Skip to main content

21OAK may earn a commission when you buy through links on our site.

An honest review of the ChiliSleep OOLER Sleep System

Can a mattress pad provide luxurious — and cool — sleep?

That’s what ChiliSleep claims its new OOLER Sleep System can deliver. The hydro-powered thermal pad is designed to keep you cool at night by circulating water through a pad placed between your mattress and fitted sheet with the goal of keeping hot sleepers cool, and cold sleepers warm. A control unit sends the water back and forth between it and the pad, sending it out at a temperature you specify (55-100 degrees Fahrenheit). The unit can be operated manually or through a Bluetooth phone app.

Through all this, ChiliSleep guarantees a long, restful night’s sleep and a comfortable bed to boot. I set out to see if the OOLER system was really an all-around winner.


  • Easy to unbox and set up
  • Bluetooth controllable
  • Wide temperature range
  • 30-night trial period
  • Two-year warranty


  • Design not optimized for all bed and bedroom styles
  • Warm Awake feature not always reliable
  • Sound it emits can be bothersome

Unboxing and setup

The OOLER Sleep System arrived in a box perfectly designed to securely fit the control unit — an oval-shaped water reservoir with flat white buttons — and all the necessary coiled cables and wires. The half queen-sized mattress topper fit perfectly on my mattress, though the attached fabric loops meant to help keep it in place weren’t the perfect size to fit snugly around my mattress. Once I put my fitted sheet back on the bed, I couldn’t even tell the OOLER pad was there. The hoses connected to the OOLER system are a bit too bulky to hide but are easily long enough to allow you to conceal them and the water tank almost anywhere.

The OOLER system’s patented cooling and warming water technology requires about 32 oz. of distilled water to work its magic. After pouring the water in the tank and pairing the OOLER system with the iOS app, it was ready to go.

While the OOLER’s tank isn’t large, the space requirements can be limiting. It requires about 6 inches around it on all sides to allow for proper venting. I own a platform bed without under-bed storage, so there was nowhere to put the unit and the hoses except beside the bed, which wasn’t the most ideal storage solution.

Image used with permission by copyright holder


Initial impressions of the ChiliSleep OOLER Sleep System

It was incredibly refreshing to lie down in bed and not immediately break into a sweat. Using the app, which connected to my OOLER system via Bluetooth, I was able to pre-cool the bed so it was at the perfect temperature for me. I also rejoiced in knowing the OOLER system has a temperature range from 55 to 100 degrees Fahrenheit — if by some miracle, I ever got too cold while sleeping, I now had a way to warm up.

The app offered a Warm Awake feature, which would prompt the mattress to start warming up about 30 minutes before a scheduled wakeup time — allegedly a more natural way to wake up than to a buzzing alarm.

I wasn’t expecting much other than a more comfortable falling-asleep process, but the OOLER app’s programmable sleep schedule ensured that I not only fell asleep quickly but stayed asleep until it was time to wake up. I awoke after that first night feeling surprisingly refreshed. Would this trend continue? I was anxious to find out.

After three weeks of use

I’m not going to lie, the idea of water circulating around something sitting directly atop my mattress didn’t exactly fill me with ease; I tend to be an active sleeper and worried that I would disrupt something and cause a leak, but that never came to pass. The washable mattress pad cover came in handy. Yes, I ate soup in my bed and spilled. Don’t judge me.

The Warm Awake feature offered through the app produced less-than-reliable results; the shift in temperature wasn’t quite enough to rouse me, though thankfully I had set an alarm as a backup just in case. While it’s a good thing the OOLER system lulled me into a deep sleep, it was equally good to know that the system might not be able to rouse me in quite the same fashion.

What users say

The ChiliSleep website shows the OOLER Sleep System has a 4.2/5-star rating with over 800 reviews (830 at the time of publication). Here’s the breakdown:

  • 543 five-star reviews (65%)
  • 115 four-star reviews (14%)
  • 36 three-star reviews (4%)
  • 39 two-star reviews (5%)
  • 97 one-star reviews (12%)

Overall, Amazon reviewers were wowed by the OOLER Sleep System, praising it for alleviating hot flashes and night sweats all year round. Most of the reviews under 3 stars appeared to be more about user error than the system’s functionality. Here’s the breakdown of their 242 reviews:

  • 87 five-star reviews (56%)
  • 25 four-star reviews (11%)
  • 23 three-star reviews (7%)
  • 23 two-star reviews (7%)
  • 84 one-star reviews (19%)

What others say

SleepGadgets mentioned the sound the OOLER unit makes  even on silent mode  could be disruptive to light sleepers or to those who sleep in an echo-y bedroom or don’t like white noise. GQ praised the OOLER sleep system for its remarkable cooling technology, which made a summer in New York City feel bearable.

Final thoughts

For me, the OOLER system delivered on its promise to provide a long, restful night’s sleep. The ability to automate the mat’s temperature to a comfortable range, and the capability to keep both cold- and warm-blooded sleepers comfortable has easily made it something I can’t imagine sleeping without. At $699 for the half queen size, the ChiliSleep OOLER Sleep System should make anyone’s list of must-try sleep solutions.

Editors' Recommendations

Amanda Lien
Former Digital Trends Contributor
What a hardwood contractor says your wood flooring says about you
According to a hardwood contractor, the species, stain, and cut of your wood floors can say a lot about you
bleached light wood flooring in an entryway

The home is a canvas for your personality, and your interiors should reflect your personal aesthetics. A professional hardwood contractor on TikTok, @lumberjackwoodsupply, says your wood flooring may reveal more about you than you might have thought. Here is what the species, color, and style of your wood flooring say about you (though, of course, some of these are a bit tongue-in-cheek).
What your wood flooring species says about you
If you have lighter, slim, natural pine floors, this TikToker says you likely fall into one of two categories. “You definitely have an appreciation for old things,” says @lumberjackwoodsupply. Alternatively, “you most likely own an old house that had these floors underneath.”
Walnut flooring
Walnut flooring is classy, elegant, and often sold at a steeper price. The hardwood contractor says homeowners with walnut flooring “have taste.”
Red oak
“There’s a good chance you didn’t choose to install this. It was just already in your house,” says this TikToker. But if you did choose to install red oak flooring, “you are either on a budget or you like to go against the status quo.”
Brazilian Cherry
“You probably live in an upscale but slightly outdated suburban home,” says the hardwood contractor. “There’s a good chance you hate the red.”
If you favor the sleek light wood tones of maple flooring to curate an airy and uplifting aesthetic, “You either live on the beach, or you want to look like you live on the beach,” says this TikToker.
Hickory flooring is well-known for its boldness. It’s a unique wood with a quirky grain and various hues. If you have hickory flooring, “you like unique things,” says the hardwood contractor. “You want to be different.”

Read more
Want a luxe living room or bedroom? Upgrade your TV wall with an IKEA fave and this easy DIY project
Use this IKEA TV stand idea from TikTok to upgrade your entertainment center
Luxury beige wall living room, modern flat television on brown wood panel wall, gray leather sofa, mid century style shelf in sunlight from window white sheer curtain for interior design background 3D


There are several living room trends that aim to add a luxe touch to our interiors, especially when it comes to dressing up the TV and TV stand. TVs can be a bit of an eyesore in the home, especially in modern designs that beg for more simplicity and elegance. While there are several fantastic trends like the picture frame TV or the classic built-in consoles that hide the TV behind a cabinet door, this idea from TikTok helps dress up the space without draining your wallet.

Read more
What color light helps you sleep? Here’s why you should invest in some red lights for your bedroom
How to choose the right color lighting for the best night's sleep
Red light in bedroom

Color psychology tells us many things about how we're influenced by what we see. Culture aside, most colors trigger similar psychological reactions in people. Some colors agitate or excite while others calm and pacify, putting you in a relaxed mindset. So, what color helps you sleep?

You can use light colors in several ways, from helping you design a room or aesthetic to altering the ambiance in the space, depending on your mood. For example, even if you don't choose a specific light color, certain bulbs like incandescents or fluorescents have their own warm or cold light. These dramatically change the way a room feels.

Read more