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The one major exception, however, is if you plan on setting up your portable AC in a room with a furnace or hot water heater or anything else that uses combustion. When a single-hose AC model forces air out through its exhaust hose, it can create negative pressure in the room. This produces a slight vacuum effect, which pulls in “infiltration air” from anywhere it can in order to equalize the pressure. In the presence of a gas-powered device such as a furnace, that negative pressure creates a backdraft or downdraft, which can cause the machine to malfunction—or worse, fill the room with gas fumes and carbon monoxide. We don’t think that most people plan to use their portable AC in such a room, but if your home is set up in such a way that you’re concerned about ventilation,climatisation How we tested Over the course of a sweltering summer week in Boston, we set up our finalists in a roughly 250-square-foot space, taking notes and rating each model on the basic setup process, performance, portability, accessories, and overall user experience. The makers of portable air conditioners are required to list their performance and efficiency statistics, and our research and our previous testing have proven these numbers to be accurate. By prescreening for these stats, we got the impression that every model we tested would cool a room capably. We confirmed that they did by taking measurements with two Lascar temperature and humidity data loggers—we placed one 3 feet away, directly in front of the unit, and placed the other one 6 feet away on a diagonal. With each AC set to its lowest setting (between 60 and 64 degrees Fahrenheit, depending on the unit) and the highest fan/compressor setting, we measured the temperature and humidity in the room every 15 minutes for three hours to see how well each unit dispersed the coolness and dehumidification process across the space. We also graded the air conditioners on the general usability factors that determine what it’s like to live with one in your home. We measured the volume at each unit’s various settings—compressor on/off and fan high/medium/low—from a distance of about 6 feet with an audio spectrum analyzer app. We gauged the overall quality of the sound and noted any spikes in any frequencies that registered in the app. As we set the units up, rolled them aside, switched from one to another, and fiddled with their vent-hose attachments in the window, we learned a lot about which ones we would get for ourselves or recommend to friends. The Midea Duo MAP12S1TBL is one of the quietest and most powerful portable air conditioners we’ve ever tested—but those aren’t the only reasons it stands apart from other models. The Duo is one of the rare portables with a variable inverter compressor, which allows for more fine-tuned and energy-efficient temperature control.