We ran the Coolizi Cooling Ace for two full weeks in a 320 sq ft Brooklyn apartment during a 96°F heat wave. Here is exactly what happened — the good, the noisy, and the surprising.
Over 44 million U.S. households rent, and the majority of older apartments in cities like New York, Chicago, and Boston have no central air — and landlords who won't allow window units.
The math is brutal. A window AC install runs $300–$600 plus landlord approval. A portable unit with a hose kit blocks your only window and leaks hot air back in. Central air? Forget it — you don't own the place.
That leaves millions of renters choosing between a $400 electricity bill from running a clunky portable unit all day, or sweating through another 90°F+ afternoon. The Coolizi Cooling Ace was built specifically for this gap: a no-installation, hose-free evaporative cooler that plugs into any outlet and cools the air around you without modifying the apartment.
The Coolizi Cooling Ace is a compact, portable evaporative air cooler that uses a water-soaked honeycomb filter and a high-speed fan to lower the temperature of the air passing through it — no refrigerant, no compressor, no exhaust hose.
Unlike a traditional AC that recirculates and dehumidifies sealed air, Coolizi pulls in warm room air, passes it through a wet cooling pad, and pushes out air that can be 15–20°F cooler. It also adds moisture, which is a feature in dry climates (Arizona, Nevada, Texas) and a trade-off in humid ones (Florida, Gulf Coast).
Pour up to 750 mL of cold water (or ice) into the top reservoir. One fill lasts roughly 5–7 hours depending on fan speed and room humidity.
Connect the USB-C power cable to any standard outlet or power bank. No window kit, no hose, no drilling. Position it within 6 feet of where you sit.
Press the touch panel to select Cool, Fan, or Humidify mode, and pick from 3 fan speeds. The oscillating louver spreads cooled air across the room.
Everything we measured during the 14-day test, plus the manufacturer's official specs.
| Specification | Coolizi Cooling Ace |
|---|---|
| Cooling Technology | Evaporative (honeycomb filter + water) |
| Coverage Area | Up to 320 sq ft (personal cooling zone) |
| Temperature Drop | Up to 18–20°F in dry conditions |
| Water Tank Capacity | 750 mL |
| Runtime Per Fill | 5–7 hours (varies with humidity & speed) |
| Power Consumption | ~18W (USB-C powered) |
| Fan Speeds | 3 (Low / Medium / High) |
| Operating Modes | Cool · Fan · Humidify |
| Noise Level | 42 dB (Low) · 58 dB (High) |
| Weight | 2.9 lbs (empty) |
| Dimensions | 6.7 × 6.7 × 9.4 in |
| Oscillation | Automatic 90° louvers |
| Controls | Touch panel + remote |
| Installation | None — plug & play |
Enter your details below. We'll estimate your monthly cooling cost with Coolizi versus a typical 1,000W portable AC unit.
We placed the Coolizi Cooling Ace in a 320 sq ft Brooklyn bedroom and logged real conditions twice a day for two weeks.
Room started at 91°F with 38% humidity. Filled the tank with cold tap water, set to Cool mode, High fan. After 38 minutes the thermometer read 73°F directly in front of the unit. The rest of the room settled around 78°F. Impressive first impression.
Switched to Low fan for sleeping. Noise measured 42 dB from 6 feet away — quieter than a typical box fan. The room held at 72°F all night. Tank ran dry around hour 6, unit auto-switched to fan-only mode without waking anyone.
As expected with evaporative tech, performance dropped in higher humidity. Room went from 84°F to 78°F — a 6°F drop instead of the 18°F we saw on dry days. Still comfortable, but this is the honest ceiling in muggy weather.
Two weeks in, the unit has run roughly 90 hours total with zero issues. Filter still clean, no leaks, no odd smells. For a renter with no window AC option, this is the most practical $137.99 we've spent on cooling. Final score locked at 8.8/10.
Five categories, weighted toward real-world cooling performance and renter usability.
How the Cooling Ace stacks up against the two most common alternatives U.S. renters actually consider.
| Feature | Coolizi Cooling Ace | Window AC Unit | Portable AC (Hose) |
|---|---|---|---|
| Installation required | No | Yes (bracket) | Yes (window kit) |
| Exhaust hose | No | No | Yes |
| Renter-friendly | Yes | Often banned | Yes |
| Power draw | ~18W | 500–900W | 800–1,200W |
| Weight | 2.9 lbs | 40–60 lbs | 50–70 lbs |
| Best climate | Dry / moderate | Any | Any |
| Upfront cost | $137.99 | $250–$500 | $300–$600 |
| Monthly running cost* | ~$0.73 | ~$30 | ~$40 |
*Based on 8 hours/day, 30 days, $0.17/kWh. Your actual cost depends on local rates and usage.
Verified purchaser reviews collected from the official Coolizi store. Lightly edited for length, not for sentiment.
“I live in a third-floor walk-up in Chicago and my landlord flat-out refuses window units. I was skeptical about a 'water cooler' but the Coolizi actually made my bedroom livable during the July heat wave. Filled it with ice water before bed and the room dropped from 84 to about 73. Not magic, but for $137 it's the best renter solution I've found. Runs quiet on low too.”
“Bought two — one for my home office and one for my mom's place in Phoenix. In dry Arizona heat this thing is genuinely impressive, like a mini swamp cooler that actually works. My mom's apartment went from stuffy to comfortable in maybe 20 minutes. Only knock: you do have to refill the tank on the hottest days. Worth it for the electricity savings alone.”
“I work from home and my home office faces the afternoon sun. It was literally unusable from 2-5 PM without the AC blasting. The Coolizi sits on my desk and keeps me comfortable for pennies. My power bill hasn't gone up at all.”
“Denver summers are dry and hot. This little unit is a lifesaver in my apartment. I was skeptical about evaporative cooling but it genuinely drops the temperature by 10-12°F in my bedroom. I bought a second one for the living room.”
“My landlord won't let me install a window AC. I was melting until I found this. It's quiet enough for my baby's nursery and the 30-day guarantee made me feel safe trying it. Keeping both units I ordered.”
“We don't get extreme heat often but when we do, this thing delivers. Super easy to move from room to room. I take it to my patio when I'm working outside too. Versatile little gadget.”
“During the June 2026 heat wave I couldn't function. A friend recommended this and I'm so glad I listened. My studio apartment is 450 sq ft and it keeps the whole place comfortable. And it uses barely any power.”
“In Vegas dry heat this works like a mini swamp cooler. I was amazed at the temperature difference. I run it 10 hours a day and my electricity bill barely budged. A real AC would cost me $200+ more per month.”
“I was worried about humidity since I'm in the South. It's not as dramatic as in dry climates but it still makes a noticeable difference in my small apartment. The fan alone is worth it for air circulation.”
“My apartment has old radiators and no AC. This thing got me through a 98°F July week without any issues. The ice water trick works great — drop some ice cubes in the tank and the air comes out noticeably colder.”
It genuinely cools the air using evaporative technology — warm air passes through a water-soaked honeycomb filter and exits up to 18–20°F cooler in dry conditions. It is not a compressor-based AC, so in very humid weather (above 55% RH) the cooling effect is reduced, but it still outperforms a plain fan.
No. Coolizi is fully self-contained. There is no hose, no window kit, and no installation. You fill the tank, plug it into a standard outlet or USB-C power bank, and turn it on. This is what makes it ideal for renters and apartments with casement or unusual windows.
On Low fan speed in dry heat, a full 750 mL tank lasts roughly 5–7 hours. On High speed or in very hot weather, expect closer to 4–5 hours. When the tank runs dry the unit automatically switches to fan-only mode so it never runs the pump dry.
We measured 42 dB on Low (from 6 feet away) — quieter than most box fans and suitable for sleeping. On High it reaches about 58 dB, which is noticeable but comparable to a standard tower fan on its highest setting.
Evaporative coolers are most effective below 50% relative humidity. In humid climates you will still get a cooling breeze and the fan function, but the temperature drop will be smaller (around 5–8°F). If you live in a consistently humid area, manage expectations accordingly.
The Coolizi draws approximately 18 watts — roughly 1/50th of a typical 1,000W portable AC. Running it 8 hours a day for a month at the U.S. average rate of $0.17/kWh costs under $1, compared to roughly $40 for a hose-style portable AC.
Yes. Purchases through the official store include a 30-day money-back guarantee and a 12-month manufacturer warranty against defects. If the unit arrives damaged or fails within the warranty period, contact support for a replacement or refund.
To avoid counterfeits, buy only through the official Coolizi store linked on this page. The current summer promotion offers up to 71% off with shipping included, and stock is limited during peak season.
The Coolizi Cooling Ace is sold exclusively through the official store. The summer 2026 promotion is live now with up to 71% off and a 30-day money-back guarantee — but stock moves fast during heat waves.
Get Coolizi at 59% OFF →