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National Mini Splits · MRCOOL equipment department

DIY Line Sets

Find DIY Line Sets by exact model, dimensions and intended equipment family. Accessories that appear similar can have different voltage, capacity, cabinet, connection or generation requirements, so verify the primary equipment model before ordering.

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MRCOOL MRCOOL DIY 75ft (50 ft + 25 ft) 3/8 x 5/8 Lineset for DIY 24K & 36K Indoor, 4th Generation, DIY75-3858C DIY75-3858C
$1,214.00
MRCOOL DIY 50ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K & 36K Indoor, 4th Generation, DIY50-3858C — MRCOOL model DIY50-3858C, product image 1
MRCOOL MRCOOL DIY 50ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K & 36K Indoor, 4th Generation, DIY50-3858C DIY50-3858C
$565.00
MRCOOL DIY 50ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, 4th Generation, DIY50-1412C — MRCOOL model DIY50-1412C, product image 1
MRCOOL MRCOOL DIY 50ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, 4th Generation, DIY50-1412C DIY50-1412C
$513.00
MRCOOL DIY 35ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K, 36K Indoor, 4th Generation, DIY35-3858C — MRCOOL model DIY35-3858C, product image 1
MRCOOL MRCOOL DIY 35ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K, 36K Indoor, 4th Generation, DIY35-3858C DIY35-3858C
$483.00
MRCOOL DIY 35ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, 4th Generation, DIY35-1412C — MRCOOL model DIY35-1412C, product image 1
MRCOOL MRCOOL DIY 35ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, 4th Generation, DIY35-1412C DIY35-1412C
$438.00
Current offer
MRCOOL MRCOOL 5th Gen 25ft 3/8 x 5/8 Pre-Charged Lineset w/ DIY Pro Cable for DIY 24K & 36K Indoor, DIY25-3858C-O DIY25-3858C-O
$613.00Compare at$729.00
You save $116.0015% off
Not sure where to begin?Open the DIY Line Sets buying checklist

Confirm whether the listing is a complete system or an individual component. Match the full model numbers, capacity, voltage, refrigerant, generation and included equipment against current MRCOOL documentation.

Plan electrical work, line sets, drainage, mounting and freight access before ordering. For multi-component systems, verify the exact approved combination—not only the family name.

Read planning guides →Ask an equipment question →
National Mini Splits knowledge network

Products, documents and practical HVAC research—connected.

Use these original research paths to frame the purchase, then verify the exact model in current MRCOOL documentation and applicable requirements for the installation address.

Live catalog connections

Compare real products in DIY Line Sets

Open all 25 products →
MRCOOL DIY 75ft (50 ft + 25 ft) 3/8 x 5/8 Lineset for DIY 24K & 36K Indoor, 4th Generation, DIY75-3858CDIY75-3858CMRCOOL DIY 50ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K & 36K Indoor, 4th Generation, DIY50-3858C — MRCOOL model DIY50-3858C, product image 1MRCOOL DIY 50ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K & 36K Indoor, 4th Generation, DIY50-3858CDIY50-3858CMRCOOL DIY 50ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, 4th Generation, DIY50-1412C — MRCOOL model DIY50-1412C, product image 1MRCOOL DIY 50ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, 4th Generation, DIY50-1412CDIY50-1412CMRCOOL DIY 35ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K, 36K Indoor, 4th Generation, DIY35-3858C — MRCOOL model DIY35-3858C, product image 1MRCOOL DIY 35ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K, 36K Indoor, 4th Generation, DIY35-3858CDIY35-3858CMRCOOL DIY 35ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, 4th Generation, DIY35-1412C — MRCOOL model DIY35-1412C, product image 1MRCOOL DIY 35ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, 4th Generation, DIY35-1412CDIY35-1412CMRCOOL 5th Gen 25ft 3/8 x 5/8 Pre-Charged Lineset w/ DIY Pro Cable for DIY 24K & 36K Indoor, DIY25-3858C-ODIY25-3858C-O

Educational content is general information, not engineering, legal, tax or installation advice. Manufacturer documentation, certified ratings and applicable requirements control.

Current department25 products
MRCOOLDIY75-3858C
MRCOOL

MRCOOL DIY 75ft (50 ft + 25 ft) 3/8 x 5/8 Lineset for DIY 24K & 36K Indoor, 4th Generation, DIY75-3858C

Model: DIY75-3858C
$1,214.00
Available to order View product details
MRCOOL DIY 50ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K & 36K Indoor, 4th Generation, DIY50-3858C — MRCOOL model DIY50-3858C, product image 1
MRCOOL

MRCOOL DIY 50ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K & 36K Indoor, 4th Generation, DIY50-3858C

Model: DIY50-3858C
$565.00
Available to order View product details
MRCOOL DIY 50ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, 4th Generation, DIY50-1412C — MRCOOL model DIY50-1412C, product image 1
MRCOOL

MRCOOL DIY 50ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, 4th Generation, DIY50-1412C

Model: DIY50-1412C
$513.00
Available to order View product details
MRCOOL DIY 35ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K, 36K Indoor, 4th Generation, DIY35-3858C — MRCOOL model DIY35-3858C, product image 1
MRCOOL

MRCOOL DIY 35ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K, 36K Indoor, 4th Generation, DIY35-3858C

Model: DIY35-3858C
$483.00
Available to order View product details
MRCOOL DIY 35ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, 4th Generation, DIY35-1412C — MRCOOL model DIY35-1412C, product image 1
MRCOOL

MRCOOL DIY 35ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, 4th Generation, DIY35-1412C

Model: DIY35-1412C
$438.00
Available to order View product details
MRCOOLDIY25-3858C-O Current offer
MRCOOL

MRCOOL 5th Gen 25ft 3/8 x 5/8 Pre-Charged Lineset w/ DIY Pro Cable for DIY 24K & 36K Indoor, DIY25-3858C-O

Model: DIY25-3858C-O
$613.00Compare at$729.00
You save $116.0015% off
Available to order View product details
MRCOOLDIY50-3858C-O Current offer
MRCOOL

MRCOOL 5th Gen 50ft 3/8 x 5/8 Pre-Charged Lineset w/ DIY Pro Cable for DIY 24K & 36K Indoor, DIY50-3858C-O

Model: DIY50-3858C-O
$662.00Compare at$788.00
You save $126.0015% off
Available to order View product details
MRCOOLDIY50-1438C-O Current offer
MRCOOL

MRCOOL 5th Gen 50ft 1/4 x 3/8 Pre-Charged Lineset w/ DIY Pro Cable for DIY 6K, 9K, & 12K Indoor, DIY50-1438C-O

Model: DIY50-1438C-O
$587.00Compare at$699.00
You save $112.0016% off
Available to order View product details
MRCOOLDIY50-1412C-O Current offer
MRCOOL

MRCOOL 5th Gen 50ft 1/4 x 1/2 Pre-Charged Lineset w/ DIY Pro Cable for DIY 9K, 12K & 18K Indoor, DIY50-1412C-O

Model: DIY50-1412C-O
$599.00Compare at$713.00
You save $114.0015% off
Available to order View product details
MRCOOLDIY35-3858C-O Current offer
MRCOOL

MRCOOL 5th Gen 35ft 3/8 x 5/8 Pre-Charged Lineset w/ DIY Pro Cable for DIY 24K & 36K Indoor, DIY35-3858C-O

Model: DIY35-3858C-O
$565.00Compare at$672.00
You save $107.0015% off
Available to order View product details
MRCOOLDIY35-1438C-O Current offer
MRCOOL

MRCOOL 5th Gen 35ft 1/4 x 3/8 Pre-Charged Lineset w/ DIY Pro Cable for DIY 6K, 9K, & 12K Indoor, DIY35-1438C-O

Model: DIY35-1438C-O
$502.00Compare at$597.00
You save $95.0015% off
Available to order View product details
MRCOOLDIY35-1412C-O Current offer
MRCOOL

MRCOOL 5th Gen 35ft 1/4 x 1/2 Pre-Charged Lineset w/ DIY Pro Cable for DIY 9K, 12K & 18K Indoor, DIY35-1412C-O

Model: DIY35-1412C-O
$510.00Compare at$607.00
You save $97.0015% off
Available to order View product details
MRCOOLDIY25-3858-O Current offer
MRCOOL

MRCOOL 5th Gen 25ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K & 36K Indoor, DIY25-3858-O

Model: DIY25-3858-O
$457.00Compare at$544.00
You save $87.0015% off
Available to order View product details
MRCOOLDIY25-1438-O Current offer
MRCOOL

MRCOOL 5th Gen 25ft 1/4 x 3/8 Pre-Charged Lineset for DIY 6K, 9K, & 12K Indoor, DIY25-1438-O

Model: DIY25-1438-O
$264.00Compare at$314.00
You save $50.0015% off
Available to order View product details
MRCOOLDIY25-1412C-O Current offer
MRCOOL

MRCOOL 5th Gen 25ft 1/4 x 1/2 Pre-Charged Lineset w/ DIY Pro Cable for DIY 9K, 12K & 18K Indoor, DIY25-1412C-O

Model: DIY25-1412C-O
$436.00Compare at$519.00
You save $83.0015% off
Available to order View product details
MRCOOLDIY25-1412-O Current offer
MRCOOL

MRCOOL 5th Gen 25ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, DIY25-1412-O

Model: DIY25-1412-O
$272.00Compare at$323.00
You save $51.0015% off
Available to order View product details
MRCOOLDIY16-3858-O Current offer
MRCOOL

MRCOOL 5th Gen 16ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K & 36K Indoor, DIY16-3858-O

Model: DIY16-3858-O
$271.00Compare at$322.00
You save $51.0015% off
Available to order View product details
MRCOOLDIY16-1438-O Current offer
MRCOOL

MRCOOL 5th Gen 16ft 1/4 x 3/8 Pre-Charged Lineset for DIY 6K, 9K, & 12K Indoor, DIY16-1438-O

Model: DIY16-1438-O
$227.00Compare at$270.00
You save $43.0015% off
Available to order View product details
MRCOOLDIY16-1412-O Current offer
MRCOOL

MRCOOL 5th Gen 16ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, DIY16-1412-O

Model: DIY16-1412-O
$239.00Compare at$284.00
You save $45.0015% off
Available to order View product details
MRCOOL 25ft 3/8 x 5/8 Pre-Charged Lineset w/ Communication Cable for DIY 24K & 36K Indoor, DIY25-3858C — MRCOOL model DIY25-3858C, product image 1
MRCOOL

MRCOOL 25ft 3/8 x 5/8 Pre-Charged Lineset w/ Communication Cable for DIY 24K & 36K Indoor, DIY25-3858C

Model: DIY25-3858C
$490.00
Available to order View product details
MRCOOL 25ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K & 36K Indoor, DIY25-3858 — MRCOOL model DIY25-3858, product image 1
MRCOOL

MRCOOL 25ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K & 36K Indoor, DIY25-3858

Model: DIY25-3858
$256.00
Available to order View product details
MRCOOL 25ft 1/4 x 1/2 Pre-Charged Lineset w/ Communication Wire for DIY 9K, 12K & 18K Indoor, DIY25-1412C — MRCOOL model DIY25-1412C, product image 1
MRCOOL

MRCOOL 25ft 1/4 x 1/2 Pre-Charged Lineset w/ Communication Wire for DIY 9K, 12K & 18K Indoor, DIY25-1412C

Model: DIY25-1412C
$457.00
Available to order View product details
MRCOOL 25ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, DIY25-1412 — MRCOOL model DIY25-1412, product image 1
MRCOOL

MRCOOL 25ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, DIY25-1412

Model: DIY25-1412
$233.00
Available to order View product details
MRCOOL 16ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K & 36K Indoor, DIY16-3858 — MRCOOL model DIY16-3858, product image 1
MRCOOL

MRCOOL 16ft 3/8 x 5/8 Pre-Charged Lineset for DIY 24K & 36K Indoor, DIY16-3858

Model: DIY16-3858
$231.00
Available to order View product details
MRCOOL 16ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, DIY16-1412 — MRCOOL model DIY16-1412, product image 1
MRCOOL

MRCOOL 16ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor, DIY16-1412

Model: DIY16-1412
$205.00
Available to order View product details
National Mini Splits resource center

Plan the complete project—not only the equipment.

Use these original guides as a starting point, then confirm the exact product manual, local requirements and qualified professional work where applicable.

01 · SizingBuild from a load calculation

Understand why climate, insulation, windows, occupancy and room use matter.

Read sizing guidance → 02 · InstallationPlan electrical, drainage and access

Review the project conditions that should be settled before equipment arrives.

Open installation planning → 03 · RefrigerantKeep generations and refrigerants matched

Do not assume indoor, outdoor or accessory components are interchangeable.

Review refrigerant changes → 04 · DocumentationSave model-specific records

Keep manuals, specifications, invoices, serials and applicable warranty terms together.

Use the document checklist → 05 · Video workshopWatch official MRCOOL demonstrations

Use product videos to supplement—not replace—the current installation manual.

Watch the video workshop → 06 · State planningVerify state and local requirements

Start with climate context and official regulatory gateways for all 50 states.

Choose a state guide →
How to shop DIY Line Sets

A precise model match saves more time than a broad category match.

Accessories are model-specific even when their names look universal. Match the accessory model to the exact indoor or outdoor equipment, generation, refrigerant, voltage, connection type and current manufacturer documentation.

Measure the route and installation conditions before selecting line sets, drainage, mounting, controls or heat kits. Confirm which parts are included with the primary equipment so the order is complete without unnecessary duplicates.

Common buying questions

DIY Line Sets FAQs

How do I know whether a listing is a complete system?

Review the product title, included-components section, product images and exact models. A family name or capacity alone does not prove that indoor and outdoor equipment are both included.

Can I match components from different MRCOOL generations?

Do not assume cross-generation compatibility. Confirm the complete combination in current MRCOOL documentation or obtain model-specific evidence before ordering.

Does square footage determine the correct system size?

No. Square footage is only one input. Climate, insulation, windows, ceiling height, orientation, occupancy and internal loads should be considered in a proper load calculation.

Where do I confirm shipping charges and delivery options?

Available shipping methods and charges are shown at checkout for the order and destination. Large equipment may require additional freight-access planning before purchase.