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Introducing the New MRCOOL Smart Controller & App!

Happy January, and welcome to 2019! More importantly, welcome to the new MRCOOL Smart Controller, the best wireless control system for any ductless mini-split heat pump system ever made (so far!).

What’s a MRCOOL Smart Controller?

The MRCOOL Smart Controller is our new wireless control system that integrates with your smartphone and/or other smart-home devices. Which ones? The SmartHVAC app is compatible with both Alexa and Google Assistant. We also anticipate integrating the app with additional home systems in the near future.

Yeah, sure, all that compatibility is great, but what does this thing do?

Well, I’m glad you asked.

Amazing MRCOOL Smart Controller Kit Features!

  • Global Control – Control your MRCOOL air conditioner or heat pump via your smartphone from anywhere in the world.
  • Weekly Scheduling – Powerful 7 day scheduling functionality helps you schedule your air comfort as per desired settings and time.
  • Filter Maintenance Reminder – Because changing the filter is important, and you don’t need to keep forgetting.
  • Geo Fencing – Automatically turn your ductless unit on before you arrive and switch the system off automatically after you have left the premises.
  • Zone Control  – Create dedicated air comfort zones. Single touch control for all home systems by creating zones.
  • Usage Statistics – Keep track of your heating or cooling usage to control your electricity costs. Save energy, save money, live free, etc. 
  • Timeline of Actions – Check a complete timeline of actions of your AC. Check who is using your AC, what settings are being used and when.

Awesome, right?

Who wouldn’t want all those tools to get the very most out of their brand new MRCOOL ductless mini-split heat pump system? And we use that term generally, because the Smart Controller will work seamlessly with all current generation ductless mini-splits that we make. To learn more, but a new MRCOOL unit that includes the Smart Controller or buy a new Smart Controller kit from your favorite dealer!

Download the MRCOOL SmartHVAC App for Google Play here. Or here on the App Store.

156 thoughts on “Introducing the New MRCOOL Smart Controller & App!”

  1. Certainly hope you provide an update link for existing wifi dongles – download and update the files on the usb key. That would be the right thing to do.

    1. MrCool is an excellent product. It proved itself during our California summer HOWEVER, THE UNIT INCLUDED with the HVAC unit leaves a lot to desired.
      Firstly – do not adhere to the instructions included with the unit.
      Secondly – the item that refers to the Bar Code which supposedly is included really is not included as per the company’s SUPPORT.
      THIRDLY: the instructions which are found in the DONGLE box are something to be desired. AND. in my opinion are senseless

      IBM CLAIMED: The instruction booklets were more important than the actual program itself. However who knows IBM today

      1. I believe you’re referencing the Smart Controller unit. It does not need a bar code. A bar code is required for the MRCOOL app, but not the Smart Controller. If you use the Smart Controller, you need to use the SmartHVAC app.

        1. The app is working great on my unit but when I try to connect to Google Home the thermostat doesn’t show up . How can I get it to connect to Google Home ?

  2. Too bad i gave my nest away. I was under the impression the ability to integrate with nest wasn’t being looked at. Good to see though! Is there an indication how much and possibly a video showing replacing the current wifi dongle, on a DIY version of the MR COOL? Will the added capability be up loaded thru wifi to the new controller. How about a discount for those of use that bought the original wifi controller?


    1. Integration with Nest is something we’ve wanted to do for a long time, and everything looks good for it finally rolling out this year w/the new Smart Controller. We will have an install and set-up video coming soon. Yes, the Nest capability should come through as an update for the Smart Controller. As you know, we don’t sell direct, but we are talking to dealers on discounted pricing for upgrading customers.

  3. “or buy a new Smart Controller kit from your favorite dealer!” Hmmm, I just did a deep net search and found no one offering this product. I searched by dealer “Lowes” (where I bought my 18k unit) and they haven’t heard of it. Can you offer some links that we can use to buy this amazing upgrade to my existing unit?

  4. Just to reconfirm. You state that this will work will ALL current units. That includes the Olympus series as well? Before I was told no wifi on that series.

    1. All newly manufactured air handlers have a docking station in them. Previous Olympus models did not all have, so they could not use a wireless module. The Smart Controller will work with 2019 Olympus units (or existing Olympus systems that have air handlers w/a docking station in the air handler).

      1. Okay, Thank you. I went ahead and ordered three of these for my Olympus multi zone system. All installed and working well. Still working out the kinks with voice control through google assistant. Also mine would not hook up 5Ghz wifi (802.11AC) it would only hook up to 2.4Ghz wifi (802.11n). Just an FYI.

      2. I just purchased 3 of the new smart WiFi adapters for my late 2018 model Olympus Tri-zone (9k, 12k, 12k) system which include air handlers w/ docking stations and the previous model WiFi adapters (which worked great). The new adapters do not function in either of the 12k units and return a P7 error when placed in “AP” mode. All of the adapters work fine and register in the 9k unit. Is there a firmware update available for the 12k units that will resolve this issue?

  5. We need a contact number to set up our warranty. The link provided does NOT work and we’ve tried doing it on multiple devices.

    1. We migrated our server this week, so that may have caused the issue. You can call 270-366-0457 to register your warranty.

      1. I just purchased the new smart controller kit to replace the older kit that came with my DIY system I just purchased less than a year ago. I was very disappointed when I just hooked it up and find it does not see 5g wireless as this was the main reason for replacement.

          1. Ok thanks. Disappointed with that, but I do like the new scheduling feature so that makes up for it. Thanks again

  6. Any instructions on how to get this to work with Alexa? I’ve tried everything. Most I can do it turn my unit on and off with Alexa. For some reason the amazon Alexa up recognizes the unit as a lamp. What skill do I need to download?

  7. Having problems with the app on my galaxy note8. After log in, any button I push just says “time out”. Feels like I’m a toddler again haha. Seriously though, is there a fix?

  8. Where would I go to find more info on how the dehumidification mode on my new 24K Heatpump works?? The remote user guide just says temperature set points are used??? Isn’t the unit supposed to be controlling RH (relative humidity)??

    1. All air conditioners and heat pumps automatically reduce humidity as a normal byproduct of their cooling function. You can set the unit to dry mode to increase dehumidification if the interior is particularly humid.

        1. When you activate any air conditioner or heat pump in cooling mode, it dehumidifies the environment as a byproduct of its operating cycle. However, air conditioners and heat pumps, especially mini-splits, are not typically designed to deliver the kind of humidity control you seem to be wanting.

  9. Hi. Will you make it a priority to post at least monthly the status of offering different lineset lengths. I’m remodeling and would like to install a 36k in the early fall. I have the 18k in my garage. Surprised it worked fine at -5 degree temps this winter. Also, please address the interior fan bearing noise. It is noticeable and the only issue to criticize on the mini splits.

    1. It is very difficult to post updates on products that are in development and do not yet have a release date.

      As far as the fan bearing noise, the interior air handler should be running very quietly. Give our tech support a call at 270-366-0457.

  10. Do all 2nd gen DIY units come with this new controller? Costco sells 2nd gen units, and I want to be sure that I don’t have to buy another part for above-mentioned functionality to work.

    1. All ductless products from all dealers will include the Smart Controller by 1 May 2019. Smart Controllers are available separately for purchase until that time.

  11. I have a central unit inverter Mr cool, do you have any smart thermostat avaailable for this unit ( 18 seer system)

  12. What the difference between the DIY-24-HP-230A and DIY-24-HP-230AE? I have been looking on Lowe’s and Home depot website but they only list the DIY-24-HP-230A not the DIY-24-HP-230 AE. Is the DIY-24-HP-230A 1st Gen and DIY-24-HP-230AE is the 2nd Gen Enhanced. What make makes it Enhanced? Where can I get the DIY-24-HP-230AE?

    1. The AE models feature the new Smart Controller. Most dealers should be listing products by the end of the month.

  13. Hi, just wanted to know if there is a discount for those who bought air conditioners before the new dongle came out. I bought my mini split less than a year ago from Amazon and would love to have the ability to control it through my Google home. I don’t think it’s reasonable to have to pay $40 for a usb stick. Thanks.

    1. The price of the new units is higher than the price of previous generation products to accommodate the increased cost of the new Smart Controller. That being said, dealers may offer discounts for the Smart Controller to previous customers at the dealers discretion.

  14. I’m confused. I have a 1.5 year old DIY unit with the USB stick that works remotely from my iPhone app. What does this new enhanced thing do that I can’t currently do?

    1. The previous generation WiFi app is not compatible with Alexa or Google Assistant. Otherwise the functionality is very similar.

  15. I am considering a 24k Mr. Cool Mini Split. Is the only difference between the 3rd generation Advantage and the 2nd Gen Enhanced is that the Enhanced is DIY and comes with a pre-charged line set? I am thinking of going with the Advantage and having a technician help me get the line set the correct length. I would like to avoid coiling extra. I am assuming you still do not have various lengths of pre-charged line set.

    1. You are correct on all counts. The Advantage is not DIY and we do not have various lengths of pre-charged line.

  16. Just finished installing the wi-fi kit and mobile app on my 18K DIY unit. Functions work as normal and I can control the unit via the app. When I go into check mode, I get a 4042: control failed message. Please advise on what this means and how to resolve. Thanks.

  17. So my original wifi kit no longer work?
    You just stopped supporting them and we have to buy a new one?

    1. Your original wifi kit is still working and is still being supported. You do not have to purchase the new Smart Controller.

  18. I installed my 12k DIY System this past Friday but I cannot get the app to connect to the system. I didn’t receive any QR Codes, I searched everywhere for them and when I try with the manual mode I can see the smartvac listed in the list of WLAN connections on my device but when I connect to it the app does nothing.

    1. I have the exact same problem. I did not receive any QR codes with my device. Tech Support does not answer their phone/e-mails and does not return calls when messages are left.

      Did you ever get this working? If so, how?

    2. I figured mine out. Try using the SmartHVAC app instead of the MrCool Remote app. I switched to this app and got it to work.

    1. Hey Chris, use the “Cielo Smart Home” under works with google in the Home Assistant app. Worked like a charm for me.

  19. Hello, I ordered the DIY Mr Cool 18K and it was delivered today when I was not at home. However, when UPS delivered it, they left it on its side (even though the package says it must be upright) – I have left it currently where they delivered it. (Both parts were delivered on their side) Is the unit now damaged? Can it be used if but back upright? Is it still covered by warrantee? What should I do at this point?

    1. It should still be covered by warranty. You should inspect it for shipping damage. You should set the product upright and leave it upright for 12 hours or so before installing. Provided you don’t find any damage and you let it settle for a bit, it should be fine to install and you shouldn’t have any problems.

  20. Hello Mr. Cool,
    We have 4 mini splits and are eager to buy new smart controllers for all of them if and when the Nest integration comes out. We have a Nest but have not installed it.
    I read “Q3 2019” is when the update is coming out, do you have a new rough estimate to when the update is coming?
    Also: Do you have a link to where I can purchase these?
    PS. as a software engineer and tinkerer: I would love to see an API & documentation for your units
    Thank you

    1. We do not have an update at this time for Nest integration. We do not sell Smart Controllers (or any product) directly. You can buy the Smart Controller directly at online retailers like IWAE and others. If the API and documentation is available, our tech department could help you with that (270-366-0457).

  21. Can only one person in the household use the Smart HVAC app to control the unit? I downloaded it and it works fine, but then my boyfriend downloaded it, set up his own user name, etc… but then it kicks me off. I have to sync the app back to the unit, but then it kicks HIM off. That’s weird.

      1. Okay, I also can’t get it to work with Alexa. It did at first and now I don’t know what happened. I had to remove device and reconnect to wifi, and now Alexa doesn’t recognize the system as being on the network, even though it is. I don’t understand. It’s been very finicky.

  22. Hi, I have no complaints at this time except for UPS delivery. I received both 18k units today and have camera footage of them having the units stacked on end and manhandling them as they took them off of the delivery truck. The driver was very agitated with my wife. I will send photos of the packages (3 obviously manhandled) to ensure Mr. Cool has evidence to stand on when discussing delivery requirements for products sensitive to handling and storage. I am hoping that the well thought out packaging was able to protect my new units adequately.

    1. We’re sorry you had a bad experience with the delivery. However, you should really contact the dealer who sold you the MRCOOL product. We don’t sell directly to consumers. Our dealers and distributors are responsible for any necessary shipping.

  23. I have the USB dongles I bought last year for the Advantage I also bought last year. Earlier this year the new app came out and I had to delete the units out of the app and reinstall. Was working pretty good until June-2-19? Both of the units say OFFLINE? Did the app do an update that will require deleting the units again and reinstalling? No matter which app I have used you can not switch between heat and cool mode? It appears a server some where must be storing these connections and if the server goes down so does all the connections? Is this true?

      1. One reason they provided was that in case the line is damaged and needs to be repaired, the copper allows for a relatively easy repair compared to other materials.

  24. Hello. I just bought a third gen diy 24000 and tried to use the smart controller but after I put it in AP mode error code p7 flashed up. I received another smart controller,but the same thing is happening and I cannot connect to the mini split wifi.

    1. If you use the Silent Mode (by pushing the LED button to turn off the LED) on the remote, it should not beep when you use the Smart Controller. However, be aware, that if you turn the unit off and on again, you will have to activate Silent Mode again.

  25. Great job Mr Cool! I called the customer support line and was treated very professionally. My problem was resolved by simply tightening a loose connection for the smart controller plug. Thank you very much!

  26. Just got my Mrcool Diy 24k installed. Was very excited to install the smartcontroller but after following directions and getting smarthvac app, the smartcontroller does not show up as Wifi device. Very frustrated with which should be the least frustrating part of the intall. Trying to find a customer service line but unsuccessful.

  27. I am looking at purchasing the MRCOOL Comfort Made Simple DIY units for a shed in my back yard. The wifi connection from my house does not reach out to my shed. Will that make using the wifi/app controlled feature useless, or does the wifi dongle create its own signal?

  28. I just installed an 18k DIY unit. I am trying to get the app to work. I put the unit in AP mode and it creates a “Smart_AC_XXXX” access point. I run the app but it is looking for a network with the SSID of “Net_AC_XXXX” The app will not continue with the registration of a new unit since it thinks the phone is not connected to the WIFI signal of the unit. My USB dongle did not come with any QR codes so I am forced to use the manual install method.

    I have tried to call tech support many times. I have left multiple messages without response. I have sent emails. Nobody has responded to any call or email I have sent.

    Can ANYONE tell me how to get this working? It is a brand new unit, purchased from Home Depot, installed within the last month.

    1. Tom, it looks like you got it working. However, you can always call tech support at 270-366-0457 for help when needed.

  29. Hello, I just purchased the 18k unit from Costco June 28,2019. It says it’s a Gen 2 but the wifi box that it came with is all white and reads “ MRCOOL Smart Kit Master Cade Pack 1pcs”. Is this the same as the Smart Controller enhances WiFi dongle?? I believe I was sent the wrong one.

    1. Call us at 270-366-0457. If for some reason you received the incorrect smart device, we will immediately ship you a replacement.

  30. I thought that might be the case, but the 4 app positions do not move the louvers at all. It beeps, but the louvers stay in the same position. The remote controller that came with the unit will move the louvers just fine, but not the app. The other functions on the SmartHVAC App are working just fine (cool, fan, temp., fan speed, etc.). Any thoughts?


  31. I just installed a 12k DIY unit from Costco. Works good.
    WiFi controller has issues. Does not work with Alexa. Louver position does nothing (unit beeps but not changing position). Fan speed changes are not synchronized with remote.
    Web site has a link to the wrong controller manual.

  32. After the latest smartHvac app update the schedule is no longer working, also Alexa can no longer connect with the unit. Is a fix coming any time soon or somewhere I can download an older app version?

  33. Just installed a new MrCool 18K unit. Seems to work just fine. But am unable to create a schedule that works. The user interface is very un-intuitive. I’ve tried and tried, but when I create a schedule and ‘put it into action’, nothing happens on the unit. I called the number that’s been posted in this blog several times and had to leave a message, but have received no callback. Is there any documentation for this app?

  34. To anyone having trouble installing this, download the SmartHVAC app. My device was not showing the net_ac network like the Mr. Cool app said. I downloaded the SmartHVAC app and it installed nice and easy.

    1. Nest integration is still on the docket. Progress was pushed back on development due to recent changes with Nest software.

  35. The basic control functionality of this works great. Some points: (1) put the instruction ‘manual’ on the top of the dongle, not hidden at the bottom of the box (2) the history function, unless there’s something I’m missing, is basically worthless because the fans runs all of the time and the app appears to interpret this as the compressor is running (3) maybe I’m dense, but the scheduling part of this app isn’t very intuitive and (4) it would really be nice if Mr Cool integrated an internal power meter so you could totalize the amount of kilowatts used.

    1. I’m installing my second 18k advantage unit and agree with Jeff on all points and will add to them:

      2&4) history definitely needs to relate to compressor running not just if the unit it on / off otherwise the graph is useless as it just shows Off and On. Likewise, is the temp graph showing room temp or my desired temp setting? Ex: room is 78 but setting is 68..

      While we are making suggestions to improve the product even more I have a few and will number them in addition to Jeff’s 1-4

      5) since the line set control wires are same length as the 16ft copper set they end up shorter due to the fact the unit itself has built-in 3ft or so of copper lines. The control wires supplied need to be longer or, like me, my copper is perfect and my control wires are too short.

      6) the usb dingle needs a simple sticker/label indicating which side faces out and the instructions would not have to go into detail on what side is facing out.

      7) Nest – the main reason I got MrCool was for eventual nest integration, I would like to know the basics now so I could at least plan for it while I’m installing these units as they are replacing ac units already controlled by nest integrated into my smart home automation system. Ex: how will the nests need to be wired so I could have wire already run. I’m getting impatient as the app is nice but Nest already works with my smartthings home and provides much better wall control for everyone without an app, especially at night. I want to not depend upon the remote control and put it away as I’m certainly not mounting the remote nest to my nest thermostat. I’m patiently-impatient to get nest going.. Please contact me and I’d love to help beta test.

      8) not all remote features are in the app, would be great if I could “schedule” the LED to turn off at night, turbo mode, etc.

      Keep up the great work!

  36. I keep getting notifications from the app that “Swing changed to Pos3 via Remote Control”, “Mode changed to Auto via Remote Control” or “changed temperature to XX via Remote Control”..\

    There is no remote control to change anything. We took the batteries out of it after we got the app setup. I have no clue what is changing it as there are no RF or IR signals in the room this Unit is in.

  37. Have you considered making this kit available online other than iwae.com? Ingram’s could not have done any worse fulfilling and shipping my order. 2 business days to “process”, 7 days shipping time for one item that weighs less than 1 lb! To make matters worse, they put a typo in my shipping address which was actually correct on my receipt! Can you guys just sell direct on Amazon?

    1. The SmartController is available to any of our dealers that wish to sell it. We do not have any limitations on which of our products dealers may or may not sell. Many do not sell it individually, since it is included with all new products.

  38. Hello, I have been buying DIY Units (3) and installing them one by one. I have all 3 listed under my SmartHVAC App, and they can be controlled fine. But then I downloaded the same App for my son to control the same 3 units, but the app doesn’t populate the 3 already Wifi enabled units onto his app after he logs in under my account. Why is that? Please don’t tell me that each unit can only be associated with only one app? Thanks, Jeff

    1. A single unit can only be associated with a single app. However, there is a work around. Instead of using a different username and password for his app, he can just log into the app on his phone with your app username and password.

    1. You don’t need QR stickers with the SmartController. Make sure you are using the SmartHVAC app, and the setup should complete quickly.

  39. Can you please update us on the progress of the Nest integration? I’m very interested in this project, but while I’m ok with a beta I don’t buy vaporware 🤔

  40. Hi…
    Put a 12k Mr Cool in our lower bedroom that is typically freezing cold come fall/winter. It’s awesome… thanks!
    We have a Samsung SmartThings WiFi hub for other wireless gadgets in our home…Do you foresee WiFi integration with the SmartThings hub in the near future? Make it easier to control from one app…

  41. I love my Mr Cool DIY mini split but would love it even more if the full Nest integration was available. What happened with that? I am looking forward to having a scheduler that isn’t tied to my phone. The other day, I was in a different time zone and my wife at home. The set back happened in my time zone and then left her in the cold. We need a better solution! Thanks!

  42. I had my units on a schedule to start heating when my house gets coldest, however the loud beep and led kicks on and wakes people up. Anyway to disable? I’ve turned off the led via remote but any changes via the app always turn on the led with loud beep.


    1. If you always leave the unit on and set the schedule to adjust only the temperature setting, then it stays in silent mode. We use either SmartHVAC or Google Home to manage the schedule and override.

      But I agree that they should fix it to stay in silent mode even after being turned off. That is one annoying beep.

  43. Since Nest integration seems to be delayed for an unknown amount of time, is there any way to wire in a simple thermostat so that I can have it detect the temp on the other side of the room? We have a thermometer on the other side of the room and it’s always about 10-15 degrees colder than Mr Cool thinks it is (heating mode).

    Also, is the API for your smart controller published anywhere? I’m a programmer and would like to make my own custom app to control.

    1. You can’t wire it to a thermostat, but you could use Follow Me and place the remote on the other side of the room. As far as I know, the API is not published anywhere.

  44. I’ve been using the Smart Controller for a few months now with mixed results.
    Problem is that this is a server on the web that is trying to control my mini-split but I live in the majestic USA where millions of households are still not able to get reliable internet.
    I need to get my home internet connection through a cell mobile hotspot which has very spotty reception and is not stable.
    The SmartHVAC server is often failing to connect to my Smart Controller and is clearly not retrying if it fails during the 1st attempt.
    This means that quite often, my mini-split is not turned on or off as I set it up through the SmartHVAC app and is making our system as unreliable as our internet connection.

    I’m a full stack software developer. Is it possible to connect a device a like a Raspberry PI (or any other type of computer) to the mini-split USB port and develop my own local software to control my mini-split?
    I currently run 1 MrCool mini-split to test out and am hoping to install 3 more if I can get stable and reliable control over them.

    1. That’s not the sort of capability that we support. We are developing a wall-style thermostat that may provide the capability you’re looking for without the necessity of an Internet connection.

    1. The cassettes cannot integrate the Smart Controller. We are working on a thermostat-style device that will provide the same kind of capabilities for cassettes.

  45. So just installed the unit and had issues getting the SmartHVAC app to progress in the setup, it would just stall on the “connect to HVAC wifi”, even after connecting it would not go to the next step to allow me to enter my home wifi information. I was using an iPhone X, then tried on an iPhone 8Plus and it worked flawlessly. In summary, if you are having issues getting the app to setup the HVAC unit, try a different phone…hope this helps someone.

  46. Is it possible to enable Freeze Protect (FP) from the SmartHVAC app? Right now I am under the impression I have to drive up to my place, hit FP on the remote, and then head back. I would LOVE to set this remotely. It would save me a ton of time, miles, and money to have this. Maybe it’s hiding in the app and I just need a nudge. Please advise. Thanks!

      1. Same question as Mike however I am using the MRCOOL remote 3.0.20190425_01 App (Not the MrCool SmartHVAC App). First, are these Apps the same? The MRCOOL Remote app instructions seem to indicate the Freeze Protection controllability available via special functions (8DEG C heat – freeze protection).

        1. The MRCOOL remote app and the SmartHVAC app are not the same. The SmartHVAC app is the current preferred wireless control device.

          1. is the original WIFI dongle (that came with DIY-18–C-HP-230A) compatible with the newer SmartHVAC app? Does my unit require an upgrade to the new Smart Controller to be compatible with the newer SmartHVAC app to allow remote engagement of the Freeze Protection feature?

  47. Help! Trying to set up smart controller app but I keep getting P7 error code and unit doesn’t show up in list of devices to connect to.

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