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Stop Drafts From Stealing Your Cash
The complete door & window sealing system that kills drafts, cuts energy waste, and pays for itself in one month. Everything you need. One box. One afternoon.
Indoor INSUL8 Kit
Your Home Is Bleeding Money Through Every Gap
Hold a tissue near your window frame. If it moves, you're paying to heat the outside. The average home loses 25-30% of its heating and cooling through air leaks around doors and windows.
Invisible Drafts
Cold air pours through gaps around windows, doors, and frames — gaps you can't even see but can definitely feel when the energy bill arrives.
Money Out the Window
Those tiny gaps add up. A 1/8" crack around a standard door frame lets in as much cold air as leaving a window half open. Your furnace runs overtime.
Cold Rooms, Hot Rooms
Some rooms are freezing while others are fine. The thermostat war never ends. The real problem isn't your HVAC — it's where the air is getting in.
See The Difference a $50 Kit Makes
Thermal imaging doesn't lie. Unsealed windows and doors show up as bright blue cold zones — pouring your heated air straight outside. After sealing with INSUL8, those cold zones disappear.
Everything You Need. One Box. Zero Guesswork.
Other brands sell you one piece of the puzzle. INSUL8 is the complete sealing system — weatherstrip seals, window film, draft tape, and video guides — in a single kit.
Premium Silicone Weatherstrip
100% silicone rubber that stays flexible from -40°F to 140°F. Seals door tops, sides, and window frames. Outlasts foam 3-5x because it has permanent shape memory — won't compress flat.
Crystal Clear Window Film
Optically clear insulation film that creates a dead-air barrier over your windows — the same principle as double-pane glass. Punch-free, easy to install, nearly invisible once applied.
Self-Adhesive Draft Tape
49 feet of waterproof, self-adhesive tape (3 rolls). Seals window edges, door bottoms, casings, and any gap or crack. Cuts to any size with scissors. Clean removal, no residue.
We Didn't Just Give You the Products.
We Gave You the Playbook.
Draft Detective Guide (PDF)
Room-by-room checklist to find every hidden draft in your home. Most people miss 60% of their air leaks. This guide finds them all.
Energy Savings Calculator
Enter your home details and see your projected savings. Shows exactly how fast your INSUL8 kit pays for itself based on your climate zone.
Video Tutorial Series
Step-by-step installation videos for every component. Scan the QR code on your box and watch before you start. No guessing, no mistakes.
Priority Text Support (30 Days)
Stuck mid-install? Text us a photo and get help in minutes, not days. Real humans who've done this a thousand times.
Here's What You're Getting Today
30-day satisfaction guarantee · Free shipping · Instant video access
More Windows? More Doors? We've Got You.
Enter Your Home Details. Get Your Answer.
No more guessing. Enter how many windows and doors you're sealing and we'll tell you exactly which kit to grab.
Saturday Morning to Saturday Lunch. That's It.
No contractor. No special tools. No experience needed. Just follow the steps.
Scan & Watch
Scan the QR code on your box. Watch the 3-minute setup video for your first component.
Seal Your Doors
Peel, press, and apply the silicone weatherstrip along door tops and sides. Clean surface first.
Film Your Windows
Apply the crystal clear film over window frames. Use a hair dryer to shrink tight. Barely visible.
Tape the Gaps
Run draft tape along any remaining gaps — casings, baseboards, sliding door tracks, vents.
INSUL8 vs. What You've Been Using
What BEEST Customers Are Saying
"Our living room used to be freezing no matter what. Applied the weatherstrip and window film on a Saturday morning — the difference was immediate. No more cold drafts by the couch."
"I was skeptical about the window film being invisible. You literally cannot tell it's there unless you touch the glass. And the draft near our back door? Gone."
"The silicone strips are way better than the foam crap from Home Depot that flattens out after a month. These actually hold their shape. And the QR video made it foolproof."
Everything You Need to Know
No. The film attaches with a light adhesive that removes cleanly — no residue, no marks, no damage to frames or glass. It's designed to be applied seasonally and removed without any trace.
The film is optically clear. Once applied and shrunk with a hair dryer, it's nearly invisible. You might notice it if you look closely at an angle, but from normal viewing distance, your windows look exactly the same.
Foam tape compresses flat within weeks and loses its seal. Our 100% silicone rubber has permanent shape memory — it bounces back every time the door closes. It works from -40°F to 140°F and lasts 3-5 years vs. one season for foam.
The 1-Pack Kit covers approximately 5 standard windows and 2-3 doors. For larger homes, grab the 2-Pack (10 windows, 4-6 doors) or 3-Pack (15 windows, 6-8 doors). Use the calculator above if you're unsure.
Just scissors and a hair dryer (for the window film). That's it. No special tools, no construction experience. The QR-linked video tutorials walk you through every step. Most people finish their entire home in 2-3 hours.
We offer a 30-day satisfaction guarantee. If you're not happy with the results, contact us for a full refund. We also have priority text support to help you get the best possible installation — we'd rather help you succeed than process a return.
Stop Heating the Outdoors. Start Today.
Every day you wait is another day you're paying for air that leaks right out. One kit. One afternoon. Warmer home tonight.
Next Level
Bigger gaps? Rim joists? Attic leaks?
The INSUL8 Kit handles doors and windows. For the heavy stuff — basements, crawl spaces, rim joists, attics — check out the BEEST Spray Foam Insulation Kit. The all-in-one system trusted by 10,000+ DIYers.
Explore BEEST Spray Foam Kits →Wait — Don't Leave Cold
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