BTU/h on the box, litres of condensate on the floor · review
Gymax KU65297IJ-BMDE review
A 16 000 BTU 4-in-1 portable air conditioner that adds a heating mode alongside cooling, dehumidifying and fan, for rooms Gymax rates up to 45 m². It's controlled by remote, on-unit panel, or WiFi through the 'Smart Life' app, and is the largest and most expensive of the four units in this comparison.
The bottom line The largest-capacity and only heating-capable unit in this comparison, at a price and shipping weight to match. It suits bigger rooms that need both cooling and supplementary heat from one appliance, but — unlike the other three units here — it was confirmed for sale on only one of the six marketplaces checked, so availability should be reconfirmed before ordering.
The only heating-capable unit in this comparison
Gymax rates the KU65297IJ-BMDE at 16 000 BTU, more than double the 7 000–7 500 BTU of the other three units checked for this comparison, and publishes coverage up to 45 m² against 20–25 m² for the entry-priced units. What sets it apart functionally is a published heating mode: alongside cooling, dehumidifying and fan (three speeds — high, medium, low), Gymax states the KU65297IJ-BMDE can also heat a room, across the same 16–32 °C adjustable range. None of the Temprium, Okyuk or Dreo units in this comparison publish a heating function.
Controls and comfort features
The unit is operated by remote (Gymax states roughly 5 metres of range), an on-unit control panel, or WiFi through Gymax’s “Smart Life” app. A sleep mode, timer function and child lock are also published, aimed at unattended overnight operation. Gymax doesn’t publish a noise (dB) figure for this model, a gap it shares with the Okyuk unit in this comparison, and unlike Dreo’s published 45 dB(A)/61 dB figures.
Size, weight and installation
At 34 kg (38.4 kg including packaging), the KU65297IJ-BMDE is substantially heavier than the other three units in this comparison, which range from about 20 to 27 kg — a reasonable trade for roughly double the cooling capacity, but worth factoring in if it needs to be moved between floors. The included window kit is stated to fit openings up to 120 cm in height and width; Gymax doesn’t publish a minimum width the way the Okyuk (43 cm) and Dreo (43 cm) kits in this comparison do.
Confirmed for sale on one market
Keepa data confirmed a valid New-condition price only on Amazon.de, at roughly 1 600 €, at the time of checking. On the other five marketplaces checked for this review — Amazon.fr, .it, .es, .com and .co.uk — the ASIN wasn’t found as a listing at all, which is a different situation from a listing that’s simply out of stock. That’s a clear contrast with the Temprium, Okyuk and Dreo units in this comparison, each of which was confirmed with a valid price on all four European markets checked. A buyer outside Germany should treat this model as unconfirmed until checking current availability directly.
Who this actually suits
Given the combination of 16 000 BTU, a stated 45 m² coverage and a heating mode, this is the pick for a larger room — an open-plan living area or a room with poor insulation — where one appliance needs to handle both summer cooling and shoulder-season heat. For a bedroom or small office, the smaller and considerably cheaper units elsewhere in this comparison are a closer match to both the room size and the budget.
Prices quoted in this text were read on 2026-08-24. The live price is at the top of the page.
Where this one sits in its aisle
At 1600 €, it is the 4 cheapest of the 4 models in this category published here.
Cheapest in the aisle240 €
Median460 €
Dearest in the aisle1600 €
What we like, and what we don't
Strengths
Only unit in this comparison with a published heating mode, alongside cooling, dehumidifying and fan
Largest published room coverage of the four units checked: up to 45 m², against 20–25 m² for the entry-priced units
Three fan speeds, a child lock, and a sleep mode with timer, all published
WiFi and "Smart Life" app control in addition to remote (5 m range) and an on-unit panel
Compromises
Confirmed for sale only on Amazon.de among the six marketplaces checked; the ASIN wasn't found as a listing at all on FR, IT, ES, US or GB at the time of checking
By far the heaviest unit in this comparison: 34 kg item weight, 38.4 kg shipping weight, against 20–27 kg for the other three
At ≈1 600 €, more than three times the price of the next most expensive unit in this comparison
No published noise (dB) figure, refrigerant type, or energy class
Specifications
Cooling capacity
16 000 BTU
Modes
Cool / heat / dehumidify / fan (3 fan speeds)
Room coverage (manufacturer)
Up to 45 m²
Temperature range
16–32 °C
Controls
Remote (5 m range), WiFi + "Smart Life" app, on-unit control panel
Window kit
Fits openings up to 120 cm height/width
Item / shipping weight
34 kg / 38.4 kg
Amazon reference
B0H7SB4JJG (confirmed for sale on DE only, of 6 markets checked)
Questions people actually ask
Does the Gymax KU65297IJ-BMDE heat as well as cool?
Yes — Gymax publishes four modes for this model: cooling, heating, dehumidifying and fan, with an adjustable temperature range of 16 to 32 °C. It's the only one of the four units in this comparison with a published heating mode; the Temprium, Okyuk and Dreo units here are cooling/dehumidifying/fan only.
What window sizes does it fit?
Gymax states the included kit fits window openings up to 120 cm in height and width. Unlike the Okyuk and Dreo units in this comparison, it doesn't publish a minimum width, so it's worth checking the kit's actual adjustment range against a specific window before buying.
Is it available outside Germany?
At the time of checking, Keepa data showed an active New-condition offer only on Amazon.de. On the other five marketplaces checked — France, Italy, Spain, the US and the UK — the ASIN wasn't found as a listing at all, unlike the Temprium, Okyuk and Dreo units in this comparison, which were each confirmed on all four European markets.
Our score
8.4/ 10
The largest-capacity and only heating-capable unit in this comparison, at a price and shipping weight to match. It suits bigger rooms that need both cooling and supplementary heat from one appliance, but — unlike the other three units here — it was confirmed for sale on only one of the six marketplaces checked, so availability should be reconfirmed before ordering.
Who this one is for
Larger rooms up to 45 m² where one appliance needs to both cool in summer and add supplementary heat, bought from a market where it's confirmed in stock.
Compared with its closest rivals
Same category, nearest prices. Only the specifications every one of them states are shown — a half-empty column compares nothing.
Model
Price
Cooling capacity
Temperature range
Controls
Amazon reference
Gymax KU65297IJ-BMDE
1600 €
16 000 BTU
16–32 °C
Remote (5 m range), WiFi + "Smart Life" app, on-unit control panel
B0H7SB4JJG (confirmed for sale on DE only, of 6 markets checked)
A 7 500 BTU single-hose portable air conditioner Dreo positions for bedrooms and offices, built around what it calls a true drainage-free system: condensate is evaporated automatically via an internal pump and sensors, Dreo says, even up to 90% humidity. Operating noise is published at 45 dB(A) (61 dB sound power), with control through the Dreo app or Siri/Alexa/Google Home voice commands.
Best for: Bedrooms or offices where quiet operation and hands-off condensate handling matter more than a low upfront price.
A 7 000 BTU single-hose portable air conditioner for rooms up to 25 m², built around an R290 refrigerant system Okyuk rates at energy class A. It includes an LED display with a water-level indicator, a 24-hour timer, and a window kit Okyuk describes as fitting widths from 43 to 135 cm, including a stated compatibility with 95% of German sliding windows.
Best for: Buyers who want a wider 25 m² coverage claim and a published refrigerant/energy class, but don't need app or voice control.
A 7 000 BTU / 2.0 kW single-hose portable air conditioner for rooms up to 20 m², with touch-panel, remote, app and Alexa/Google Assistant control. Temprium states a built-in self-evaporation system that significantly cuts how often the tank needs draining, and ships a window seal kit it describes as fitting most European window types.
Best for: Renters or small bedrooms up to about 20 m² who want app and voice control without paying for a higher-BTU unit.
