Mitsubishi Mr. Slim Heat Pump
Updated: Jan 5, 2018Write a review
Read more about Mitsubishi Heat Pumps
Overview of the Mr. Slim
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.
Date created: 2018-01-05
Name: c thomas
Location: Ohio (OH)
"Mitsubishi ductless-The Money Pit"
Total waste of money and then money to attempt to fix (and attempt to find leaks that will never be found). Don't waste your time or money. Mitsubishi and their "Diamond Dealers" are clueless. If it wasn't for our Buck Stove and our old oil furnace we'd be freezing!
Date created: 2017-12-29
Name: J Bednar
Location: Battle Creek, MI
"Warning in Specifications"
The Mr. Slim system we have should not be sold by our local authorized Michigan dealer or allowed to be sold here by Mitsubishi. We found out the hard way that by its own specifications in the manual, and not covered in the troubleshooting section, that the guaranteed operating range goes down to -5 F. At that point it "may" stop until the outside temperature rises above that level. Ours definitely stops at or near that outside temperature, just when you need it most, and even a well insulated house gets cold quickly in those conditions. It otherwise works ok, though we already have ample leaking water from one unit when cooling, despite regular maintenance including filter cleanings. Hopefully that fix is modest, we'll find out next cooling season.
Date created: 2017-02-09
Name: Ashton Taylor
Location: Pittsboro, NC
I never knew a heating/cooling system could be so terrible. I am moving because of this. When it's below 35 outside, the unit does not heat. There are too many settings and buttons on the remote. The remote is not illuminated so you have to turn on a light to adjust anything in the night. It takes about 2 hours to warm the house up, then it's too hot. I've never had to adjust a heating/cooling system this much in my life. In the summer, two of my units leaked water, one pouring out. A service, which was a cleaning and a vacuuming out of the lines ran me $300. My winter bills are outrageous. Sometimes the unit will not blow anything for 10 minutes while it 'thinks' so you're sitting in a freezing or hot house while this system figures out what it needs to do. I've come home in the summer with my house terribly hot, with my animals panting, putting my pets in danger of heat exhaustion. I can't leave on a trip and trust that the pet sitter will know how to work it or that the unit will actually keep the house at the right temperature. One last thing, it dehydrated the heck out of you. I had to buy a humidifier because I was getting so terribly dehydrated from this machine. What a total piece of crap. Would probably work good for an added on room or workshop but not for your main source of air. I want to bash it to pieces.
Date created: 2016-12-07
Name: Carol Liedke
Location: SeaTac, WA
"Customer Service - useless"
After misplacing the Mitsubishi manual on my heat pump, I called to get some info on why my unit was not able to bring up my room temp above 64º - when the outside temp was 35º. (Filters have been cleaned) When I TRIED to do an on-line chat, I was offered the option of a phone call back or e-mail. I opted for a call back thinking it would be quicker. However, I was told that I was communicating with an INBOUND CALL CENTER. Okay, then WHY was I offered the "call-back feature"??? Update on 12/12/2016: Seattle City Light encourages their customers to invest in a ductless heating & cooling system to "save money". What they don't tell us is these units require expensive maintenance (see other reviews) after a few short years. Even trying to get filters is an issue NOT YET RESOLVED. The company that install this unit is no longer in business. So, now I am supplementing this unit with a portable heat source to bring up my room temp to 68º. So, WHERE IS THE SAVINGS?
Date created: 2016-10-08
Name: Tony Vick
Location: Vancouver, BC, Canada
"Indoor units rip water, installer unreachable"
Unit installed August 2015: 1 Mr. Slim unit outdoor and 4 indoor units. When we switch from cooling to heating, the indoor units steam up the room like a sauna and drip water. Now it is time to replace filters and I don't know where to buy the replacements. The installer does not answer phone calls or email. Tony Vick, Vancouver, BC, Canada.
Date created: 2016-08-24
Location: Sainte-Julie, Canada
Compressor broke after 7 years, it cost $2000. Electronic broke after 8 years, cost $1000 for the cards only. Very disappointed.
Date created: 2016-07-03
Name: L. Suitman
Location: South Carolina
"Piece of junk"
We had one installed in a 13x13 room. It has never cooled properly and in the winter, we have to run an electric heater to help heat the room. Room was built by us, so we know it was insulated over, under and all walls. We have had Freon added this season and were told there is a leak and the unit may have to be replaced. Installed in 2009.
Date created: 2016-06-28
Name: Carol Anne
Location: Cobourg, Ontario, Canada
We have had our Zuba throughout a Canadian winter and a hot summer. It has never let us down. It costs about $200 a month in the coldest weather (-20's) and about $30 a month during the hot summer months. We did notice we have to change the filter often...but otherwise the system is excellent!
Date created: 2016-05-09
Name: B Wood
Location: Altoona, PA
"Would not buy it again"
Unit installed by a diamond dealer in March 2014. March 2015 unit not heating. Unable to reach the dealer that installed it. Chat on Mitsubishi web site indicated that the local dealer was no longer a diamond dealer. Was given the name of two in our area. The new one we called checked it and said the compressor was bad but still under warranty. The bill including $100.00 for shipping of the compressor, amounted to $724.00 plus the original $4,325.00. In December 2015 it started tripping the breaker. Local dealer checked it and said nothing was wrong but to call if it continued to be a problem. That weekend after tripping the breaker 11 times we shut it down. It was checked again by the dealer who could not find anything wrong. We turned it back on only to find all we had was cold air. Called back dealer and was told they would check with Mitsubishi in the A.M. and get back to us. That was about 3 weeks ago and have not heard anything. Sent an email to Mitsubishi with no return answer. It is my opinion that even the diamond dealers are not well trained in the operation and target shooting problems. UPDATE 5/9/16: Previous review indicated I had contacted Mitsubishi regarding our unit. They did get back to me. Our local dealer worked on it a couple times and then Mitsubishi sent a representative. He was very knowledgeable about the unit. He said he would be in contact with the engineers. Long story short they tried several other options and eventually replaced the outside unit. The problems were related to the cold weather so it will take awhile to know if our problems are over. Mitsubishi worked with us and local dealer who was not the one who installed it. They did stand behind their product and we are very satisfied.
Date created: 2016-03-12
Location: Waterford, CT
Installed hyper heat multi zone. Constantly goes into defrost mode and it's noisy. A Mitsubishi tech finally came down but would not touch the unit. Had to have my heating guy do everything. After three times they still do not function correctly. They tell me this is normal operation. Should have gone with Fujitsu like I had in my other house.
Date created: 2016-01-13
Name: B Wood
Location: Altoona, PA
"Would not buy it again"
Unit installed by a diamond dealer in March 2014. March 2015, the unit was not heating. Unable to reach the dealer that installed it. Chat on Mitsubishi website indicated that the local dealer was no longer a diamond dealer. Was given the names of two dealers in our area. The new one we called checked it and said the compressor was bad but still under warranty. The bill including $100.00 for shipping of the compressor amounted to $724.00 plus the original $4,325.00. In December 2015 it started tripping the breaker. Local dealer checked it and said nothing was wrong but to call if it continued to be a problem. That weekend after tripping the breaker 11 times we shut it down. It was checked again by the dealer who could not find anything wrong. We turned it back on only to find all we had was cold air. Called the dealer back and was told they would check with Mitsubishi in the a.m. and get back to us. That was about 3 weeks ago and we have not heard anything. Sent an email to Mitsubishi with no return answer. It is my opinion that even the diamond dealers are not well trained in the operation and target shooting problems.
Date created: 2015-11-23
Name: Dennis Strecker
Location: Slidell, LA
"18,000 BTU heat pump"
This is the worst A/C unit that I have ever own. I have two units in a house I built 5 years ago. The Mr. Slim has a problem with the condensate pump not working. Had to replace one. I noticed extensive corrosion in the indoor unit after the latest replacement. I'm still having a problem so I just use the unit for heating. On the condenser I had to replace a circuit board several years ago and now I have to do it again. The repairman wanted to replace all 3 boards. The boards cost nearly as much as a new condenser. The multiple city unit I had to replace one of the two evaporators since it rusted out (approx. $1500.00 in labor alone). I suspect the other will be going out soon. Would never buy anything with the Mitsubishi name on it. Oh, I didn't mention the thermostats and controls don't track to the temperature setting especially on heat. Don't no why. Then there is the problem that few repairmen really know much about them. So good luck getting someone good to work on them. Never again!
Date created: 2015-09-09
Location: Summerside, Prince Edward Island, Canada
We are extremely happy with our heat pump. It is the Mitsubishi Mr Slim. I would recommend, as it worked flawlessly through the worst winter we have ever seen. The A/C works great also. They installed it in an afternoon, did a neat and tidy job. I would recommend this unit, the Mitsubishi Mr. Slim 1200.
Date created: 2015-08-27
Location: Costa Mesa, CA
"Keeps me warm and cozy at night"
I have owned this pump for over a year now and it has never let me down. It was easy to install but my son is a contractor so I guess that's kind of cheating. It's easy to use once installed and integrated, the only thing I don't like about it is that sometimes it would shut off before it reached the temperature that I thought was what I set it for but I really don't know. I have not had to have it repaired or replaced since I bought it but I have a warranty on it so I'm not too worried about that either. I would for sure buy the same model and brand again if I had the option. It does what it is supposed to do, nothing more, nothing less. My advice to people looking to get the best deal is to shop around online and see if any companies will price match or are willing to negotiate. When installing, make sure you do it correctly otherwise you could run into some major issues as I have read in some other online reviews.
Date created: 2015-04-13
Name: Burton Crawford
Location: Middletown, DE
"MUZ-FE18 compressor failure"
MSZ-FE18, MUZ-FE18 was installed in August/September of 2013 by a Mitsubishi Diamond Contractor. Had a problem a few months ago and after changing batteries, resting and power cycle unit, it worked. It just went out again and inside unit blinks 5 times. I had another Diamond dealer come out and they said the compressor is bad and labor is $1175.00 to replace the compressor. The dealer also said they have had a few failures of compressors after 6 months of the same unit that they had to eat the labor on. Mitsubishi should at least pay part of the cost of labor for this as the unit cost me $4800.00 to install 1-1/2 years ago.
Date created: 2015-04-09
Name: Daniel Lewis
Location: United States
"Stupid replacement filters"
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.
Date created: 2015-04-08
Name: Robert Fallin
Location: Richmond, VA
"mitz first winter"
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!
Date created: 2015-02-04
Name: Dustin Lema
Location: Seacoast, NH
"Don't believe the lies"
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.
Date created: 2014-12-09
Name: B Cyburt
Location: United States
"Mr. Slim heat pump nightmare."
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.
Date created: 2014-11-11
Name: Ryan Murphy
Location: Greenwich, CT
"Do not purchase these units for heating"
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.
Date created: 2014-09-17
Location: Eastern MA
"Freezing in September!"
It is currently 59 degrees inside. I put the unit on 1.5 hours ago and set it to 70 degrees. Well, it is still 59 degrees! The blower comes on every 10 minutes or so for 30 seconds and stops. This is how it ran all last year - barely affecting the temperature in the room! I have the heat mode selected, the fan at high and fan/vane set appropriately. I hate this thing! The floor is always cold (hard wood). Even in mildly cool temperatures it doesn't seem to be able to keep up, never mind when it's in the teens! Worst heating/cooling equipment I've encountered. Would not recommend this unit to anyone!
Date created: 2014-07-30
Name: S Politz
Location: Brazil, IN
"Parts hard to get"
Unit quit a little over 3 years. Hole in coil-no warranty. Replaced coil still didn't work. Needed compressor. Was covered by warranty but wrong compressor was delivered. Finally, after 4 mos. And $1800, unit is working again. Be aware you cannot order parts yourself. You must use a dealer. Small plastic clip on inside unit cover broke. The clip is small and pops out. I tried to order new clip but was told I had to replace the entire cover for $248. Can't order parts online. Check it out yourself. Mitsubishi only works through dealers.
Date created: 2014-06-25
Name: Jim Evergates
Location: Clinton MA
Bought 2 Mr Slims. A 12000 BTU, and a FE18000 BTU on 08/2013. My FE18000 gave great air conditioning for a month or two. When it got cold out, we ran it constantly, and it worked great until the temps dropped below freezing. My electric bills tripled and I was still running my furnace. After 5 months of service calls it finally quit. Mitsubishi put a new outside unit in.They had reprogrammed the inside unit to the old compressor with a tool that even they did not know what it would do. Finally, a letter came saying they were aware of a problem with the fe18 and would work with us on a resolution. 6 months later and they will not answer e-mails or return calls. I was told that there is a problem and a fix coming on all FE18s for 2 months now. Still no resolution. I believe that there are enough bad FE18s out there to warrant a class action lawsuit. Customer service says to get in touch with them.They forgot to tell you not to expect an answer.
Date created: 2014-03-13
Location: Ottawa, Ontario
"Mitsubishi FE12na cold weather performance"
I've had the Mitsubishi FE12na installed for only 2 weeks now but love it so far. 1600 sf bungalow. It has been able to keep 75% of the house at desired 22 deg c and the remaining distant rooms at 17 deg c at -22 c outdoor temps. Last night we had -16 with -32 windchill and it was producing 45 c air on Hi fan. I don't think I'll see -26 air temps this year to test it's lowest rated operating temp. Remember that as these units achieve better cold weather performance their over performance goes up as well including A/C.
Date created: 2014-02-01
Location: Lake of the Ozarks, MO USA
"Forth & coldest winter on Mr. Slim only."
Installed in 2010, there are two msz-fe12 and a fe09 as the sole hvac in our 1500 ft. House located in central Missouri. With temps dropping as low as -12f in Jan 2014, I was shocked they handled the load to maintain 69-71f. No service required ever except to clean inside blower wheel and add cut Filtrette hammock media over the washable filters for better dust capture. Used about 1700kwh total in January with all electric utilities.
Date created: 2013-11-19
"Compressor Bad After Using One Winter"
Bought Mr. Slim in June of 2012. $6500 used winter of 12-13. Went to use it last week and it didn't work. Was told the compressor went out. It's under warranty but labor and shipping will cost us $900?? We don't feel we should be out anything for a bad compressor that's only a year and a half old and used just one winter. Plus, it's getting cold and we were told it can take up to 10 days to get here! Will not be buying another!
Date created: 2013-01-23
Name: Jeff Innis
Location: Grants Pass, Oregon
I've had the Mitsu fe12na for two years now, and am fairly impressed with it. It replaces my old wall heaters quite well. I find it interesting reading some of the reviews complaining about lack of heat at low temps. Mine puts out good heat even down in the low teens. If these reviewers had bothered to read the literature, they would see that there is a significant drop off in efficiency when you drop below say 15 degrees ( and the hyper heat kicks in ). I've had no service issues to date, but I do have a couple of complaints. First, the unit tends to ice up the base drainage tray when the temps are below freezing (and humidity is high), for several days in a row. It doesn't appear to impact the units operation. There is an optional base heater kit that is supposed to eliminate this issue. The other complaint is the fan on the outdoor unit is rather loud at times. I would guess that both of these issues are common to heat pumps to at least some degree. All in all very satisfied.
Date created: 2011-06-15
Location: Richmond, VA
"Heat Pump Very Satisfactory"
I have owned my heating pump for about a year now. I have yet to have any problems or dealt with any breakdowns. There have been no leaks or anything of that nature either. So far I love it and no complaints. Being that I have only had it for about a year, I have not had to repair it. I would definitely buy this brand again. Our last heat pump constantly had problems and my wife would always complain about it so I decided that I would try Mitsubishi because one of my friends recommended it and I can honestly say that I am more than satisfied. It did not make very much noise at all. Furthermore, it had wireless controllers. I would recommend to anyone interested. It required no ductwork and even ran better than some of the wall air-conditioners and that I've had in the past! Great buy!
Other Mr. Slim Reviews
Comments on the Mr. Slim heat pump are generally positive. A consumer comment on inspectorsjournal.com 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.