Friedrich Wallmaster Wall Air Conditioners not only cool a room of up to 400 square feet but can also heat a room of up to 400 square feet in the winter. It\u2019s one of the reasons we\u2019ve chosen it as a best through the wall air conditioner. That, and the UL Listing too. It\u2019s never a bad thing to have quality air circulating.\r\n\r\nWhy We Like It - Friedrich Wallmaster\r\nThe Friedrich Wallmaster is an ideal in-wall air conditioning unit if you're looking to cool a room if up to 400 square feet. The 9.6 EER is also among the lowest we\u2019ve seen and should be able to save you a ton of money in the long run. And although the unit is very heavy it will also be very stable and have commercial-grade durability.\r\n\r\nPerformance\r\nThe Friedrich Wallmaster boasts an impressive cooling power of 10,000 BTU. Translated, it can cool a room of up to 400 sq ft. if you\u2019d like more, or even less, check out the Keystone Air Conditioner for its variance of BTU models. As an added bonus, the Friedrich Wallmaster can also provide electric heat to a room of the same size which will be great for those cold winter months.\r\nEnergy Efficiency\r\nThe Friedrich Wallmaster comes with an EER rating og 9.6, which is one of the lowest we\u2019ve seen. This grants it the Energy Star certification in-wall air conditioners should strive towards. This unit's cousin, the Friedrich Wall Air Conditioner, is another Energy Star certified model if you want to check it out. The Friedrich Wallmaster is also UL Listed so you know it won\u2019t give you any problems with indoor air quality too!\r\nFiltration\r\nLike all the in-wall air conditioners in its class, the Friedrich Air Conditioner contains a washable, antimicrobial filter that should be washed at least once a month. It\u2019s cumbersome but a necessary inconvenience if you want the freshest air possible. And considering all air conditioners require you to do this we aren\u2019t holding it against the Friedrich.\r\nDurability\r\nAt 104 pounds, the Friedrich Wallmaster is the heaviest in-wall air conditioner we\u2019ve seen. While this may cut down on rattling noise because of the stability, it seems unacceptable that units with higher BTUs can be 50 pounds less than this. Consider the KSTAT10-2C Keystone Air Conditioner if you want something more lightweight.\r\nValue\r\nThe Friedrich Wallmaster isn\u2019t a smart, wi fi enabled device, but neither are the majority of its competitors so we won\u2019t be holding that against it. The unit fits competitor\u2019s 2 inch wall sleeves, including Fedders A and B, which makes it perfect for replacing an older model. It also comes with a remote control so you can control it from afar. Great for when you can\u2019t unstick from the couch during a humid summer day.\r\nFriedrich Wallmaster Wrap Up\r\nThe Friedrich Wallmaster series does have some kinks, but it\u2019s, overall, a great unit that we\u2019re sure you\u2019ll appreciate if you do decide to buy one. It is heavy, so make sure you\u2019re getting some friends to help you lift and install the thing. The lack of smart options shouldn't really be too much of an issue considering you can control it with the included remote too.