materials intended to resist flaking, cracking, and fading during extended use.
Best for: Buyers shopping for a compact window who want a dark-colored blackout option. The product description identifies home, bedroom, kitchen, and office use, and says the TDBU design can help manage incoming light and privacy.
Limitation: This product’s listed size is substantially smaller than the 34-by-64-inch options. Confirm both dimensions before purchasing; the supplied features do not specify detailed mounting measurements.
SUNFREE 22-Inch Cordless Cellular Shade
This 22-by-36-inch SUNFREE model offers cordless TDBU adjustment in a compact size. Its hexagonal honeycomb construction and aluminum-foil layer are described as blocking light, reducing noise, and helping limit heat transfer. The shade can be raised or lowered and stopped in position.
Best for: Buyers who need a smaller SUNFREE shade with adjustable light and privacy control. It is a more suitable size to consider than the 34-by-64-inch version when the window opening is closer to 22 by 36 inches.
Limitation: The listed dimensions must match the window and mounting method. The product description makes blackout and insulation claims, but does not provide a separate measured blackout rating.
Buying Guide: How To Choose Bottom-Up Cellular Shades
Do you need top-down/bottom-up operation?
A TDBU shade can open from the bottom, the top, or both directions, depending on its design. This gives more placement choices than a shade that only lifts from the bottom. Consider whether you want daylight from above while keeping the lower part of the window covered. All five featured products are described as TDBU shades.
How should you measure the window?
Compare the product’s listed width and height with your window and determine whether you will use an inside or outside mount. An inside mount sits within the frame and may require sufficient depth. An outside mount covers beyond the frame; Allesin’s listing recommends adding 4 to 6 inches to the window dimensions. Follow the specific product’s instructions rather than applying one measurement rule to every shade.
Is blackout or light filtering more important?
Choose a product described as blackout if reducing incoming light is a priority. SUNFREE and MYshade explicitly describe blackout features, while Allesin notes that an additional light-blocking strip may improve blackout performance. Product claims do not establish that every installation will eliminate light around the edges.
Should you choose cordless or no-drill?
Cordless controls avoid pull cords and let the shade be adjusted by hand. LazBlinds adds a no-drill installation approach, which may suit buyers who want to avoid screws or brackets. Check the listed fit range and installation surface before selecting it.
Frequently Asked Questions
What does top-down/bottom-up mean?
It describes a shade that can be adjusted from the top and the bottom, allowing different parts of the window to remain covered or open.
Are cellular shades blackout?
Some models are described as blackout, including the SUNFREE and MYshade options here. Light may still enter around the shade’s edges depending on fit and installation.
Which option is designed for no-drill installation?
The LazBlinds shade is described as installing without screws, brackets, or drilling. Its listed fit range is 33.7 to 34.6 inches wide.
Do all five shades fit the same window?
No. Their listed sizes range from 19 by 36 inches to 34 by 64 inches. Match a shade’s width and height to your window and mounting requirements.
Can cellular shades help with insulation?
The featured products describe their honeycomb structures as helping reduce heat transfer. The degree of insulation depends on the shade and its fit; the supplied product details do not provide comparative test measurements.