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  • Mini Splits›
    RecommendedRecommended for multi-zoneBUILD A DIY MULTI-ZONE SYSTEMConfigure zones, indoor units, capacities, and line-set lengths.START BUILDING →
    Installation pathDesigned for DIY InstallationHomeowner-oriented systems with factory-precharged connection options.Shop DIY systems →Installation pathProfessional InstallationCompare Olympus and Advantage systems intended for traditional HVAC installation.Compare systems → Planning a complete system?Financing AvailableExplore payment options for a complete multi-zone purchase.View financing →
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    Not sure what size?Plan before you buyUse the BTU calculator as a starting point for system sizing.Open BTU calculator →
  • Central HVAC›
    DIY hybrid configurationPlan a DIY Hybrid SystemCombine a central ducted air handler with supported wall or cassette zones on a DIY multi-zone condenser.Open Hybrid Builder →
    Before you chooseInstallation Varies by ConfigurationSome eligible split systems offer precharged options; packaged, furnace, and traditional configurations follow professional-installation paths.Get selection help → Planning a whole-home purchase?Financing AvailableReview payment options for larger equipment purchases.Explore financing →
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    TravelCool rooftop RV air conditioner at a lakeside campsite Comfort for the roadRV air conditioningTravelCool RV Air ConditioningRooftop cooling and supplemental heat-pump heating for RV applications.Explore TravelCool →
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    MRCOOL Monoblock heat pump installed through an exterior wall All-in-one HVACMonoblock Heat PumpsHeating and cooling without a separate outdoor unit.Shop Monoblock → MRCOOL compact refrigeration equipment for a walk-in cooler Walk-in coolingCompact RefrigerationSelf-contained refrigeration for walk-in cooler and freezer applications.Explore Refrigeration → MRCOOL industrial HVLS fan installed in a warehouse Large-space airflowIndustrial HVLS FansLarge-diameter fans for warehouses and other expansive spaces.Shop HVLS Fans →
  • Parts & Accessories›
    Replacement partsStart with your model numberShop genuine MRCOOL replacement parts. Confirm equipment details before ordering.Shop replacement parts →
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    Installation & accessoriesInstallation essentialsLine sets, mounting, kits, controls, and installation accessories.Shop accessories →
  • Build & Size›
    RecommendedPrimary configuration toolBuild a DIY Multi-Zone SystemBuild a matched MRCOOL DIY multi-zone system from zones through line-set lengths.Start building →
    • System Builders ›
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      • Mini-Split BTU Calculator
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    Sizing toolsFind the right sizeUse the BTU calculator or Manual J tools before choosing equipment.Start sizing → After you planExplore Payment OptionsAfter configuring and sizing your project, review available financing options.View financing →
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    Learn the basicsNew to MRCOOL? Start hereGet straightforward guides for choosing, planning, and installing your system.Start learning →
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    • Build Your System›
      • Multi-Zone System Builder
      • Olympus System Builder
      • Mini-Split BTU Calculator
    • Shop by System›
      • Shop All Mini Splits
      • Shop All DIY Mini Splits
      • Single Zone Systems
      • Multi-Zone Systems
      • DIY Pre-Charged Systems
    • Shop by Zones›
      • 2 Zones
      • 3 Zones
      • 4 Zones
      • 5 Zones
      • 6 Zones
    • Popular Series›
      • 5th Gen DIY
      • DIY Hyper Heat
      • Easy Pro
      • Olympus
    RecommendedRecommended for multi-zoneBUILD A DIY MULTI-ZONE SYSTEMChoose your zones, indoor units, capacities, and line-set lengths for a matched MRCOOL DIY multi-zone system.START BUILDING →
    Installation pathDesigned for DIY InstallationExplore homeowner-oriented mini splits with factory-precharged connection options.Shop DIY systems →Installation pathProfessional InstallationCompare Olympus and Advantage systems intended for traditional HVAC installation.Compare systems → Planning a complete system?Financing AvailableExplore payment options for a complete multi-zone purchase.View financing →
    Not sure what size?Plan before you buyUse the BTU calculator as a starting point for system sizing.Open BTU calculator →
    • Build & Plan›
      • Build a Central System
      • Manual J Load Calculator
      • Get a Free Quote
    • Shop by System›
      • Central Ducted Heat Pumps
      • Dual Fuel Systems
      • Package Units
      • Gas Furnaces
    • Shop by Series›
      • Universal Series
      • Hyper Heat Series
      • VersaPro Series
      • Signature Series
    DIY hybrid configurationPlan a DIY Hybrid SystemCombine a central ducted air handler with supported wall or cassette zones on a DIY multi-zone condenser.Open Hybrid Builder →
    Before you chooseInstallation Varies by ConfigurationSome eligible split systems offer precharged connection options. Packaged, furnace, and traditional configurations follow professional-installation paths.Get selection help → Planning a whole-home purchase?Financing AvailableReview payment options for larger equipment purchases.Explore financing →
    Sizing & planningManual J Load CalculatorEstimate heating and cooling loads before selecting equipment.Open Manual J →
  • TravelCool rooftop RV air conditioner at a lakeside campsite Comfort for the roadRV air conditioningTravelCoolInverter-driven rooftop cooling and supplemental heat-pump heating for RV applications.Explore TravelCool → MRCOOL Monoblock heat pump installed through an exterior wall All-in-one HVACMonoblock Heat PumpsHeating and cooling without a separate outdoor unit.Shop Monoblock → MRCOOL compact refrigeration equipment for a walk-in cooler Walk-in coolingCompact RefrigerationSelf-contained refrigeration for walk-in cooler and freezer applications.Explore Refrigeration → MRCOOL industrial HVLS fan installed in a warehouse Large-space airflowIndustrial HVLS FansLarge-diameter fans for warehouses and other expansive spaces.Shop HVLS Fans →
    More specialtyWater Heaters →MRBREEZE →View all Specialty Equipment →
    • Replacement Parts›
      • Shop All Replacement Parts
      • Control Boards
      • Fan Motors
    • Installation & Accessories›
      • Line Sets
      • Installation Kits
      • Couplers, Wire & Adapters
      • Condenser Mounting
      • Tools & Gauges
    Replacement partsStart with your model numberShop genuine MRCOOL replacement parts. Confirm equipment details before ordering.Shop replacement parts →
    Installation & accessoriesInstallation essentialsLine sets, mounting, kits, controls, and installation accessories.Shop accessories →
    • System Builders›
      • Multi-Zone System Builder
      • Hybrid System Builder
      • Olympus System Builder
    • Sizing Tools›
      • Mini-Split BTU Calculator
      • Manual J Load Calculator
      • HVAC Replacement & Sizing Guide
    RecommendedPrimary configuration toolBuild a DIY Multi-Zone SystemBuild a matched MRCOOL DIY multi-zone system from zones through line-set lengths.Start building →
    Sizing toolsFind the right sizeUse the BTU calculator or Manual J tools before choosing equipment.Start sizing → After you planExplore Payment OptionsAfter configuring and sizing your project, review available financing options.View financing →
    • Start Learning›
      • Mini Splits 101
      • DIY Installation Guide
      • Tools & Calculators
    • Help & Reference›
      • DIY FAQs
      • Error Codes
      • QMID Codes
    • Official Product Information›
      • Knowledge Center
      • Manuals & Documents
      • AHRI & EnergyGuide Resources
    • View All Learning Center
    Learn the basicsNew to MRCOOL? Start hereGet straightforward guides for choosing, planning, and installing your system.Start learning →
    • Customer Support›
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    Customer supportHow can we help?Contact our team, track an order, start a return, or find warranty help.Get help →
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USA's Most Trusted MRCOOL Dealer – Free Shipping On Systems*

MRCOOL DIY DIRECT / LIMITED-TIME PROJECT PACKS

5th Gen E-Star Single-Zone Project Packs

Complete 5th Gen E-Star single-zone systems with LineGuard and a Care Kit. Choose one system or a package for several spaces. Standard freight included on buy-now packages.*

Shop Project Packs ↗

Search results

  • MRCOOL DIY 4th Gen wall-mounted indoor air handler

    MRCOOL DIY 4th Generation 12K BTU Wall Mount Air Handler 230 Volt with Enhanced WiFi, DIY-12-HP-WMAH-230C25

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    MRCOOL DIY 4th Generation 12K BTU Wall Mount Air Handler 230 Volt with Enhanced WiFi, DIY-12-HP-WMAH-230C25

    Regular price $580.00
    Sale price $580.00 Regular price $725.00
    You Save: $145.00
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  • MRCOOL wall-mounted smart HVAC thermostat

    MRCOOL Smart Thermostat 24 Volt (MST04)

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    MRCOOL Smart Thermostat 24 Volt (MST04)

    Regular price $101.00
    Sale price $101.00 Regular price $126.25
    You Save: $25.25
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  • MRCOOL wall-mounted smart HVAC thermostat

    MRCOOL Smart Thermostat MST06 – 24V WiFi Programmable Thermostat for Heat Pumps & Furnaces

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    MRCOOL Smart Thermostat MST06 – 24V WiFi Programmable Thermostat for Heat Pumps & Furnaces

    Regular price $121.00
    Sale price $121.00 Regular price $151.25
    You Save: $30.25
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  • MRCOOL Universal 2 to 3 Ton 20 SEER Central Heat Pump Air Conditioner System MDU18024036 -

    MRCOOL Universal 2 to 3 Ton 20 SEER Central Heat Pump Air Conditioner System MDU18024036

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    MRCOOL Universal 2 to 3 Ton 20 SEER Central Heat Pump Air Conditioner System MDU18024036

    Regular price $3,738.00
    Sale price $3,738.00 Regular price $4,672.50
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  • Wall-mounted smart HVAC thermostat

    PRO-1 T855SH Universal Programmable Thermostat – Up to 5 Heat / 3 Cool, Auto Changeover

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    PRO-1 T855SH Universal Programmable Thermostat – Up to 5 Heat / 3 Cool, Auto Changeover

    Regular price $171.00
    Sale price $171.00 Regular price $213.75
    You Save: $42.75
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  • MRCOOL DIY multi-zone outdoor heat pump condenser

    DIY Multi-Zone 3-Zone 27K BTU Condenser, 4th Gen Series, DIY-MULTI3-27HP230C

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    DIY Multi-Zone 3-Zone 27K BTU Condenser, 4th Gen Series, DIY-MULTI3-27HP230C

    Regular price $1,801.00
    Sale price $1,801.00 Regular price $2,251.25
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  • MRCOOL Universal 4 to 5 Ton (48000-60000 BTU) 18 SEER Central Heat Pump Air Conditioner System MDU18048060 -

    MRCOOL Universal 4 to 5 Ton (48000-60000 BTU) 18 SEER Central Heat Pump Air Conditioner System MDU18048060

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    MRCOOL Universal 4 to 5 Ton (48000-60000 BTU) 18 SEER Central Heat Pump Air Conditioner System MDU18048060

    Regular price $4,759.00
    Sale price $4,759.00 Regular price $5,948.75
    You Save: $1,189.75
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  • Wall-mounted smart HVAC thermostat

    PRO-1 T721 Non-Programmable Thermostat – 2 Heat / 1 Cool for Heat Pumps & Conventional Systems

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    PRO-1 T721 Non-Programmable Thermostat – 2 Heat / 1 Cool for Heat Pumps & Conventional Systems

    Regular price $81.00
    Sale price $81.00 Regular price $101.25
    You Save: $20.25
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  • MRCOOL VersaPro packaged outdoor HVAC unit

    MRCOOL VersaPro 30k BTU Heat Pump Package Unit, MPH301H413B

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    MRCOOL VersaPro 30k BTU Heat Pump Package Unit, MPH301H413B

    Regular price $3,306.00
    Sale price $3,306.00 Regular price $4,132.50
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  • Rectorseal Ceiling Diffuser Square with Antique Grille Integrated Ceiling Box – 6"x6"

    Rectorseal Ceiling Diffuser Square with Antique Grille Integrated Ceiling Box – 6"x6"

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    Rectorseal Ceiling Diffuser Square with Antique Grille Integrated Ceiling Box – 6"x6"

    Regular price $55.00
    Sale price $55.00 Regular price $68.75
    You Save: $13.75
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  • MRCOOL wall-mounted tankless water heater

    MRCOOL Liquid Propane Tankless Water Heater (MHWH199NCLU)

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    MRCOOL Liquid Propane Tankless Water Heater (MHWH199NCLU)

    Regular price $1,701.00
    Sale price $1,701.00 Regular price $2,126.25
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