A safe outdoor-unit support
Use a suitable pad, wall bracket, or other approved support for the equipment and site.
Compare mounting choicesMRCOOL
MRCOOL R-454B Pre-Charged Line-Set Extensions for 9k/12k DIY Systems
Ready to orderMRCOOL R-454B Pre-Charged Line-Set Extensions for 9k/12k DIY Systems
Regular price
$227.00 USD
Regular price
$278.99 USD
Sale price
$227.00 USD
Shipping calculated at checkout.
Quantity
Online ordering is paused for this option
Not offered in the initial OffGridHVAC catalog.
Ask about timingNeed more distance between the indoor and outdoor units? These pre-charged R-454B extensions come in 16, 25, 35, and 50 ft lengths for compatible 9k and 12k MRCOOL DIY systems.
The extension joins the line set that came with your system; it does not replace it with one continuous line. Match the indoor and outdoor model numbers first, then confirm the couplers, control wire, and total length allowed by the manual.
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.
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1. The size
A heating and cooling load calculation should show that the space needs about BTU. Square footage alone cannot make that call.
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2. The circuit
This is a V system. Have the circuit checked for this system.
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3. The route
The selected option covers ft. Measure the real path, including bends and service room.
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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.
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5. The locations
Make room for airflow, drainage, weather protection, service access, and a safe outdoor-unit support.
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?
- 1Check everything before you start
Make sure the size, circuit, unit locations, line route, drainage, and local requirements all work together.
- 2Check the delivery
Match the indoor unit, outdoor unit, selected line-set option, and documented package contents.
- 3Mount and route
Secure both units, create the wall path, protect the lines, and give condensate a reliable way out.
- 4Complete the electrical work
Follow the manual for your system and local electrical requirements.
- 5Start 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 needsFinish the installationWhich accessories do you actually need?
Line protection
Protect exposed refrigerant lines, control wire, and drain where the installation calls for it.
See line-set coversA compatible line-set extension
Measure first. Longer is not automatically better, and maximum length still applies.
See compatible extensionsElectrical protection and disconnect
Use the installation manual for this system and the electrical requirements for your location.
Review installation accessoriesThe full buying guideWhy might you choose—or skip—this system?
Need more distance between the indoor and outdoor units? These pre-charged R-454B extensions come in 16, 25, 35, and 50 ft lengths for compatible 9k and 12k MRCOOL DIY systems.
The extension joins the line set that came with your system; it does not replace it with one continuous line. Match the indoor and outdoor model numbers first, then confirm the couplers, control wire, and total length allowed by the manual.
