DREO AC318S
(9 reviews)
The portable air conditioner that promises to (almost) never need emptying by hand: patented automatic evaporation system, 7500 BTU, app, voice or remote control.
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Key features
- Power: 2.2 kW (7500 BTU)
- Connectivity: WiFi, DREO app, compatible with Alexa, Google Home and Siri
- Noise level: 45 dB(A) on the quietest setting (61 dB sound power)
- Patented drainage-free system, working up to 90% ambient humidity
In detail: DREO AC318S, connected 7500 BTU portable air conditioner with drainage-free system
DREO, a brand best known for its fans before moving into portable air conditioning, enters this segment with a strong technical claim: a patented drainage-free system able to automatically re-evaporate condensation water even in very humid environments, up to 90% relative humidity. In practice, an algorithm paired with sensors and a built-in pump handles this recycling without any user intervention, a promise rarely delivered at this level on entry and mid-range portable air conditioners, where regular manual draining remains a classic pain point.
Rated at 2.2 kW (7500 BTU) with an advertised cooling reach of 4.3 metres, the AC318S targets medium-sized bedrooms and offices, with an adjustable temperature range from 16 to 30°C. Its patented acoustic isolation system brings the noise level down to 45 dB(A) on the quietest setting (61 dB sound power), a figure that places it among the quieter units in its category. Sleep mode rounds off this comfort focus by automatically lowering fan speed and letting the temperature rise by 2°C over 4 hours, to avoid waking up cold in the middle of the night.
On control, the unit combines a touch panel, magnetic remote and the DREO app, with voice compatibility extending to the market's three main assistants: Amazon Alexa, Google Home and Siri. The 3-in-1 function (cooling, fan, dehumidifying up to 2.5 L/h) covers most year-round needs, while the R-290 refrigerant, more environmentally friendly than traditional gases, rounds off this carefully engineered approach.
Installation relies on a universal window kit including a 150 cm exhaust hose, a modular panel (43 to 135 cm) compatible with tilt-and-turn, sliding and casement windows, plus a wall adapter for unusual setups. DREO's round-the-clock customer support completes the package. The main barrier to purchase right now remains availability, with the unit regularly out of stock across major European markets.
Technical data
Detailed characteristics
Performance
| Type?General technical category the unit belongs to (portable, split, evaporative...). | Portable monobloc, with exhaust hose |
|---|---|
| Cooling capacity?The unit's cooling power, expressed in kW or BTU/h (British Thermal Unit per hour). | 2.2 kW (7500 BTU) |
| Energy class?European energy efficiency class (from A+++ to G), showing how the unit's consumption compares with similar models. | A |
| Dehumidification?Amount of water removed from the air by the unit, usually expressed in litres per 24 hours. | Up to 2.5 L/h |
| Airflow?Volume of air moved by the unit each hour, in m³/h: the higher it is, the faster the room's air is refreshed. | 235 CFM (about 400 m³/h), advertised cooling reach of 4.3 m |
| Noise level?Noise emitted by the unit, in decibels (dB(A)). As a reference, a normal conversation is around 60 dB(A). | 45 dB(A) on the quietest setting (61 dB sound power) |
| Power draw?Electrical power drawn by the unit while running, expressed in watts (W). | About 800 W running (estimated from cooling capacity, not published by DREO) |
| Refrigerant?Gas used in the cooling circuit. R290 and R32 are now favoured for their lower environmental impact. | R-290 (propane, low environmental impact) |
Features and connectivity
| Functions?Operating modes offered by the unit (cooling, fan, dehumidifying, heating...). | Cooling, fan, dehumidifying (3-in-1), sleep mode |
|---|---|
| Included accessories?Items supplied with the unit (window kit, remote control, hose...), in addition to the unit itself. | 150 cm exhaust hose, magnetic remote control, universal window kit (casement, sliding, tilt and turn) and wall adapter |
| Connectivity?Ways to control the unit remotely (mobile app, WiFi, voice assistants...). | WiFi, DREO app, compatible with Amazon Alexa, Google Home and Siri |
Dimensions and power supply
| Temperature range?Minimum and maximum temperatures the unit can be set to. | 16 to 30°C |
|---|---|
| Weight?The unit's weight, an important factor for a portable air conditioner regularly moved between rooms. | About 25 kg |
| Dimensions?Width, depth and height of the unit (W x D x H). | About 35.5 x 38.5 x 63 cm (width x depth x height, height confirmed by all sources, width and depth vary slightly between markets) |
| Power supply?Electrical voltage and frequency required to run the unit. | 220-240V~, 50Hz (European mains) |
Additional information
| Sleep mode | Automatically lowers fan speed and raises temperature by 2°C over 4 hours |
|---|---|
| Manufacturer warranty?Period during which the manufacturer commits to repairing or replacing the unit in case of failure, excluding damage or misuse. | 2 years |
Comparison
Around £500, the DREO AC318S sits alongside the Klarstein Kraftwerk Smart 10K, another connected portable air conditioner, in searches like "DREO vs Klarstein air conditioner". Here is how the two compare, based on the public specifications of both manufacturers.
| Criterion | DREO AC318S | Klarstein Kraftwerk Smart 10K |
|---|---|---|
| Cooling capacity | 2.2 kW (7500 BTU) | 2.9 kW (10,000 BTU) |
| Drainage | Drainage-free system up to 90% humidity | Standard manual draining |
| Noise level | 45 dB(A) minimum | 48 to 65 dB(A) |
| Voice assistants | Alexa, Google Home, Siri | Alexa, Google Home |
| Price observed | ≈£495 | ≈£514 |
In short, the Kraftwerk Smart 10K offers higher cooling power and airflow for use in larger rooms, but requires regular manual draining. The DREO AC318S focuses on quiet comfort and no drainage hassle, plus Siri compatibility, at the cost of slightly lower cooling capacity.
Related video
Video: DREO AC318S Portable Air Conditioner Review | 8000 BTU Smart Cooling!
Our tester's verdict: Christophe Delpuech
The AC318S's central claim, its drainage-free system, broadly holds up according to the reviews we looked at: most users confirm never having had to empty a tank, even during extended summer use, with the re-evaporation algorithm genuinely doing what it promises. The noise level, around 45 dB(A) on the quiet setting, is also praised as one of the unit's strengths, with several buyers describing it as usable in a bedroom overnight without disturbance, partly thanks to the sleep mode that reduces fan speed while letting the temperature drift up slightly. Control via the DREO app works well for most, and compatibility with all three major voice assistants (Alexa, Google Home and Siri) is a genuine plus rarely offered at this price point. The universal window kit, with a modular panel suited to tilt-and-turn and sliding windows alike, is also appreciated for its flexibility across European window types. The most significant caveat is not about the unit itself but its availability: at the time of writing, the AC318S is regularly out of stock among retailers, which strongly limits the chances of an immediate purchase. One technical point worth watching, as with many connected air conditioners, a minority of reviews mention occasional WiFi disconnections requiring a restart. For anyone prioritising quiet nights and no drainage hassle, the AC318S remains a solid choice, provided you can actually find it in stock.
Frequently asked questions: DREO AC318S, connected 7500 BTU portable air conditioner with drainage-free system
Yes, according to the vast majority of reviews: the re-evaporation algorithm, paired with sensors and a built-in pump, handles condensation water automatically even in very humid environments, up to 90% relative humidity, without manual intervention in the vast majority of household use cases.
Yes, this is one of its strengths: with 45 dB(A) on the quietest setting and a sleep mode that reduces fan speed while letting the temperature drift up by 2°C over 4 hours, it ranks among the quieter portable air conditioners in its category.
Yes, the universal kit includes a modular panel from 43 to 135 cm compatible with tilt-and-turn, sliding and casement windows, plus a wall adapter for unusual setups.
Availability is limited at the time of writing: the unit is regularly out of stock among retailers across major European markets. It is worth checking real-time availability before planning an urgent purchase.
Yes, it stands out with compatibility across the market's three main assistants: Amazon Alexa, Google Home and Siri, in addition to control via the DREO app and the included remote.
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Page published on 31 July 2026