AIRCAP HOT TUB COVER: THE SHORT ANSWER
Yes — for most square hot tubs, the AIRCAP hot tub cover by Thrml is worth it. At $1,195, it costs only a few hundred dollars more than a traditional vinyl-and-foam cover, but it is built completely differently. There is no foam core to soak up water, so it does not get heavy, sag, or lose insulation the way foam covers do. After 25 years in this industry, I have hauled more waterlogged 150-pound covers to the dump than I can count. The AIRCAP is the first cover I have seen that is built to avoid that problem. In my view the Aircap Spa cover is one of the longest lasting hot tub covers on the market today.
AIRCAP by Thrml
$1,195
Every size · Free shipping to all 50 states
Traditional Vinyl & Foam
$900–$1,000
Typical replacement cost · Foam absorbs water over time
EXCLUSIVE HOT TUB INSIDER DEAL
Save $125 + Free Shipping on Your AIRCAP
Use this code at checkout on thrmltech.com:
HTI_FWSG
Key Takeaways
- Price: $1,195 for every size, only a few hundred dollars more than a typical vinyl-and-foam replacement cover.
- No foam: The AIRCAP uses inflatable drop-stitch panels (the same idea as a high-end paddleboard), so it cannot get waterlogged.
- Lightweight for life: It weighs 35–40 lb out of the box, and it stays that weight years later.
- Torture-tested: Thrml has put it through arrow, bowling-ball, side-by-side, and full-size-truck tests. Watch the videos below.
- Low risk to try: 3-year limited warranty, free 30-day returns, and it ships in 1–2 business days.
What Is the AIRCAP Hot Tub Cover?
The AIRCAP is a foam-free hot tub cover made by Thrml. Instead of the foam core wrapped in vinyl that nearly every spa cover has used for decades, it is built with AirLoc drop-stitch construction: welded panels with thousands of internal threads that hold the inflated air core rigid and flat.
Why does that matter? A foam cover starts dying the day you put it on. Steam works its way into the foam, the cover gets heavier every season, the center starts to sag, and your heater works harder to make up for the lost insulation. The AIRCAP has no foam core to soak up water, so its weight and insulation stay the same for the life of the cover.
AIRCAP Hot Tub Cover Durability Tests: 5 Videos
Anyone can say their cover is “tough.” Thrml went ahead and filmed it. Here are the tests they have run on the AIRCAP.
TEST 1
The Bow & Arrow Test
Puncture resistance is the first question people ask about an air-filled cover. So Thrml shot it with an arrow.
TEST 2
The Full-Size Truck Test
This is the one that stops people in their tracks: a full-size pickup truck versus the AIRCAP.
TEST 3
The Side-by-Side (UTV) Test
A side-by-side is an off-road UTV, and it weighs well over a thousand pounds. Here is what happens when one rolls over an AIRCAP.
TEST 4
The Bowling Ball Test
Kids jump on covers, branches fall on them, snow piles up. A dropped bowling ball is a good stand-in for real-world impact.
TEST 5
The Sit & Stand Test
Can you actually sit or stand on it? Watch the clip on LinkedIn.
AIRCAP vs. a Traditional Vinyl & Foam Cover
| Feature | AIRCAP by Thrml | Traditional Vinyl & Foam |
|---|---|---|
| Price | $1,195 (every size) | Typically a few hundred dollars less |
| Core | Inflated drop-stitch air core | Foam panels wrapped in vinyl |
| Weight | 35–40 lb, and it stays that way | Heavy new, and heavier as the foam absorbs water |
| Waterlogging | No foam to absorb water | The most common reason covers fail |
| Insulation over time | Stays the same for the life of the cover | Drops as the foam gets wet |
| Skirt | ZipTech skirt, 3 depths included, replaceable on its own | Sewn on; replace the whole cover when it wears out |
| Returns | Free 30-day returns | Custom orders usually cannot be returned |
How Durable Is the AIRCAP Hot Tub Cover?
Durability is where the AIRCAP earns its price. Thrml says the cover resists punctures, tears, and UV, and the drop-stitch panels hold their shape under pressure season after season. The videos above back that up. Foam covers rarely fail all at once. They fail slowly as water creeps in. Taking the foam out takes away the main way covers fail.
Two smart design touches also help it last:
- Replaceable ZipTech skirts: The skirt is usually the first part of any cover to wear out. On the AIRCAP it zips off, so you replace the skirt, not the whole cover. Three skirt depths come in the box.
- Welded, sealed construction: The panels are welded rather than stitched, so there are no seams for water to wick through.
Real Owner Feedback
Here is what one dealer and their customers are saying about the AIRCAP:
“Setup took about 15 minutes.”
— Neil, AIRCAP owner (from thrmltech.com)
What to Know Before You Buy an AIRCAP Hot Tub Cover
- Square tubs only: The AIRCAP fits about 90% of square hot tubs. Sizes run from 77″ to 94″ measured across the top. Round and odd-shaped spas are not supported yet.
- Measure first: Use Thrml’s SureFit measuring guide or Spa Fitter lookup before you order.
- Cover lifters: It works with many manual cover lifters. Thrml offers a compatibility check on its site.
- Warranty: The AIRCAP comes with a 3-year limited warranty on manufacturing defects. Thrml does not publish an R-value, so compare it on build and longevity rather than a lab number.
My Verdict: Why You Should Buy the AIRCAP Hot Tub Cover
If you own a square hot tub and you are shopping for a replacement cover, yes, the AIRCAP is worth it. You are paying only a few hundred dollars more than a vinyl-and-foam cover. In return you get a cover that will not get waterlogged, stays light enough to lift by yourself, has survived arrows, bowling balls, and a pickup truck on camera, and comes with a replaceable skirt. Most foam covers I see need replacing every 3–5 years. Avoid replacing it even once, and the AIRCAP has paid for itself.
EXCLUSIVE HOT TUB INSIDER DEAL
Save $125 + Free Shipping on Your AIRCAP
Use this code at checkout on thrmltech.com:
HTI_FWSG
Frequently Asked Questions
How much does the AIRCAP hot tub cover cost?
$1,195 for every size, with free shipping to all 50 states.
How much does the AIRCAP weigh?
Between 35 and 40 lb depending on size, and it stays that weight because there is no foam to absorb water.
Will the AIRCAP fit my hot tub?
It fits about 90% of square hot tubs measuring 77″–94″ across the top. Check Thrml’s SureFit guide before ordering.
What if it does not work out?
Thrml offers free 30-day returns with a prepaid label and no restocking fee, as long as the cover is in like-new condition with all parts. Retailer purchases follow the retailer’s return policy.
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