Mitsubishi Mr. Slim Heat Pump Overview

The Mitsubishi Mr. Slim heat pump comes with a split ductless design. Mr. Slim offers up to 14.5 SEER and 8.2 HSPF when part of an indoor/outdoor system, and has a 2.5 to 3 ton capacity range. With a sound level as low as 26dB, Mr. Slim provides quiet, energy-efficient operation, along with effective zone heating. The M-series comes with a remote control which allows you to control the temperature, fan speed, and more. The remote also has a timer function.

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Consumer Reviews of Mitsubishi Mr. Slim


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #2 of 3 Mitsubishi Heat Pump
  • 35.71% of customers recommended

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Mitsubishi Mr. Slim Heat Pump Reviews

Showing 16-20 of 28 reviews

"Stupid replacement filters"

1.0 rating
Very Unsatisfied

I had the MAZ-FE0NA indoor unit installed over a year ago. I finally got around to replacing the enzyme filter only to find out that you cannot buy just the removable blue fabric filter that sits inside the heavy black plastic holder. You have to buy a new black plastic piece in order to get the fabric. This is ridiculous. The black plastic piece will last forever and cost many times what the fabric costs. I am sure they do this to justify charging you $50 for a $.05 product. They clearly do not believe what they say about protecting the environment.

Daniel Lewis

United States

"mitz first winter"

5.0 rating
Very Satisfied

With my April electric bill I have a complete winters cost of using a Mitsubishi mini split. First, I did not expect this unit to provide one hundred percent of my heat needs, but that is nearly what has happened. I am comparing electric bills November through April and gallons of heating oil used (hot water baseboard) and hot water use. Here in central Virginia the season 2014 and 2015 have been very close in degree days so it's apples to apples. My cost for 2014 was over $2000 dollars for oil. This year, using this years electric bills and oil used priced at last years higher price resulted in a savings of $1100. Of course, oil is priced under $3.00 per gallon so my actual out of pocket cost this year is under $750.00. I'm thinking a payback in under four years!

Robert Fallin

Richmond, VA

"Don't believe the lies"

2.0 rating
Somewhat Unsatisfied

I purchased an entire whole house setup because the home I bought did not have AC. I live in New Hampshire. I purchased 10 tons of cooling – 2-36,000 units and the 48,000 unit. This was sold to me as 'this will heat your home, too'. Fast forward to two years of use, and I can tell you this: 1. The AC works well – be sure it's sized properly for your use. I have one section of the home where it's not sized properly and I'm having the contractor come in to add another head. 2. The heating piece is good down to 30 degrees outside, at the most; 20 degrees is worst case. Below that, it's a useless pig that will kill your electric bill. Let me be clear. If you expect these units to perform below 20 degrees you're kidding yourself. My experience showed these usages: October: approximately 2200 Kw for my home. November: approximately 3200 Kw for my home. December: approximately 6300 Kw for my home (and a whopping $1500 electric bill to boot). Now I shutdown the Mitsubishi's from Thanksgiving to April. I have oil heat, hot water baseboard. That's what I use in the winter and it is a superior heat as well as cheaper, even when oil was $3.75 per gallon. I laugh when I see these installers claim they work down to -5 degrees; they're either lying or don't have experience with these units. To prove this, ask your installer: do you have a backup heat source at your home? The 3 installers that worked at my house and installed my system all had backup heat systems. Do not buy these for full-time heat. They are efficient in my area from September to the middle of November, and then from April to the end of May for heat. But during the dead of winter these things are useless. I repeat, useless. Make sure you have backup heat.

Dustin Lema

Seacoast, NH

"Mr. Slim heat pump nightmare."

1.0 rating
Very Unsatisfied

New coils, after I purchased it and paid for shipping, plus $1260 to install it (includes $236 coil cost). Since the unit ran without Freon for some time, my contractor advised that I should probably replace the whole unit, because it may have been compromised and it would be a costly nightmare to just replace the coils. So I asked customer service to at least offer a discount on a new outside unit, hoping for at least a discount of the $236 cost of new coils. They did agree to reimburse me for when I returned the existing coils, and then they declined and offered some excuse that ice damage may have caused a leak in the coils (even though there is no dent or visible damage). So right now, just to replace the outside unit, my discounted price is $1492. I hate to pay this for a unit that lasted only 24 months. Steer clear of this company, their flawed product, poor warranty, and lousy customer service.

B Cyburt

United States

"Do not purchase these units for heating"

1.0 rating
Very Unsatisfied

I live in Connecticut and purchased these units for my home. I spent over $30,000 and the units will not heat the home after it falls below 30 degrees outside. Cooling during the summer is fine, but they are not made well for heating. Tried to return the product and/or exchange them for something that would heat the home, and Mitsubishi would do nothing and the installer would do nothing. Buy a traditional furnace unit or try Samsung.

Ryan Murphy

Greenwich, CT

Other Mr. Slim Reviews

Comments on the Mr. Slim heat pump are generally positive. A consumer comment on stated that they supply minimal heat, but most other writers disagreed. A few other users complained about the price of the Mr. Slim heat pump, but almost all seemed pleased with the performance and quiet operation.

Mr. Slim Warranty

The Mitsubishi Mr. Slim heat pump comes with a 6-year limited warranty on the compressor and a 1-year limited warranty on parts.

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