Honeywell MM14CHCS Portable Air Conditioner If you are looking for The Best Portable Air Conditioner, it should be Honeywell MM14CHCS (available for around $535). After over 15 hours of research, Honeywell is our clear winner. For a reasonable price, it packs quite the punch at 14,000 BTU. It’s sleek, stylish, efficient and eco-friendly. And the great thing about it is that you can also use it as a portable heater during winter. We also talk about a few other alternatives below, but for most people who are looking for a portable air conditioner, Honeywell MM14CHCS is our top pick. At 14,000 BTUs, Honeywell MM14CHCS easily cools areas up to 550 square feet. It’s a 4-in-1 portable unit that combines air conditioner, dehumidifier, fan and heater all into one single unit. It also comes with a full-function remote control for use from across the room. You’ll love the Digital LED display and precise-feature touch controls. The fan runs 3 speeds and the automatic shutoff timer ranges from 1 to 24 hours. 4 castor wheels let you easily move it around and from room to room. When you purchase Honeywell MM14CHCS, the box comes with everything you need – which includes a flexible exhaust hose and an easy-to-install window venting kit. You can easily remove the window vent when the AC is not being used. It has fairly powerful air flow at 265 CFM (Cubic Feet Per Minute). Despite being a fairly heavy-duty portable air conditioner, Honeywell MM14CHCS runs pretty quiet. It’s sound output is only 54 dbA. It’s no bucket, no-drip design uses auto-evaporation system – which lets you continually operate the AC for hours without having to drain water or empty a bucket. It’s 12,000 BTU heat pump will keep you warm during the winter as well. The heat pump covers area up to 400 square feet. Read some reviews from recent buyers here. Buy on Amazon   Checkout Honeywell MM14CHCS on Amazon.   What “power” portable air conditioner do I need? Before we move on to exploring other alternatives to Honeywell MM14CHCS, I want to briefly talk about how the “power” of an air conditioner is determined and what size/power air conditioner you need. The cooling power of an air conditioner is measured in British Thermal Units (BTUs). Generally speaking, a BTU is the amount of energy needed to cool or heat one pound of water by one degree Fahrenheit. In air conditioner (AC) lingo, however, a BTU measures the amount of heat an AC unit can remove from the room. Therefore, the size of your area determines how many BTU- air conditioner you will need. You don’t want a very low BTU – since it will be running constantly to get to your comfort zone. When an AC is underpowered for space, it’s not only not-energy-sufficient  but it will not quite cool the space to your comfortable range.  And, the air conditioner unit might burn out sooner too from the constant uphill battle. On the other hand if the unit is too large, it will cool the room quickly, but only remove some of the humidity. This leaves the room with a damp, clammy feeling. It is important to get a  properly sized unit that will remove humidity effectively as it cools. In order to figure out the right size portable AC unit for your space, do the following: 1. Find the square footage of the area to be cooled. To get the square footage, simply multiply the length of the space by its width. So, if my space is 10 feet wide and 16 feet long, your area is 160 sq. ft. 2. Then measure your square footage against the following chart from Energy Star. So, in my case (160...