Honeywell MM14CHCS – An Aircon and a Heater


The Honeywell MM14CHCS portable unit functions as both an air conditioner and a heater, which adds value for the money paid. It's also not as bulky as other portable air conditioners.


It's not as intuitive as other units, and just because you've had a portable AC before doesn't mean you know how to use this one. You have to read the manual and, in some cases, make a lot of modifications for it to work properly.

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The Honeywell MM14CHCS 14,000 BTU Portable Air Conditioner with Heat Pump both cools and heats an area up to 450 sq. feet. The air conditioner has 14,000 BTU’s while the heater has 12,000 BTU’s. It doesn’t require permanent installation, and the castor wheels make it easy to move from one room to another, and to store when not in use. It comes with an LED display that also works with a remote control. The venting kit only comes with one exhaust hose, but it can be modified to work with two hoses.

Performance and Features

Although the product manufacturer lists the unit’s ability to heat and cool a room up to 550 sq. feet, without some modifications, it really only works up to about 450 sq. feet. With only one exhaust hose, the unit pulls the air in from outside, which causes the unit to dump that air inside. For the cooling function, that means hot air gets drawn inside, making it that much harder to cool down the room. It does the same thing with cold air for the heater. To combat this, you can purchase a second venting kit to install a second exhaust hose. Another recommendation is to purchase an insulated flexible duct R8 silver jacket and place it over the white vinyl heated air duct. This keeps the heat inside the exhaust jacket and minimizes the work the unit has to do.

Another performance issue this unit has is that it leaks water. The internal tank is rather small, so as it dehumidifies the air, the water builds up. It doesn’t evaporate the water as the manufacturer suggests, so it will leak unless you drain it. The solution is to use a short drain hose and a bucket. Unfortunately, that solution is rather unsightly. Depending on where you plan to place this unit, it might be worthwhile to attach a long drain hose and allow it to drain outside.

There are a few notable features of the unit. It is portable, which means it doesn’t have to be permanently installed in any one room. The unit also allows you to save on your electric bill each month since you’re not trying to cool an entire house, and it comes with a 24 hour energy-saving programmable timer which helps you control its energy consumption even more. There are four setting features for the unit: air conditioner, heater, dehumidifier, and fan. The dehumidifier removes up to 95 pints/24 hours of moisture in the air, and the fan produces a powerful air flow at 265 cubic feet per minute (CFM).

The unit only cools up to 450 sq. feet without modifications.

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Design and Usability

This unit is silver and black, and less bulky than other units on the market. It is 34.02 inches in height, 19.92 inches in width, 15.79 inches in depth. It weighs about 75 pounds right out of the box, but gets heavier as it collects water. It also comes with window brackets that adjust from 19.9 inches to 47.25 inches. However, you can contact Honeywell directly if you need brackets in sizes outside that range.

One of the best reasons to use this machine is that it is both an air conditioner and a heater. These work great in basements where a central unit doesn’t necessarily reach the room. It functions year round to keep your room comfortable without the expense of a central unit. And, because it’s portable, you can move it around as needed. If you want your bedroom colder at night, but don’t want to waste the money cooling the rest of the house, a portable air conditioner makes that possible.

This unit’s function as a dehumidifier can vastly improve the comfort of your home. Hot, humid days are uncomfortable to say the least, but humidity contributes to the growth of mold, dust mites, and fungus. These are not good for anyone; however, they are particularly bad for people with allergies or asthma. Those in higher humidity regions may need to drain their units more often than those in lower humidity regions, but the unit does a good job of pulling excess moisture from the air.

The unit does a good job of pulling excess moisture from the air.

Noise Level

Honeywell rates its unit at 55 dBA, which is the equivalent of a household dishwasher. However, the unit runs louder than 55 dBA, especially when the compressor is running at full capacity. It’s not necessarily the compressor making the noise, though it does make some. There are parts on the back of the unit that rattle when the compressor runs, which makes a very loud noise. You can try to tighten any loose pieces to quiet the rattle, but if the pieces won’t tighten, then this unit may not be good for the bedroom when you’re trying to sleep.

There are parts on the back of the unit that rattle when the compressors runs.

Energy Consumption

The Energy Efficiency Rating (EER) for this unit is 10, which is above average for most portable air conditioners. There are a few units with higher ratings, but 10 is an excellent rating considering it is both a heater and an air conditioner. It allows you to save money during peak times of the year when running a central unit would be too costly, and it comes with a programmable thermostat, which gives you even more control over its consumption.

This unit will save you money whether you use it as a heater or an air conditioner.


Overall, this product is acceptable for anyone who wants a portable air conditioner and heater. The flexibility of a portable unit allows you to use it anywhere in the house, rather than permanently installing a unit in one place. And, it’s EER of 10 means that it will save you money each month on your electricity bill, whether you use heat or air conditioning. Another bonus is that it dehumidifies the air quite well.

The drawbacks to this unit are that it isn’t very intuitive to use initially, and it does require some modifications to work the way you want it to. The unit really should come with two exhaust hoses to keep up with 14,000 BTU’s on the air conditioning side, and 12,000 BTU’s on the heater side. You can order another one and install it, but it’s more work than purchasing a unit that already comes with two exhaust hoses. Additionally, the unit doesn’t evaporate the water from the internal tank as suggested. It must be drained or it will leak.

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