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DIY HVAC systems, MRCOOL, Mini-Splits, Air Conditioning
  • 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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    Sizing & planningManual J Load CalculatorEstimate heating and cooling loads before selecting equipment.Open Manual J →
  • Specialty›
    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 →
    • TravelCool / RV Air Conditioners
    • Monoblock Heat Pumps
    • Compact Refrigeration
    • Water Heaters
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    • MRBREEZE
    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 & Accessories ›
      • Line Sets
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      • Tools & Gauges
    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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    • Sizing Tools ›
      • 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 →
  • Learn›
    • Start Learning ›
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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
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    • Shop by System›
      • Shop All Mini Splits
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      • Single Zone Systems
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    • Shop by Zones›
      • 2 Zones
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      • 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.*

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Search results

  • MRCOOL HVAC coil-cleaning supplies

    MRCOOL Foaming Coil Cleaner

    SALE

    MRCOOL Foaming Coil Cleaner

    Regular price $29.00
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  • RectorSeal HVAC coil-cleaning supplies

    Con-Coil Acid-Based Foaming Coil Cleaner & Brightener – Heavy-Duty HVAC Cleaner

    SALE

    Con-Coil Acid-Based Foaming Coil Cleaner & Brightener – Heavy-Duty HVAC Cleaner

    Regular price $66.00
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  • RectorSeal Foam-A-Coil foaming coil cleaner in a one-gallon jug

    RECTORSEAL 82632 Foam-A-Coil Coil Cleaner 1 Gallon

    SALE

    RECTORSEAL 82632 Foam-A-Coil Coil Cleaner 1 Gallon

    Regular price $180.00
    Sale price $180.00 Regular price $225.00
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  • MRCOOL Mini Split Cleaning and Preventative Maintenance Kit MMCK01 for DIY and ductless HVAC systems

    MRCOOL® Mini Split Cleaning Care Kit (MMCK01)

    SALE

    MRCOOL® Mini Split Cleaning Care Kit (MMCK01)

    Regular price $89.00
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  • MRCOOL HVAC coil-cleaning supplies

    MRCOOL® Mini Split Cleaning Care Kit

    SALE

    MRCOOL® Mini Split Cleaning Care Kit

    Regular price $89.00
    Sale price $89.00 Regular price $113.75
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  • Flexible off-white non-adhesive PVC wrapping tape, 2 inch wide by 50 foot roll, designed for HVAC line sets and piping insulation.

    Non-Adhesive PVC Wrapping Tape for HVAC & Piping – 2" Wide x 50' Long, Flexible Roll

    SALE

    Non-Adhesive PVC Wrapping Tape for HVAC & Piping – 2" Wide x 50' Long, Flexible Roll

    Regular price $8.24
    Sale price $8.24 Regular price $9.36
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  • Clean-N-Safe 83780 – Biodegradable HVAC Coil Cleaner (20 oz. Aerosol

    Rectorseal 83780 Clean-N-Safe 20 oz Aerosol Cleaner

    SALE

    Rectorseal 83780 Clean-N-Safe 20 oz Aerosol Cleaner

    Regular price $22.00
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  • Bottle of RectorSeal LiquidDrain condensate drain cleaner

    RectorSeal 80391 LiquidDrain Drain Cleaner 1 Quart Bottle

    SALE

    RectorSeal 80391 LiquidDrain Drain Cleaner 1 Quart Bottle

    Regular price $26.00
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  • RectorSeal Coil-Rite Evaporator Coil Cleaner – 1 Gallon (82612) | Self-Rinsing, Non-Acid Formula

    RectorSeal Coil-Rite Evaporator Coil Cleaner – 1 Gallon (82612) | Self-Rinsing, Non-Acid Formula

    SALE

    RectorSeal Coil-Rite Evaporator Coil Cleaner – 1 Gallon (82612) | Self-Rinsing, Non-Acid Formula

    Regular price $49.00
    Sale price $49.00 Regular price $61.25
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  • MRCOOL DIY E-Star Single-Zone Mini Split — 9,000 BTU, 25 ft

    MRCOOL 5th Gen ENERGY STAR® DIY Single Zone Mini Split (9k–36k BTU)

    SALE

    MRCOOL 5th Gen ENERGY STAR® DIY Single Zone Mini Split (9k–36k BTU)

    Regular price $2,330.00
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  • RectorSeal HVAC coil-cleaning supplies

    Rectorseal Coil-Cure 11070 | No-Rinse HVAC Coil Cleaner & Disinfectant Spray – 18 oz Aerosol

    SALE

    Rectorseal Coil-Cure 11070 | No-Rinse HVAC Coil Cleaner & Disinfectant Spray – 18 oz Aerosol

    Regular price $28.00
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  • MRCOOL electric heat-strip assembly with wiring and controls

    MRCOOL UHK10 10kW Electric Heat Kit with Circuit Breaker for Universal Series (R-454B)

    SALE

    MRCOOL UHK10 10kW Electric Heat Kit with Circuit Breaker for Universal Series (R-454B)

    Regular price $255.00
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  • MRCOOL electric heat-strip assembly with wiring and controls

    MRCOOL UHK05 5kW Electric Heat Kit with Circuit Breaker – Universal Series (R-454B)

    SALE

    MRCOOL UHK05 5kW Electric Heat Kit with Circuit Breaker – Universal Series (R-454B)

    Regular price $183.00
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  • MRCOOL Signature downflow conversion kit panels and brackets

    3 to 5 Ton Downflow Kit for MrCool Signature Split System Air Handler

    SALE

    3 to 5 Ton Downflow Kit for MrCool Signature Split System Air Handler

    Regular price $191.00
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  • MRCOOL Signature downflow conversion kit panels and brackets

    MRCOOL MPDK2436 2 to 3 Ton Downflow Kit for Signature Package Unit

    SALE

    MRCOOL MPDK2436 2 to 3 Ton Downflow Kit for Signature Package Unit

    Regular price $191.00
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  • MRCOOL DIY four-zone system with four ceiling cassettes, two-fan condenser, line sets and controls

    MRCOOL DIY 5th Gen Multi-Zone 4-Zone 48,000 BTU 22 SEER2 (6K + 9K + 12K + 12K) Ductless Mini-Split Air Conditioner and Heat Pump with Ceiling Cassettes

    SALE

    MRCOOL DIY 5th Gen Multi-Zone 4-Zone 48,000 BTU 22 SEER2 (6K + 9K + 12K + 12K) Ductless Mini-Split Air Conditioner and Heat Pump with Ceiling Cassettes

    Regular price $8,880.00
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  • RAD REH66 HVAC equipment hanger shown supporting a horizontal air handler and secondary drain pan

    RAD REH66 66" Universal HVAC Equipment Hanger

    SALE

    RAD REH66 66" Universal HVAC Equipment Hanger

    Regular price $329.95
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  • MRCOOL Signature downflow conversion kit panels and brackets

    1.5 to 2.5 Ton Downflow Kit for MrCool Signature Split System Air Handler

    SALE

    1.5 to 2.5 Ton Downflow Kit for MrCool Signature Split System Air Handler

    Regular price $157.00
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  • RectorSeal Desolv Coil Cleaning Kit (82560). Order now from MRCOOL DIY Direct

    RectorSeal Desolv Coil Cleaning Kit 82560 for Mini Split & HVAC Coil Cleaning | Non-Corrosive Biodegradable Cleaner

    SALE

    RectorSeal Desolv Coil Cleaning Kit 82560 for Mini Split & HVAC Coil Cleaning | Non-Corrosive Biodegradable Cleaner

    Regular price $353.00
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  • MRCOOL electric heat-strip assembly with wiring and controls

    MRCOOL UHK08 8kW Electric Heat Kit with Circuit Breaker for Universal Series (R-454B)

    SALE

    MRCOOL UHK08 8kW Electric Heat Kit with Circuit Breaker for Universal Series (R-454B)

    Regular price $237.00
    Sale price $237.00 Regular price $296.25
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  • MRCOOL anti-vibration rubber mounting pads for an outdoor condenser

    Anti-Vibration Rubber Pads for Mini Split AC Condenser – Shock Absorbing Mounting Pads (9K–18K BTU)

    SALE

    Anti-Vibration Rubber Pads for Mini Split AC Condenser – Shock Absorbing Mounting Pads (9K–18K BTU)

    Regular price $38.00
    Sale price $38.00 Regular price $47.50
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  • 5/8" ID Mini-Split Condensate Drain Line – Priced Per Foot or In Bulk -

    5/8" ID Mini-Split Condensate Drain Line – Priced Per Foot or In Bulk

    SALE

    5/8" ID Mini-Split Condensate Drain Line – Priced Per Foot or In Bulk

    Regular price $2.79
    Sale price $2.79 Regular price $3.75
    You Save: $0.96
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  • R-454B refrigerant switchover 2025 guide showing mini split leak sensors and warning about spray foam causing false leak alarms

    Understanding R-454B Refrigerant, Leak Sensors,...

    Blog

    Understanding R-454B Refrigerant, Leak Sensors,...

    Blog
  • Photo of a frozen MRCOOL ductless mini split line set and air handler, used to illustrate freezing issues caused by airflow or refrigerant problems.

    Why Is My Ductless Mini Split Freezing Up? Trou...

    Blog

    Why Is My Ductless Mini Split Freezing Up? Trou...

    Blog
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