Best blackout cellular shades

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Single-cell shades have one row of air pockets; double-cell have two, stacked front to back. Double cell traps more air, so it insulates better and is a little more opaque, at a higher price and a slightly deeper stack when raised. For a bedroom that needs darkness, either works. For a cold room where insulation is the point, double cell is worth the difference.

The fit matters more than either. A cellular shade's insulating value assumes the cell pocket is sealed against the window; a half-inch gap at each side converts a good shade into an average one, and it is also where the light comes in. Measure the width at the top, middle and bottom of the recess and use the narrowest figure. Windows are rarely square, and this single step prevents the most common ordering mistake in the category.

If total darkness is the goal, look for shades with side channels — tracks fixed to the window jambs that the shade runs inside. They are the only way an inside-mounted shade closes the edge gap, and they turn a very good blackout shade into an effectively total one.

Cordless is the default now, for good reason

Every pick here is cordless. Corded lifts are a child-safety hazard and the industry has moved away from them; cordless mechanisms have also got much better, holding position reliably rather than creeping down over a day. If a cordless shade later refuses to stay up or come down, that is usually a fixable tension issue rather than a broken shade — see how to fix cordless blinds.

Top-down bottom-up, if privacy is also in play

The top-down bottom-up version lets you lower the shade from the top rather than raise it from the bottom, which covers the part of the window people can see through while leaving the daylight. In a blackout fabric it gives you a genuinely useful range: full privacy with light during the day, full darkness at night. It costs more and the mechanism is more to go wrong. Compared in top-down bottom-up vs standard shades.

Where cellular shades are the wrong answer

A window you want to see out of while it is covered. A kitchen window over a hob, where the fabric will take grease and cannot be washed. A very wide opening, where a single shade gets heavy and unwieldy and you are better off with two. And any window where you want directional light control — that is a blind's job, not a shade's. Blinds vs cellular shades has the full comparison.

Selection is on published cell construction, blackout fabric availability, cordless operation, and size range — specifically whether the product can be ordered to fit an awkward opening rather than only in stock widths. R-value figures quoted by manufacturers are comparative rather than absolute, and we treat them that way. We do not test these shades. Methodology.