I'm vehicle technology engineer and now have longer occupied myself with the issue of housing cooling. I can wholeheartedly the review by Andreas Fischer connect me. Knowing the technical constraints of a mobile air conditioner to get regarding cooling capacity, package, volume and processing is not to the ACP-24, unfortunately, currently the only dual-hose device on the market, over. All other devices on the market are significantly worse in these respects. Also, each compared with a Einschlauchgerät the competition lags, since in this case only 60% of the declared capacity for cooling in the room effectively arrive due to the after suction of warm outside air. (Reputable calculations of scientific work) who had one semester physics, also understands that, however well any attempts of sealing of windows with old mattresses or 'expert' films not help. This will, at best, that is absolute airtightness achieved by further reducing the air flow rate of Einschlauchgeräten and can dissipate the heat from the refrigerant circuit even worse. Thus, one can the ACP-24 compared to the 2.4 kW cooling capacity with approximately 4kW of Einschlauchgerätes. Before purchasing you have to know how in its Installation Environment achieves optimum, ie air density possible implementation of the two tubes of course. A tilted window here is not the optimum. I've built a solution for my apartment as follows. Once one with hinges in the center shared board (30cm high), which I can pinch airtight in the shade guide. Then I leave then the shade down completely and can lead through two holes cut the hoses through the open on one side remotest outward. The edges of the board, I have additionally sealed with stick-on seals. So I can do it in continuous operation my approximately 60sqm large living room even at 35 ° C to 23.5 ° C to -24 ° C hold. And before going to bed I put the unit on in the bedroom for an hour and can be used without the blanket asleep durchzuschwitzen quickly. My conclusion: Who is not happy with the ACP-24, has to resort only option on a proper split system. Whether such an investment for German latitudes with a maximum of 25 proper summer days worth, everyone must decide for themselves. In addition to the acquisition, the necessary wall opening, etc. this is also the maintenance and care not to mention such a fixed split system. With the additional cost of a split system, I can probably pay the electricity bill of the ACP-24 the next 15 years loose.