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Windows are one of the main places a room gains heat in summer and loses it in winter, and a heavy curtain adds a layer of fabric and trapped air between the glass and the room. If you searched for the best blackout curtains thermal performance can justify, focus on fabric density, a liner if you want full darkness, and a hanging style that lets the curtain sit close to the window.
We compared eight thermal insulated curtains on construction, the light-blocking range each brand claims, panel size, header style and care, following our editorial policy. For general picks, see our guide to the best blackout curtains.
Our Top 3 Thermal Blackout Curtains
Eclipse Kendall Thermaback Blackout Curtain
- Thermaback backing blocks 98%-99.9% of light per brand
- Rod pocket sits close to the window
- Machine washable
Joydeco 100% Blackout Linen Look Thermal Curtains
- Dedicated liner blocks 100% of light per brand
- Heavyweight faux linen texture
- Rod pocket or back-tab hanging
BGment Navy Thermal Curtains with Back Tabs
- Three ways to hang: back tabs, rod pocket or rings
- Blocks 90%-99% of sunlight per brand
- Machine washable
Thermal Blackout Curtain Comparison Table
| Product | Best For | Construction | Panel size | Header | |
|---|---|---|---|---|---|
 Eclipse Kendall Thermaback Blackout Curtain | Best Overall | Thermaback backing | 42″ x 63″ (1 panel) | Rod pocket | View |
 Joydeco 100% Blackout Linen Look Thermal Curtains | Best Lined Linen Look | Faux linen with dedicated liner | 52″ x 84″ (pair) | Rod pocket and back tabs | View |
 BGment Navy Thermal Curtains with Back Tabs | Best Hanging Options | Heavy-duty thermal fabric | 42″ x 63″ (pair) | Back tab, rod pocket or clip rings | View |
 NICETOWN Thermal Insulated Blackout Curtains 84″ | Best Floor Length | Heavy triple weave | 52″ x 84″ (pair) | Grommets | View |
 LEMOMO Thermal Insulated Blackout Curtains | Best Value Triple Weave | Triple weave | 52″ x 84″ (pair) | 8 grommets | View |
 ChrisDowa Charcoal Thermal Blackout Curtains | Best Same Color Both Sides | Thick solid fabric | 42″ x 63″ (pair) | 6 grommets | View |
 Deconovo Black Thermal Blackout Curtains 84″ | Best Soft Drape | Thermal insulated fabric | 52″ x 84″ (pair) | Grommets | View |
 H.VERSAILTEX Ivory Thermal Room Darkening Curtains | Best Light Color | Thermal specialty yarn | 42″ x 63″ (pair) | 6 grommets | View |
Eclipse Kendall Thermaback Blackout Curtain
- Thermaback backing adds an insulating layer
- Blocks 98%-99.9% of sunlight per brand
- Rod pocket header reduces gaps at the top
- Machine wash cold, gentle
- Modern solid black
- Sold as a single panel
- Rod pocket is slower to open and close than grommets
- 63″ length for shorter windows
| Panel size | 42″ W x 63″ L (single panel) |
|---|---|
| Material | Polyester with Thermaback backing |
| Header | Rod pocket |
| Light blocking | 98%-99.9% per brand |
| Care | Machine wash cold, gentle; no bleach; warm iron; line dry low |
Eclipse’s Thermaback technology is a dedicated backing layer designed for light blocking and thermal benefits, and the Kendall panel is our top pick for insulation. Eclipse says it blocks 98% to 99.9% of sunlight and creates an insulated barrier against summer heat and winter cold.
The rod pocket header slides over the rod so the curtain hangs closer to the wall and window, which leaves fewer gaps for air and light at the top. It is machine washable on a gentle, cold cycle.
Who the Eclipse Kendall fits best
Drafty bedrooms and living rooms, and any window where you rarely open the curtains.
Who should skip the Eclipse Kendall
Windows you open and close several times a day.
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Joydeco 100% Blackout Linen Look Thermal Curtains
- Dedicated liner for full darkness in a light color
- Dense weave traps air for insulation
- Two hanging options: rod pocket or back tabs
- Heavyweight faux linen texture
- Machine washable
- Back tabs need a little more effort to slide
- Heavier fabric needs a sturdy rod
| Panel size | 52″ W x 84″ L each, set of 2 |
|---|---|
| Material | Faux linen with blackout liner |
| Header | Rod pocket and back tabs |
| Light blocking | 100% per brand |
Joydeco’s linen-look curtains add a dedicated liner behind a heavyweight faux linen face, so you get the insulation of a dense, layered curtain and full darkness without using a dark color. Joydeco says the liner blocks 100% of sunlight and UV.
The panels can hang by rod pocket or back tabs; back tabs create neat, tailored folds. The dense weave traps air to help keep heat and cold out.
Who the Joydeco Linen fits best
Bedrooms and living rooms that want a natural linen look plus insulation.
Who should skip the Joydeco Linen
Anyone wanting a light, airy drape.
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BGment Navy Thermal Curtains with Back Tabs
- Back tabs, 3″ rod pocket or your own clip rings
- Blocks 90%-99% of light per brand (darker colors best)
- Thermal insulation against heat and chill
- Machine wash cold, gentle
- 63″ length
- Navy is the darkest option, lighter colors block less
| Panel size | 42″ W x 63″ L each, set of 2 |
|---|---|
| Header | 6 back tabs and 3″ rod pocket |
| Light blocking | 90%-99% per brand |
| Weight | 1.9 lbs (pair) |
| Care | Machine wash cold, gentle; tumble dry low |
BGment’s navy curtains give you three hanging options: back tabs for tailored folds, a 3-inch rod pocket for a snug top edge, or your own clip rings. That flexibility helps you get the curtain close to the window for better insulation.
BGment says they block 90% to 99% of sunlight, with darker colors working better, and insulate against summer heat and winter chill. They are machine washable in cold water.
Who the BGment Back Tab fits best
Smaller windows where you want to fine-tune how the curtain hangs.
Who should skip the BGment Back Tab
Floor-length looks on tall windows.
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NICETOWN Thermal Insulated Blackout Curtains 84″
- Heavy, soft fabric
- 85%-99% light blocking per brand
- Thermal insulated and energy efficient per brand
- Machine wash below 86°F
- Unlined, so lighter colors block less
- Grommets leave small gaps at the top
| Panel size | 52″ W x 84″ L each, set of 2 |
|---|---|
| Hanging | Silver grommets, 1.6″ inner diameter |
| Light blocking | 85%-99% per brand |
| Care | Machine wash below 86°F, mild detergent; low iron |
NICETOWN’s 84-inch black curtains are heavy, soft triple-weave panels that the brand says block 85% to 99% of light and help with heating and cooling. The longer length covers more of the wall below the window, which helps reduce drafts.
They are machine washable below 86°F.
Who the NICETOWN 84″ fits best
Living rooms and bedrooms with standard windows and floor-length curtains.
Who should skip the NICETOWN 84″
Anyone who wants a light color with full blackout.
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LEMOMO Thermal Insulated Blackout Curtains
- Triple-weave thermal fabric
- 85%-99% light blocking per brand
- No chemical smell per listing
- Machine washable
- Unlined
- Lighter weight at 1.58 kg per pair
| Panel size | 52″ W x 84″ L each, set of 2 |
|---|---|
| Material | 100% polyester triple weave |
| Hanging | 8 silver grommets, 1.6″ inner diameter |
| Weight | 1.58 kg (pair) |
LEMOMO’s black curtains use a triple-weave polyester fabric for insulation and light blocking, which the brand puts at 85% to 99% with darker colors performing best. The fabric is smooth and soft.
They are machine washable and slide on most standard rods.
Who the LEMOMO fits best
Budget-conscious buyers who want simple thermal curtains.
Who should skip the LEMOMO
Anyone who needs full darkness in a pale color.
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ChrisDowa Charcoal Thermal Blackout Curtains
- Blocks 98% of sunlight per brand
- Same color on both sides
- Machine wash below 86°F, tumble dry low
- No chemical smell per listing
- 63″ length
- Charcoal shows lint
| Panel size | 42″ W x 63″ L each, set of 2 |
|---|---|
| Light blocking | 98% per brand |
| Hanging | 6 grommets, 1.6″ inner diameter |
| Care | Machine wash below 86°F, gentle; tumble dry low |
ChrisDowa’s charcoal curtains are the same color on both sides, so they look finished from outside. The brand says they block 98% of sunlight and help reduce heat and cold loss through the window.
They are machine washable and can be tumbled dry on low.
Who the ChrisDowa Charcoal fits best
Front-facing windows where the outside look matters.
Who should skip the ChrisDowa Charcoal
Floor-length installations.
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Deconovo Black Thermal Blackout Curtains 84″
- Soft, substantial fabric falls in natural folds
- Thermal fabric layer at the window
- Machine wash cold, gentle
- 52″ x 84″ panels
- No light-blocking percentage listed
- Unlined
| Panel size | 52″ W x 84″ L each, set of 2 |
|---|---|
| Material | Polyester |
| Care | Machine wash cold, gentle, mild detergent; low iron |
Deconovo’s black 84-inch curtains focus on a soft drape and a thermal fabric layer. They reduce sunlight and glare for naps and night-shift rest and add privacy.
Care is simple: machine wash cold on gentle and use a low iron for packing creases.
Who the Deconovo Black fits best
Living rooms and bedrooms that want a soft, flowing look with insulation.
Who should skip the Deconovo Black
Anyone who needs a specific light-blocking rating.
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H.VERSAILTEX Ivory Thermal Room Darkening Curtains
- Ivory cream keeps rooms bright
- Blocks 70% of sunlight and 100% of UV per listing
- Global Recycled Standard certified per listing
- Machine wash cold
- Room darkening, not full blackout
- 63″ length
| Panel size | 42″ W x 63″ L each, set of 2 |
|---|---|
| Light blocking | 70% sunlight, 100% UV per listing |
| Hanging | 6 metal grommets |
| Care | Machine wash cold; non-chlorine bleach only |
Not every room needs darkness. H.VERSAILTEX’s ivory thermal curtains let some light through while adding an insulating layer, which suits living rooms and offices. The listing says they block 70% of sunlight and 100% of UV.
They carry a Global Recycled Standard certificate per the listing and are machine washable in cold water.
Who the H.VERSAILTEX Ivory fits best
Living rooms and home offices that want insulation without a dark room.
Who should skip the H.VERSAILTEX Ivory
Bedrooms and media rooms that need blackout.
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How to Choose Thermal Blackout Curtains
Look for density and layers
Thicker, heavier curtains and curtains with a backing or liner trap more air, which slows heat moving between the window and the room.
| Construction | Insulation | Light blocking |
|---|---|---|
| Single-layer room darkening | Some | Partial |
| Triple weave | Good | Most light in dark colors |
| Backing or liner | Best | Nearly all light |
Hang curtains close to the window
Rod pockets and back tabs keep fabric close to the wall. A wraparound rod or a cornice at the top reduces the air that circulates behind the curtain.
Go wide and long
Extend the rod past the frame on both sides and choose floor-length panels to cover more of the cold wall area around the window.
Open and close with the sun
In summer, keep sun-facing curtains closed during the day. In winter, open them on sunny days for warmth and close them at night to hold heat in.
Check the care instructions
Most thermal curtains are machine washable in cold water. Avoid high heat in the dryer to protect backings and liners.
Frequently Asked Questions
Do thermal curtains really work?
They add an insulating layer at the window, which helps slow heat gain in summer and heat loss in winter. Results depend on the window, the fit and how you use them.
Are thermal curtains the same as blackout curtains?
Not always. Many blackout curtains are also thermal because they are dense, but some thermal curtains are only room darkening.
What color thermal curtains are best?
Lighter colors on the window side reflect more summer sun, while dark colors block more light. A liner or backing gives the best of both.
Should thermal curtains touch the floor?
Floor-length curtains cover more of the window wall and reduce drafts, so they usually insulate better.
Final Verdict
For most windows, the Eclipse Kendall Thermaback Blackout Curtain is the best thermal blackout curtain thanks to its insulating backing and snug rod pocket header. Choose the Joydeco Linen Look for a lined curtain in a light color, or the BGment Back Tab curtains for flexible hanging.
Looking for something else? See bedroom-specific picks in our best blackout curtains for bedroom guide.
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