The MRCOOL Configurator: Configurate the Right System for Your Comfort

  • June 29, 2022
  • By MR COOL

It can be an easy decision to update your old HVAC system – especially if it doesn’t work properly. If you’ve decided to get a new heating and cooling system, you know that the real problem comes after. How do you decide what system to choose in the sea of HVAC products? We might be able to help with that, thanks to our MRCOOL Configurator Tool!

This tool is the key to planning out how the DIY MRCOOL Mini-Split system works in your home. It’s able to help you decide how many zones you want to heat and cool. It’ll also show you the general sizes that various units are typically able to cover. Let’s walk through it.

When you reach the MRCOOL home page, scroll down a little. The configurator should be located about midway down the main page. You’ll see a phrase in brackets that says “Configure Your 3rd Gen MRCOOL® DIY® System.” Click on that, and a window will pop up.

The next step is easy. Just choose the number of zones you want to heat and cool. If you need something like three small bedrooms cooled and heated, select the 2-3 zone option. This selects the 27k BTU condenser. When you click this option, the window will change, and you’ll be able to select the air handlers you need.

When it comes to this specific condenser, the 27k BTU unit, you can choose air handlers that equal up to a 36k BTU capacity, but you cannot have less than 18k BTUs, because the system needs to meet a certain BTU capacity to function appropriately. You will also need to choose at least two air handlers. If you just need one air handler, then you can find sizing for the single-zone systems on the previous window.

The 27k BTU condenser is compatible with a 9k BTU air handler that typically covers around 375 square feet, a 12k BTU air handler that can handle about 350-550 square feet, and an 18k BTU air handler that’s equipped to cover around 550-800 square feet. Remember that choosing the right system might depend on a number of outside factors, including the climate you live in, the quality of your space’s insulation, and the amount of sun exposure your space receives.

Once you select the air handlers you need, it’s time to move on to choosing your line sets! The 27k BTU condenser’s maximum overall line set length is 197 feet, but the maximum line set length per air handler is 75 feet. You’ll need to choose a line set for each air handler that you have, and the lengths you can choose are 16 feet, 25 feet, 50 feet, and 75 feet. The latter two lengths are actually a combination of line sets, as the only increments of pre-charged line sets we offer are 16 feet and 25 feet! The 50 foot and 75 foot selections will include additional line sets and Quick Connect coupler kits, which allow you to link two pre-charged line set per coupler kit!

Once you’ve decided on the line sets you want, move on to the next page, and you’ll receive the model number of the system you created! This page also features the model numbers for every component in the bundle. You can copy this model number, as well as the list of items that make up the bundle, so that you can find the exact system you need!

Using the MRCOOL Configurator can be the first step in clarifying what our multi-zone DIY ductless mini-split systems can do, and it helps you decide what you need. The configurator can help you achieve complete comfort with the click of a button!

42 thoughts on “The MRCOOL Configurator: Configurate the Right System for Your Comfort”

  1. Hello is there any significant difference between the 27btu ; 24btu units
    I want to buy the gen 4th But I’m confused about the minimum but required for the 27btu condenser unit the article explains that it requires at least half the btu’s for the unit to work correctly so a 24btu condenser has to have 1one 12btu handler on which is half the but running, but what about
    The 27BTUS condenser unit,, it has to have a 12kBtu and a 9k but running constantly in order to work properly,,,a 27kBTU condenser Can’t be running just a 9kbtu unit because it requires at least half of the btu’s so at least a 12kbtu plus a 9kbtu has to be on and running at all times for the 27kbtu condenser unit to have at least half of the required btus???
    What’s the minimum btus required for th 27kbtu condenser unit?

    1. The 24k BTU DIY ductless mini-split system is NOT a multi-zone system. The only air handler that it is compatible with is a 24k BTU air handler. That is correct for the 27k BTU system. It will not function properly if just a 9k air handler is connected and operating, as that does not reach half of the condenser’s capacity. You will need to have at least 13.5k BTUs running for the 27k BTU condenser.

      1. The previous information makes no sense at all.
        First of all why does Mrcool Not have a DIY 24kBTU condenser unit that’s multy zone capable of cooling 2 rooms,,,
        A 12kBTU handler in one room an a second 12kBTu handler in another room equals 24k it does not equal 27.
        Secondly if I buy a 27kBTU MULTIZONE condenser unit with a 9kBTU handler for one room & a 18kBTU handler for a second room that equals 27kBTU…but…
        Acording to the previous statement I WONT be able to run & cool just one room with the 9kBTU handler because it does NOT have the 13.5k btu (OR HALF) that is required,,,
        And neighter would it be sufficient to run & cool just one room with the 12kBTU handler because HALF of 27k is 13.5 and there are NO 13.5kBTU available,,,only 9k, 12,k and 18k
        So the must simple solution would be to make a 24kBTU DIY multy Zone with a 12K & 12kBTU which equal 24_BTU available for sale.
        Why would I buy a 27kBTU condenser unit with a 9k and 12k (handlers) if I won’t be able to run neighter one just by them selfs..then I would have to buy a 9k & 18k (handlers) and I still run into the same problem…unable to run just the 9k due to lack of insufficient BTU’s …which is half,,,which is 13,5k…

        1. The 27k BTU DIY multi-zone mini-split system CAN accommodate two 12k BTU air handlers. We do NOT have a multi-zone 24k BTU condenser. Since our only 24k BTU condenser is a single-zone, it is only compatible with a 24k BTU air handler. We apologize for any inconvenience, but we do not make a 24k BTU multi-zone condenser.

  2. I want to buy a 36 K condenser that will be hooked up to 2 air handlers, an 18K and a 24K. As I understand the system I will be able to run the system at times with only the 18K running. Is this true?

  3. You mentioned about Mr Cool Configurator but didn’t put the link. It says somewhere around halfway of the homepage but I can’t see it anywhere.

    1. There is not a link to it, because it opens a window on the home page. On our home page, there is a bracket with the quote “Configure Your 3rd Gen MRCOOL DIY System, 4th Gen Configurator Coming Soon” just above the middle of the page if you’re scrolling down.

  4. We are looking to replace an existing 12000 BTU unit with a 4th Generation MrCool DIY unit. Service power though on existing unit is 230V rather than 115V. Is a 230V 4th Generation 12000 unit available? Recommendations?

  5. I am looking to replace my old package unit with a new system. My package unit is a gas furnace 60,000 and air is 3 ton. I have been considering a split unit ( I am tired of the old package unit taking up so much space) and it replaced a split unit. I am also intrested in a duel fuel unit of the same spec’s. Can you give me a price of a duel split system and the price of a heat pump split system. So I can compare the prices of both. I already have an installer. I want a price on a complete everything ready to install price. I will need a 50 ft line set.

  6. Can a unit be too big for a space? I have about 340sq.ft. I need to condition and was looking at a 12k system but the selector indicates a 9k system. Will a 12k be an improvement or will it cycle too much to control humidity?

    1. While a unit can be too large for a space, the 12k may work for this space, especially if it is set to a lower fan speed and a slightly higher temperature. Factors such as climate, insulation, number of windows, number of people, sun exposure, and a number of other variables also affect the size you need.

  7. I have a typical cape cod home which is 26 ×44 ft. I really think I should put the air handler in the center of the house which puts it on an inside wall. Also a small air handler in the bedroom on the first floor. Is this doable ?

    1. If you want one air handler to heat and cool the entire space, you may want to go with a dual zone system that has a 36k BTU condenser, a 24k BTU air handler to put in the center of the house, and a 9k BTU air handler to put in the bedroom. However, all of the doors in your house will need to be open, or the entire space open concept in order for the 24k BTU air handler to appropriately cool those spaces. A 24k BTU air handler can typically handle around 1,000 square feet, and a 9k can handle around 350 square feet. Keep in mind that climate, insulation level, sun exposure, number of people in your home, and a variety of other factors can also affect the size you need.

  8. I have a 100-year-old brick Duplex “Twin” house with a living-room (15×15) and dining-room (15×15) that have a wide opening between both rooms, then a small door going to the kitchen (15×10).
    Stairway from the corner of dining-room facing side wall of house goes up to hallway (20feet) of the three separate bedrooms (Master bedroom 15×15-Middle bedroom 12×10-backbedroom 10×10), and the full bathroom (10×6). In the small bedroom, the is a stairway going to an attic I want to make into a fourth bedroom (40×12) with a slanted ceiling. I would imagine I could use only a one unit in the Dinning-room and Living-room…
    Cut an upper ventilation hole with vent for the middle room and hallway, as well as cut an upper ventilation hole for the back bedroom and 2nd floor bathroom.
    What kind of a MRCOOL system would I need and how many inside units per room spaces?

    1. You may want an HVAC professional’s assistance to assist you with sizing the right system for your home, as many factors can affect the sizes you need. This being said, it sounds like you’d need a 12k air handler for the living and dining rooms, then a 9k for the kitchen. You could have a 9k in each of the bedrooms, except for the attic. That space would likely need a 12k unit. You could likely do this all with multi-zone systems. You could have a multi-zone condenser to handle all of the air handlers going to a bedroom, then a multi-zone condenser to handle the kitchen, dining room, living room, and maybe even the attic. There are many options for sizing a system for your house, and this is all if you want to heat and cool your house entirely with a mini-split!

  9. Can a unit be too big for a space? I have about 340sq.ft. I need to condition and was looking at a 12k system but the selector indicates a 9k system. Will a 12k be an improvement or will it cycle too much to control humidity?

    1. While a unit can be too large for a space, the 12k may work for this space, especially if it is set to a lower fan speed and a slightly higher temperature. Factors such as climate, insulation, number of windows, number of people, sun exposure, and a number of other variables also affect the size you need.

  10. I am in the process of building a 30′ X 50′ shop, it will be open with no walls inside. And I am looking to cool and heat it, it’s located in Coastal NC, near Morehead City NC. We get very little snow, but fairly warm summers. What system would yo recommend.

    1. Depending on the height of the ceiling and the level of insulation, you might find that the 36k BTU DIY ductless mini-split could work, as it can typically handle spaces around 1,500 square feet. If you think this is too small, you may want to get two smaller units, like a 24k and an 18k BTU unit.

  11. How much energy in kWh does your 2 and 3 zone unit use during operation? What are the electrical wiring requirements,

    1. It greatly depends on what air handlers you have connected to the system. The 18k BTU 2 zone condenser is a 25A, 208-230V unit, and the 27k 3 zone condenser is a 40A, 208-230V unit.

  12. I have a three bedroom one floor ranch home with approximately 1250 square feet. The ceilings are 8 feet with 4 inch wall and 9 inch ceiling insulation. I was wondering if a 24K DIY24HP230B25MS mounted on one end of an interior wall would be sufficient to cool the house. I plan on one handler. Thanks in advance.

  13. I have a well insulated home with ductwork installed to all rooms. It is 2200 square feet. Will the 2-3 ton universal heat pump system work for me?

  14. So I have old duct work , if i went with a new package system i would /should replace it . That is an expense i would rather not have. How many air handlers do I need to comfortably/ evenly cool a 1500 sq foot house. Sorry this isnt my forte so I would honestly appreciate your feedback. I presume if i was to go with the Mr cool system the mini split would replace my package in that ot offers cool and warm.. Thanks seems like yall have an awesome product from the reviews i have read., and you are an AMERICAN company !!

    1. It would likely depend on how many different spaces you have to heat and cool. For example, if you have a bedroom near your living room, and the door to the bedroom is shut often, we would recommend that you get an air handler for the living room and for the bedroom. The Configurator is a wonderful tool for figuring out what system you need in your home, and can be found on our main page or any page with a DIY® product on it!

  15. Hi,
    If i install a 27k btu condenser and (2) 12k btu air handlers ( in 2 separate rooms) would I be able to run just 1 of air handlers at a time if I wanted to? Or would it not operate efficiently (or at all?) because it is not operating at 13.5K btus ( 1/2 of the condensers BTU capacity)

    1. With updated specs, the recommended operating BTU minimum is now 20k BTUs. Operating it under this BTU capacity would yield inefficient results and potentially negatively affect the operation of the system.

  16. Is it possible to get a 27k 3 zone condenser with two air handlers initially, say 2 – 9 k air handlers and have the option for future expansion if necessary? Also, do the air handlers require separate electrical connections or are they powered from the electrical line for the condenser?

    1. That is possible, but at least 20k BTUs must be operating in order for the system to function appropriately. The air handlers get their power from the condenser.

  17. Hello, I’m considering building a new house, mostly one level about 3,300 square feet. And I was reading some of the questions and answered, it seems the understanding that one unit with several air handlers really can’t officially operate efficiently one at a time. In my reading that correctly.
    For example one unit with three handlers, one for each bedroom can’t officially run by itself, is that correct? is that way I understand it. ?
    That these units are good for larger area where you have multiple handles. Like a open area where you have kitchen living room and dining room.
    Also For example what would you use for three bedrooms, having one unit with three handlers . a handlers for each one of those room. what BTU could officially run the handler separately?.

    1. You need to have at least 2/3rds capacity of the condenser operating at a time, so if you put three equally sized air handlers in three separate spaces, you could not operate just one at a time. These are still great options for three separate spaces, though! We can’t really make a recommendation on size without knowing more information about your home, but you might find our configurator located in the middle of our home page helpful in deciding on a size!

    1. The line set will come out of the right side of the air handler when you are looking at it from the front. It cannot come out of the left side of the unit, but it can come out of the side because the casing has knockouts.

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