The New Configurator is HERE!

  • March 3, 2023
  • By MR COOL

We’ve added a lot of variety to our DIY lineup. While this means you have a number of ways to better customize your system to your needs, so many choices might be a little overwhelming.

No need to fear, because the 4th Gen Configurator is now here! This tool will help you choose the right system to keep you and your family completely comfortable in every season. Essentially, the configurator will walk you through the process of choosing the correct system, the best air handlers, and the right line set lengths. Let’s configure a system!

To start, you’ll need to go to the main page of our website,, or either of the DIY system webpages. Scroll about halfway through the page, and you’ll find the phrase “Configure Your 4th Gen MRCOOL® DIY® System” in brackets. Click on it, and the following window will appear. 

Simply choose how many zones you need covered! Let’s pretend that we need a 3-zone unit. We’d click on the button that says “2-3 ZONE,” which is a 27,000 BTU condenser. For this unit, we’d need to ensure that the air handlers we select don’t exceed 34,000 BTUs, and that the air handlers aren’t under 20,000 BTUs. 

When you’re ready to select an air handler, a drop-down menu will appear detailing the air handlers that this specific condenser can accommodate. Larger condenser units will have larger air handler units available as options. For our purposes, let’s pretend the first room we need to cover is around 350 square feet. We’d select the 9k unit for our first air handler. 

If our second room is around 500 square feet, we’d need to select a 12k unit. Let’s pretend our third room is also 350 square feet. We’d choose a 9k unit for that space as well. 

This is not a perfect example of everyone’s needs, and is moreso representative of an estimate. Factors like insulation, climate, sun exposure, and even the number of people in a space can affect the BTU capacity that you need. The only way to get an accurate estimate of the BTU capacity you need for a space is to have an HVAC professional perform a Manual J load calculation. 

On the next page of the window, you’ll decide the length of the line sets you need.

The maximum line set length for any of our DIY systems, no matter if it’s single-zone or multi-zone, is 75 feet. The total maximum length for line sets for the 27k BTU DIY® multi-zone condenser is 175 square feet. This means, for example, that you could not get a 75 foot line set for each air handler for this condenser. The maximum line set length will vary depending on the size of the condenser.

Let’s say our first air handler will be about 30 feet away from the condenser. We should choose the 35 foot line set for this air handler. The next air handler will only be about 12 feet away, so we don’t need as much line set. We should choose the 16 foot line set. If the final air handler is 48 feet away, we should get the 50 foot line set. 

Once we’re done choosing our line sets, the next page will list our system, and the components that comprise it! 

On this screen, you’ll be able to check over the items in the bundle to ensure they’re correct. You can also copy the bundle number to find the system at your preferred retailer, and you can copy the list of items in order to put the bundle together yourself. 

The configurator takes the confusion out of what could be a daunting decision. Making sure you have the correct system for your home can make all the difference when it comes to comfort, and now you can confidently choose what system will work best for you. 

Happy configuratin’!

2 thoughts on “The New Configurator is HERE!”

  1. I’m looking for a 2 ton split air system that will work for a greenhouse and they sell at Home Depot. Will this model work for a 600 square ft room with 13 ft ceilings in 110 and 20 degree temperatures that will keep the room between 70 to 75 degrees year round? Thank you

    1. A 2-ton unit, or 24k BTU system, might work for the space you describe. We do have a 24k BTU DIY ductless mini-split that you can install yourself. Visit the configurator to choose your unit and get your model number!

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