Best Thermal Curtains to Keep Heat In UK

Looking for the best thermal curtains UK ? These top-rated picks help keep heat in and bills down.
Stop heat loss through windows and cut your heating bills with these top-rated thermal curtains.

As energy prices remain high across the UK, many households are looking for simple ways to stay warm without cranking up the thermostat. One of the most overlooked upgrades? Thermal curtains. These insulated panels help trap warmth inside, reduce draughts, and make rooms feel instantly cosier — especially in older homes with single glazing or poor insulation.

🧊 Before vs After: Living With & Without Thermal Curtains

After: With thermal curtains drawn, the room feels instantly cosier. Warm air stays put, draughts are blocked, and the temperature remains steady without the heating working overtime. Studies show they can reduce heat loss by up to 25% — but the real difference is how much more comfortable your home feels.

Before: You sit down in the evening and feel that familiar chill creeping in from the windows. The radiators are blasting, but the warmth disappears almost as quickly as it arrives. Cold draughts sneak through the frames, and you end up turning the thermostat higher just to feel comfortable.

Window insulation is one of the first steps in reducing heat loss, as explained in our how to heat your home room by room guide.

✍️ Author Insight

I used to think curtains were just about blocking light or adding a bit of style to a room. It wasn’t until one particularly draughty winter in my old flat that I realised how much warmth was slipping straight out through the windows. I remember pulling a pair of thermal curtains across for the first time and being surprised at how quickly the room felt different — less of that creeping chill, more of a steady, cosy warmth. It’s not glamorous, but it’s one of those small changes that makes everyday life better. Now, closing the curtains before sunset has become a little ritual for me, almost like drawing a line between the cold outside and the comfort inside. It’s simple, but it works.

🔥 Why Thermal Curtains Make a Big Difference

Thermal curtains aren’t just about blocking light — they’re a smart way to improve comfort and cut costs:

• 🛑 Blocks cold air from window gaps and draughts
• 🔥 Retains indoor heat so radiators don’t work as hard
• 💷 Lowers heating bills by reducing energy waste
• 🔇 Reduces outside noise for better sleep and focus
• 🌞 Blocks sunlight in summer to keep rooms cooler
• 🛏️ Improves sleep comfort with blackout and temperature control

🧾 Best Thermal Curtains UK (Amazon Top Rated)

🥇 YUHUILI Thermal Insulated Curtains – 146 x 170 cm

• Triple-weave blackout fabric blocks 70–99% of light
• Helps regulate room temperature year-round
• Wrinkle-resistant, machine washable, and easy to install

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🧵 Thermal Insulated Curtains – 180 x 220 cm (Grey)

• Triple-weave blackout fabric blocks 55–65% of light
• Designed to reduce cold drafts and retain warmth
• Soundproofing properties and elegant solid colour

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🌿 Flei Thermal Curtains – 300 x 260 cm

• Light-reflecting, fade-resistant material
• Retains warmth in winter and keeps rooms cool in summer
• Ultra-soft texture and elegant design

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🛏️ Modern Thermal Blackout Curtains – 220 x 250 cm

• Heavyweight fabric for maximum insulation
• Blocks light and helps reduce energy costs
• Ideal for bedrooms and living rooms

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🧊 JIAHAO Thermal Curtains – 80 x 75 cm

• Blocks 85–95% of sunlight and 98% of UV rays
• Safe for children and pets, free from chemical coatings
• Soundproof and energy-efficient design

🔗 View on Amazon

Lock In Heat, Block Out Cold

Thermal curtains work wonders alongside Heated Blankets and Reflective Radiator Foil Kits. For extra sealing, add Weather Stripping Tape to your windows and doors.

☕ The Little Ritual of Closing the Curtains

There’s something oddly satisfying about pulling the curtains shut as the evening sets in. It’s not just about privacy — it’s that moment when the room feels sealed off from the cold outside. With thermal curtains, that ritual becomes even more rewarding. You notice the warmth holding steady, the draughts disappearing, and the space feeling snug. It’s a small daily habit that makes winter nights more bearable, whether you’re settling in with a book, watching TV, or just enjoying a quiet cup of tea.

💡 Energy Tip of the Week

Close thermal curtains before sunset to trap daytime warmth. Pair with radiator foil and draught excluders for even better results.

🏛️ “Thermal curtains are a cost-effective way to reduce heat loss through windows, especially in older homes.” — Energy Saving Trust UK

✅ Final Recommendation

If you’re looking for maximum insulation and blackout performance, the YUHUILI Thermal Curtains offer excellent value and year-round comfort. For larger windows or a more decorative touch, the Flei Thermal Curtains combine style with substance.

Thermal curtains are one of the easiest ways to cut heating bills, reduce draughts, and make your home feel warmer — fast.

Stay warm for less this winter with the full Smart Heating & Home Warmth Hub explore smart thermostats, radiator valves, and insulation tricks that help cut UK energy bills fast.

Written by Andy M. — testing small upgrades that make UK homes warmer, cheaper, and easier to run.

Helpful reads if you’re tackling draughts and window heat loss:

Thermal curtains work best as part of a wider heat-retention setup — these articles help you compare options and fix the real causes of heat loss:

• Thermal blinds vs curtains: which actually keeps more heat in?
• Radiator foil vs thermal curtains — which upgrade works better?
• DIY fixes that stop heat escaping through windows
• Smart solutions for winter window condensation and damp