2-Zone MRCOOL DIY Mini Split Systems (5th Generation)

Heat and cool two separate rooms with a single outdoor condenser using MRCOOL’s 5th Generation DIY multi-zone technology. These systems include pre-charged R454B line sets and Quick-Connect fittings, so there’s no refrigerant handling required.

Our 2-zone MRCOOL DIY systems are built for homeowners who want professional results without professional labor costs. Each package includes two indoor air handlers (wall mounts, ceiling cassettes, or a mix of both), a matching outdoor condenser, and factory pre-charged R454B line sets. You don’t need gauges, a vacuum pump, or an EPA license — just basic tools and time to follow the step-by-step instructions.

Use a 2-zone MRCOOL system to handle two bedrooms, a bedroom and office, a living room and kitchen, or a garage and bonus room. Each zone has its own thermostat and wireless control, so you can dial in comfort exactly where you need it without overheating or overcooling the rest of the house.

Quick Answers

  • DIY-ready? Yes — everything is pre-charged with R454B and uses MRCOOL Quick-Connect fittings.
  • Indoor unit options? Choose two wall mounts, two ceiling cassettes, or a combination of both.
  • Help sizing? Use our Custom Multi-Zone Builder or email sales@mrcooldiydirect.com.

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If you’d rather use contractor-grade, non-DIY MRCOOL equipment installed by a licensed pro, our Olympus Series systems are built for traditional professional installation and high-performance comfort.

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  • Great option when DIY isn’t the right fit
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Ideal when you plan to work with a local HVAC contractor.

2-Zone MRCOOL DIY Mini Split FAQ

What is a 2-zone MRCOOL DIY mini split system?

A 2-zone MRCOOL DIY mini split system lets you heat and cool two separate rooms or areas using a single outdoor condenser. Each system includes two indoor air handlers—wall mounts, ceiling cassettes, or a combination of both—and factory pre-charged R454B Quick-Connect line sets so homeowners can install without handling refrigerant.

Do I need an HVAC license to install a 2-zone MRCOOL DIY system?

No. MRCOOL DIY systems are designed for homeowner installation and use pre-charged R454B line sets with Quick-Connect fittings. There is no need for an EPA license, vacuum pump, or refrigerant gauges when installing a 2-zone MRCOOL DIY system.

Can I mix wall-mounted air handlers and ceiling cassettes in a 2-zone configuration?

Yes. MRCOOL 5th Generation multi-zone condensers support wall-mounted air handlers, ceiling cassettes, or a mix of both. You can choose the right style for each room based on available wall and ceiling space.

What are 2-zone systems typically used for?

2-zone systems are perfect for pairing two bedrooms, a bedroom and office, a living room and kitchen, or a garage and bonus room. Each zone gets its own thermostat and remote or app control for targeted comfort and better energy savings.

What BTU sizes should I choose for a 2-zone MRCOOL system?

Typical 2-zone setups use 9k–12k BTU for smaller bedrooms or offices and 12k–18k BTU for larger rooms, living areas, or garages depending on insulation and climate. MRCOOL DIY Direct’s Custom Multi-Zone Builder can help you choose the right combination.

How long can MRCOOL DIY line sets be in a 2-zone system?

MRCOOL DIY Quick-Connect line sets are available in 16, 25, 35, and 50 foot lengths. Many 2-zone condensers support line set extensions and generous total line length, giving flexibility in locating indoor units. Always check your specific model for maximum line length guidelines.

Can a 2-zone MRCOOL system heat effectively in cold climates?

Yes. 5th Generation MRCOOL Hyper Heat models provide reliable low-ambient heating, with many units operating down to -13°F. Check the specifications for your chosen model to confirm cold-climate performance.

Where can I get help designing or sizing a 2-zone MRCOOL system?

Use the Custom Multi-Zone Builder at https://mrcooldiydirect.com/pages/build-your-customized-mini-split , or email MRCOOL DIY Direct at sales@mrcooldiydirect.com for personalized sizing and layout recommendations.