• MRCOOL DIY Select 12000 BTU mini split system complete kit with indoor air handler, condenser, remote, and pre-charged line set
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MRCOOL®

MRCOOL DIY® Select 12,000 BTU Single Zone Mini Split Heat Pump 115V with 11.5 ft Quick Connect Line Set

MRCOOL DIY® Select 12,000 BTU Single Zone Mini Split Heat Pump 115V with 11.5 ft Quick Connect Line Set

$1,399.00 USD
$1,399.00 USD
On sale Sold out
Shipping calculated at checkout.

Powerful DIY Comfort for Medium-Sized Spaces

The MRCOOL DIY® Select 12,000 BTU Single Zone Mini Split Heat Pump delivers reliable year-round heating and cooling for spaces up to 550 square feet without the cost of professional installation. Designed for true DIY installation, this 115V mini split system includes an 11.5 ft pre-charged Quick Connect® line set, allowing homeowners to install their own HVAC system without vacuum pumps, gauges, or refrigerant handling.

Built on proven MRCOOL® technology, the DIY Select series offers a budget-friendly alternative to traditional ductless systems while still delivering the features that matter: inverter-driven efficiency, quiet operation, smart control, and simplified installation.

What Makes the DIY Select 12K Different?

Many low-cost mini split systems still require proper evacuation, specialized tools, and refrigerant handling. When those steps are skipped, performance and longevity can suffer. The MRCOOL DIY Select 12K eliminates that risk with factory pre-charged Quick Connect® fittings, allowing homeowners to install the system without opening the refrigerant circuit.

The result is a simpler, cleaner, and more reliable installation process that removes one of the biggest barriers to owning a ductless mini split system.

Key Features

  • 12,000 BTU heating and cooling for spaces up to 550 sq. ft.
  • 115V operation ideal for residential applications
  • Includes 11.5 ft pre-charged Quick Connect® line set
  • No vacuuming or refrigerant handling required
  • Up to 17.5 SEER2 cooling efficiency
  • Up to 9.0 HSPF2-4 heating efficiency
  • Inverter-driven compressor for consistent temperature control
  • Ultra-quiet operation as low as 17.5 dB(A)
  • Smart control via MRCOOL® Comfort App
  • Compatible with Alexa and Google Assistant
  • R-454B refrigerant for future-ready performance
  • White indoor air handler standard
  • Black indoor air handler option coming soon

Includes 11.5 ft Pre-Charged Line Set

The included 11.5 ft pre-charged line set is a major advantage over standard DIY systems that often include longer 16 ft or 25 ft line sets. This shorter length helps reduce excess coiling, resulting in a cleaner and more professional installation.

For installations requiring longer runs, optional pre-charged line sets are available in 16 ft, 25 ft, 35 ft, and 50 ft lengths.

Designed for True DIY Installation

The MRCOOL DIY Select 12K removes the most complicated part of mini split installation. The pre-charged Quick Connect® line set eliminates the need for vacuum pumps, gauges, and refrigerant handling, allowing homeowners to install the system with basic tools.

This significantly reduces installation cost while maintaining reliable system performance, making it an ideal solution for homeowners who want professional-level comfort without the professional install bill.

White Standard, Black Option Coming Soon

The system includes a standard white indoor air handler designed to blend into most residential spaces. MRCOOL has also introduced a black air handler option for the DIY Select series, ideal for modern interiors, garages, and design-focused environments.

The black SKU has not yet been released but will be available as a selectable option once launched.

Smart Control and Connected Comfort

Control your system from anywhere using the MRCOOL® Comfort App. Adjust temperature, set schedules, and monitor performance directly from your smartphone. Voice control compatibility with Amazon Alexa and Google Assistant adds even more convenience.

12,000 BTU System Specifications

System Type Single Zone Mini Split Heat Pump
Cooling Capacity 12,000 BTU
Heating Capacity 12,000 BTU
Voltage 115V
Coverage Area Up to 550 sq. ft.
SEER2 17.5
HSPF2-4 9.0
Refrigerant R-454B
Included Line Set 11.5 ft pre-charged Quick Connect® line set
Optional Line Set Lengths 16 ft, 25 ft, 35 ft, and 50 ft
Indoor Noise Level As low as 17.5 dB(A)
System SKU DIYS-12-HP-115A11-O

Ideal Applications

  • Bedrooms
  • Living rooms
  • Home offices
  • Garages and workshops
  • Rental properties
  • Additions and bonus rooms

Why Buy from MRCOOL DIY Direct?

MRCOOL DIY Direct specializes in MRCOOL DIY mini split systems, installation accessories, and replacement parts. We help homeowners across the country choose the right system for their space, layout, and budget.

If you're looking for a mid-size DIY mini split that balances power, efficiency, and ease of installation, the MRCOOL DIY Select 12,000 BTU Mini Split Heat Pump delivers dependable comfort without the installation cost.

See all the details

Five checks before you buy

Will this work for you?

You do not need every answer memorized. You do need these five parts of the plan to agree.

  1. 1. The size

    A heating and cooling load calculation should show that the space needs about BTU. Square footage alone cannot make that call.

  2. 2. The circuit

    This is a V system. Have the circuit checked for this system.

  3. 3. The route

    The selected option covers ft. Measure the real path, including bends and service room.

  4. 4. The power source

    Grid, battery, solar, and generator plans all need to support this model plus the other loads running at the same time.

  5. 5. The locations

    Make room for airflow, drainage, weather protection, service access, and a safe outdoor-unit support.

Can I run this? Compare systems
Your selected packageWhat will you receive?

Start with the three parts that make this a complete single-zone system. Open each item to see which parts come with the option you selected.

01Indoor air handlerOne indoor unit

This is the part that mounts inside the space and delivers the conditioned air.

02Outdoor condenserOne outdoor unit

This is the outdoor half of the matched heat-pump system.

03Pre-charged connection set ft in the selected option

The selected package provides the documented total route length shown above. Measure the actual path before ordering.

What you may still need: outdoor support, line covers, electrical parts, drains, fasteners, and weatherproofing depend on your site and installation.

Installation readinessCan you install it yourself?

What “DIY-oriented” really means

The connection method may reduce some refrigerant work, but the full job still includes mounting, drainage, electrical work, line routing, weatherproofing, and startup.

A DIY connection does not make every site or every step suitable for a first-time installer.

You should be comfortable with:
  • Locating and mounting both units safely
  • Planning condensate drainage
  • Protecting the line-set route
  • Following the manual for your system
  • Having an electrician handle the parts that require one
Plan the workWhat does installation look like?
  1. 1
    Check everything before you start

    Make sure the size, circuit, unit locations, line route, drainage, and local requirements all work together.

  2. 2
    Check the delivery

    Match the indoor unit, outdoor unit, selected line-set option, and documented package contents.

  3. 3
    Mount and route

    Secure both units, create the wall path, protect the lines, and give condensate a reliable way out.

  4. 4
    Complete the electrical work

    Follow the manual for your system and local electrical requirements.

  5. 5
    Start up and check

    Use the manual’s startup steps, look for drainage or connection problems, and keep the service path clear.

Can this be a weekend project? Sometimes—but the honest answer depends on the building, access, electrical work, weather, tools, and your experience. Work through these details before you schedule the job.

Power requirementsWill your battery, generator, or solar setup work?
Energy sourceGrid, solar, or generator
Storage and conversionBattery and inverter when used
This mini splitPlus every other load

Voltage is only the starting point. Make sure the inverter, batteries, charging, generator, weather, other loads, and extra power kept available can all support the system over time.

Estimate power needs
Finish the installationWhich accessories do you actually need?
Usually needed

A safe outdoor-unit support

Use a suitable pad, wall bracket, or other approved support for the equipment and site.

Compare mounting choices
Depends on the route

Line protection

Protect exposed refrigerant lines, control wire, and drain where the installation calls for it.

See line-set covers
Only when you need more reach

A compatible line-set extension

Measure first. Longer is not automatically better, and maximum length still applies.

See compatible extensions
Depends on the site and local code

Electrical protection and disconnect

Use the installation manual for this system and the electrical requirements for your location.

Review installation accessories
The full buying guideWhy might you choose—or skip—this system?

Powerful DIY Comfort for Medium-Sized Spaces

The MRCOOL DIY® Select 12,000 BTU Single Zone Mini Split Heat Pump delivers reliable year-round heating and cooling for spaces up to 550 square feet without the cost of professional installation. Designed for true DIY installation, this 115V mini split system includes an 11.5 ft pre-charged Quick Connect® line set, allowing homeowners to install their own HVAC system without vacuum pumps, gauges, or refrigerant handling.

Built on proven MRCOOL® technology, the DIY Select series offers a budget-friendly alternative to traditional ductless systems while still delivering the features that matter: inverter-driven efficiency, quiet operation, smart control, and simplified installation.

What Makes the DIY Select 12K Different?

Many low-cost mini split systems still require proper evacuation, specialized tools, and refrigerant handling. When those steps are skipped, performance and longevity can suffer. The MRCOOL DIY Select 12K eliminates that risk with factory pre-charged Quick Connect® fittings, allowing homeowners to install the system without opening the refrigerant circuit.

The result is a simpler, cleaner, and more reliable installation process that removes one of the biggest barriers to owning a ductless mini split system.

Key Features

  • 12,000 BTU heating and cooling for spaces up to 550 sq. ft.
  • 115V operation ideal for residential applications
  • Includes 11.5 ft pre-charged Quick Connect® line set
  • No vacuuming or refrigerant handling required
  • Up to 17.5 SEER2 cooling efficiency
  • Up to 9.0 HSPF2-4 heating efficiency
  • Inverter-driven compressor for consistent temperature control
  • Ultra-quiet operation as low as 17.5 dB(A)
  • Smart control via MRCOOL® Comfort App
  • Compatible with Alexa and Google Assistant
  • R-454B refrigerant for future-ready performance
  • White indoor air handler standard
  • Black indoor air handler option coming soon

Includes 11.5 ft Pre-Charged Line Set

The included 11.5 ft pre-charged line set is a major advantage over standard DIY systems that often include longer 16 ft or 25 ft line sets. This shorter length helps reduce excess coiling, resulting in a cleaner and more professional installation.

For installations requiring longer runs, optional pre-charged line sets are available in 16 ft, 25 ft, 35 ft, and 50 ft lengths.

Designed for True DIY Installation

The MRCOOL DIY Select 12K removes the most complicated part of mini split installation. The pre-charged Quick Connect® line set eliminates the need for vacuum pumps, gauges, and refrigerant handling, allowing homeowners to install the system with basic tools.

This significantly reduces installation cost while maintaining reliable system performance, making it an ideal solution for homeowners who want professional-level comfort without the professional install bill.

White Standard, Black Option Coming Soon

The system includes a standard white indoor air handler designed to blend into most residential spaces. MRCOOL has also introduced a black air handler option for the DIY Select series, ideal for modern interiors, garages, and design-focused environments.

The black SKU has not yet been released but will be available as a selectable option once launched.

Smart Control and Connected Comfort

Control your system from anywhere using the MRCOOL® Comfort App. Adjust temperature, set schedules, and monitor performance directly from your smartphone. Voice control compatibility with Amazon Alexa and Google Assistant adds even more convenience.

12,000 BTU System Specifications

System Type Single Zone Mini Split Heat Pump
Cooling Capacity 12,000 BTU
Heating Capacity 12,000 BTU
Voltage 115V
Coverage Area Up to 550 sq. ft.
SEER2 17.5
HSPF2-4 9.0
Refrigerant R-454B
Included Line Set 11.5 ft pre-charged Quick Connect® line set
Optional Line Set Lengths 16 ft, 25 ft, 35 ft, and 50 ft
Indoor Noise Level As low as 17.5 dB(A)
System SKU DIYS-12-HP-115A11-O

Ideal Applications

  • Bedrooms
  • Living rooms
  • Home offices
  • Garages and workshops
  • Rental properties
  • Additions and bonus rooms

Why Buy from MRCOOL DIY Direct?

MRCOOL DIY Direct specializes in MRCOOL DIY mini split systems, installation accessories, and replacement parts. We help homeowners across the country choose the right system for their space, layout, and budget.

If you're looking for a mid-size DIY mini split that balances power, efficiency, and ease of installation, the MRCOOL DIY Select 12,000 BTU Mini Split Heat Pump delivers dependable comfort without the installation cost.