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    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 →
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    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 →
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    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 →
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      • Mini Splits 101
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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.*

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Search results

  • MRCOOL HVAC electronic control-board assembly

    Control Board Sub-Assembly for MRCOOL DIY-24-HP-C-230B Ductless Heat Pump Condenser

    SALE

    Control Board Sub-Assembly for MRCOOL DIY-24-HP-C-230B Ductless Heat Pump Condenser

    Regular price $355.35
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  • MRCOOL HVAC electronic control-board assembly

    Control Board for MrCool Ductless Heat Pump Condenser DIY-12-HP-C-115C25

    SALE

    Control Board for MrCool Ductless Heat Pump Condenser DIY-12-HP-C-115C25

    Regular price $251.32
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  • MRCOOL HVAC electronic control-board assembly

    Replacement Control Board for the MRCOOL DIY 36k Multi-Zone Condenser (model DIY-MULTI4-36HP230C)

    SALE

    Replacement Control Board for the MRCOOL DIY 36k Multi-Zone Condenser (model DIY-MULTI4-36HP230C)

    Regular price $380.07
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  • MRCOOL HVAC electronic control-board assembly

    MRCOOL VersaPro Series Replacement Control Board | Compatible with MGA80EE100C5B

    SALE

    MRCOOL VersaPro Series Replacement Control Board | Compatible with MGA80EE100C5B

    Regular price $433.63
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  • MRCOOL HVAC electronic control-board assembly

    MRCOOL Replacement Control Board Sub Assembly for DIY-36-HP-C-230C25 Ductless Heat Pump Condenser | Genuine OEM Part

    SALE

    MRCOOL Replacement Control Board Sub Assembly for DIY-36-HP-C-230C25 Ductless Heat Pump Condenser | Genuine OEM Part

    Regular price $420.24
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  • MRCOOL DIY multi-zone open indoor air handler showing electronic controls

    Genuine MRCOOL Main Control Board Sub-Assembly for DIY-MULTI4-36HP230 Outdoor Unit

    SALE

    Genuine MRCOOL Main Control Board Sub-Assembly for DIY-MULTI4-36HP230 Outdoor Unit

    Regular price $610.79
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  • Control Board for MRCOOL Ductless Heat Pump Condenser A-12-HP-C-230B -

    Control Board for MRCOOL Ductless Heat Pump Condenser A-12-HP-C-230B

    SALE

    Control Board for MRCOOL Ductless Heat Pump Condenser A-12-HP-C-230B

    Regular price $271.92
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  • MRCOOL HVAC electronic control-board assembly

    Control Board for MRCOOL A‑18‑HP‑WMAH‑230B 18k BTU Ductless Mini Split Wall‑Mounted Air Handler – Part # 17222000028516 – Fast USA Shipping from MRCOOL DIY Direct

    SALE

    Control Board for MRCOOL A‑18‑HP‑WMAH‑230B 18k BTU Ductless Mini Split Wall‑Mounted Air Handler – Part # 17222000028516 – Fast USA Shipping from MRCOOL DIY Direct

    Regular price $183.34
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  • MRCOOL HVAC electronic control-board assembly

    Genuine MRCOOL Main Condenser Control Board for MHP13036 – Part #30221404 | Factory OEM Replacement

    SALE

    Genuine MRCOOL Main Condenser Control Board for MHP13036 – Part #30221404 | Factory OEM Replacement

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  • MRCOOL HVAC electronic control-board assembly

    Outdoor Condenser Control Board Sub-Assembly for DIY-12-HP-C-115AE - Genuine MRCOOL Replacement Parts -

    SALE

    Outdoor Condenser Control Board Sub-Assembly for DIY-12-HP-C-115AE - Genuine MRCOOL Replacement Parts -

    Regular price $318.27
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  • MRCOOL HVAC electronic control-board assembly

    Outdoor Condenser Control Board Subassembly for MRCOOL 1st Generation DIY-24-HP-230A & AE

    SALE

    Outdoor Condenser Control Board Subassembly for MRCOOL 1st Generation DIY-24-HP-230A & AE

    Regular price $381.10
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  • Front view of control board subassembly for MRCOOL EZPRO-12-HP-WMAH-115 wall mounted air handler

    Control Board Subassembly for MRCOOL Easy PRO 12k Wall Mounted Air Handler – EZPRO-12-HP-WMAH-115

    SALE

    Control Board Subassembly for MRCOOL Easy PRO 12k Wall Mounted Air Handler – EZPRO-12-HP-WMAH-115

    Regular price $149.35
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  • HVAC electronic control-board assembly

    Electronic Control Box Assembly - DIY-MULTI3-27HP230C

    SALE

    Electronic Control Box Assembly - DIY-MULTI3-27HP230C

    Regular price $458.35
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  • MRCOOL HVAC electronic control-board assembly

    MRCOOL A-12-HP-C-230C Condenser Control Board Sub-Assembly – OEM Replacement Part

    SALE

    MRCOOL A-12-HP-C-230C Condenser Control Board Sub-Assembly – OEM Replacement Part

    Regular price $318.27
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  • MRCOOL HVAC electronic control-board assembly

    Electronic Control Box Subassembly for MRCOOL DIY-MULTI3-27HP230 Heat Pump Condenser

    SALE

    Electronic Control Box Subassembly for MRCOOL DIY-MULTI3-27HP230 Heat Pump Condenser

    Regular price $435.69
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  • MRCOOL HVAC electronic control-board assembly

    Electronic Control Box Subassembly for MRCOOL DIY 18K BTU Heat Pump Condenser for Model: DIY-18-HP-C-230B

    SALE

    Electronic Control Box Subassembly for MRCOOL DIY 18K BTU Heat Pump Condenser for Model: DIY-18-HP-C-230B

    Regular price $364.62
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  • MRCOOL HVAC electronic control-board assembly

    MRCOOL Electronic Control Box Subassembly Control Board DIY-18-HP-230A / AE

    SALE

    MRCOOL Electronic Control Box Subassembly Control Board DIY-18-HP-230A / AE

    Regular price $456.29
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  • MRCOOL HVAC electronic control-board assembly

    Control Board for MRCOOL Central Air Handler 1st Generation Universal Series – Model MDUI18024036

    SALE

    Control Board for MRCOOL Central Air Handler 1st Generation Universal Series – Model MDUI18024036

    Regular price $299.73
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  • MRCOOL HVAC electronic control-board assembly

    Genuine MRCOOL Indoor Wall Mounted Air Handler Control Board – DIY-12-HP-WMAH-230B Replacement Part

    SALE

    Genuine MRCOOL Indoor Wall Mounted Air Handler Control Board – DIY-12-HP-WMAH-230B Replacement Part

    Regular price $172.01
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  • HVAC electronic control-board assembly

    Electronic Control Box Subassembly for A-09-HP-C-115C

    SALE

    Electronic Control Box Subassembly for A-09-HP-C-115C

    Regular price $275.01
    Sale price $275.01 Regular price $312.39
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  • MRCOOL HVAC electronic control-board assembly

    MRCOOL Outdoor Control Board Sub-Assembly – Compatible with A-09-HP-C-230C

    SALE

    MRCOOL Outdoor Control Board Sub-Assembly – Compatible with A-09-HP-C-230C

    Regular price $248.23
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  • MRCOOL HVAC electronic control-board assembly

    Indoor Wall Air Handler Control Board – Advantage Series A-18-HP-WMAH-230C (Part Number: 17222000037413)

    SALE

    Indoor Wall Air Handler Control Board – Advantage Series A-18-HP-WMAH-230C (Part Number: 17222000037413)

    Regular price $203.94
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  • Infographic explaining MRCOOL mini split control board subassemblies and built-in capacitors, highlighting model-specific compatibility for DIY, Olympus, Advantage, EZPRO, and Energy Star series.

    MRCOOL Mini Split Capacitors and Control Boards...

    Blog

    MRCOOL Mini Split Capacitors and Control Boards...

    Blog
  • MRCOOL Error Code Diagnostics Guide

    Page
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