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DIY 5th Gen Systems

The MRCOOL® DIY® 5th Generation mini-split is the only ductless heat pump system on the market designed for true do-it-yourself installation — no HVAC license, no vacuum pump, and no special tools required. The patented Quick Connect® line set arrives pre-charged with next-generation R-454B refrigerant, meaning you simply connect the line set and power on. Installation typically takes a few hours rather than a full day.

This collection includes everything you need for a complete single-zone DIY system: condensers (outdoor units), wall mount air handlers (indoor units), complete system bundles, and compatible R-454B line sets in multiple lengths.

Available Configurations

BTU Voltage SEER2 HSPF2-4 Coverage
9,000 115V 23.6 11.5 Up to 350 sq. ft.
12,000 115V 23.5 10.2 350–550 sq. ft.
18,000 208/230V 22.5 11.5 500–750 sq. ft.
24,000 208/230V 22.7 9.5 750–1,050 sq. ft.
36,000 208/230V 18.0 8.5 1,000–1,500 sq. ft.

What’s in This Collection

  • Condensers — Outdoor units sold separately for pairing with any compatible air handler
  • Air Handlers — Wall mount indoor units in 115V and 208/230V configurations
  • Complete Bundles — Condenser + air handler + 25ft pre-charged Quick Connect® line set
  • Line Sets — R-454B line sets in 16ft, 25ft, 35ft, and 50ft lengths with optional DIYPro® cable

Filters

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MRCOOL DIY 4th Gen 25ft 1/4x1/2 R-410A Pre-Charged Line Set for 9K-18K | DIY25-1412
$267.98 - $267.98
$267.98
$267.98 - $267.98
$267.98

MRCOOL DIY 4th Gen 25ft 1/4 x 1/2 R-410A Lineset DIY25-1412

MRCOOL
In stock

25ft 1/4" x 1/2" R-410A lineset for MRCOOL DIY 4th Gen 9K, 12K & 18K indoor units.Length: 25 ft | Liquid: 1/4" | Suction: 1/2" | R-410A compatible

$267.98 - $267.98
$267.98
$267.98 - $267.98
$267.98
MRCOOL DIY 4th Gen 16ft 1/4x1/2 R-410A Pre-Charged Line Set for 9K-18K | DIY16-1412
$235.98 - $235.98
$235.98
$235.98 - $235.98
$235.98

MRCOOL DIY 4th Gen 16ft 1/4 x 1/2 R-410A Lineset DIY16-1412

MRCOOL
In stock

16ft 1/4" x 1/2" R-410A lineset for MRCOOL DIY 4th Gen 9K, 12K & 18K indoor units. Length: 16 ft Liquid Line: 1/4" | Suction Line: 1/2" Refrige...

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$235.98 - $235.98
$235.98
$235.98 - $235.98
$235.98
MRCOOL DIY 5th Gen 50ft 3/8x5/8 R-454B Line Set with DIYPro Cable for 24K-36K | DIY50-3858C-O
$761.98 - $761.98
$761.98
$761.98 - $761.98
$761.98

MRCOOL DIY 5th Gen 50ft 3/8 x 5/8 R-454B Lineset w/ DIY Pro Cable DIY50-3858C-O

MRCOOL
In stock

50ft 3/8" x 5/8" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 24K & 36K indoor units. Length: 50 ft Liquid Line: 3/8" | Suctio...

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$761.98 - $761.98
$761.98
$761.98 - $761.98
$761.98
MRCOOL DIY 5th Gen 50ft 1/4x1/2 R-454B Line Set with DIYPro Cable for 9K-18K | DIY50-1412C-O
$688.98 - $688.98
$688.98
$688.98 - $688.98
$688.98

MRCOOL DIY 5th Gen 50ft 1/4 x 1/2 R-454B Lineset w/ DIY Pro Cable DIY50-1412C-O

MRCOOL
In stock

50ft 1/4" x 1/2" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 18K indoor units. Length: 50 ft Liquid Line: 1/4" | Suction Line: 1/...

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$688.98 - $688.98
$688.98
$688.98 - $688.98
$688.98
MRCOOL DIY 5th Gen 50ft 1/4x3/8 R-454B Line Set with DIYPro Cable for 6K-12K | DIY50-1438C-O
$675.98 - $675.98
$675.98
$675.98 - $675.98
$675.98

MRCOOL DIY 5th Gen 50ft 1/4 x 3/8 R-454B Lineset w/ DIY Pro Cable DIY50-1438C-O

MRCOOL
In stock

50ft 1/4" x 3/8" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 6K, 9K & 12K indoor units. Length: 50 ft Liquid Line: 1/4" | Suc...

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$675.98 - $675.98
$675.98
$675.98 - $675.98
$675.98
MRCOOL DIY 5th Gen 35ft 3/8x5/8 R-454B Line Set with DIYPro Cable for 24K-36K | DIY35-3858C-O
$649.98 - $649.98
$649.98
$649.98 - $649.98
$649.98

MRCOOL DIY 5th Gen 35ft 3/8 x 5/8 R-454B Lineset w/ DIY Pro Cable DIY35-3858C-O

MRCOOL
In stock

35ft 3/8" x 5/8" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 24K & 36K indoor units. Length: 35 ft Liquid Line: 3/8" | Suctio...

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$649.98 - $649.98
$649.98
$649.98 - $649.98
$649.98
MRCOOL DIY 5th Gen 35ft 1/4x1/2 R-454B Line Set with DIYPro Cable for 9K-18K | DIY35-1412C-O
$586.98 - $586.98
$586.98
$586.98 - $586.98
$586.98

MRCOOL DIY 5th Gen 35ft 1/4 x 1/2 R-454B Lineset w/ DIY Pro Cable DIY35-1412C-O

MRCOOL
In stock

35ft 1/4" x 1/2" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 18K indoor units. Length: 35 ft Liquid Line: 1/4" | Suction Line: 1/...

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$586.98 - $586.98
$586.98
$586.98 - $586.98
$586.98
MRCOOL DIY 5th Gen 35ft 1/4x3/8 R-454B Line Set with DIYPro Cable for 6K-12K | DIY35-1438C-O
$577.98 - $577.98
$577.98
$577.98 - $577.98
$577.98

MRCOOL DIY 5th Gen 35ft 1/4 x 3/8 R-454B Lineset w/ DIY Pro Cable DIY35-1438C-O

MRCOOL
In stock

35ft 1/4" x 3/8" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 6K, 9K & 12K indoor units. Length: 35 ft Liquid Line: 1/4" | Suc...

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$577.98 - $577.98
$577.98
$577.98 - $577.98
$577.98
MRCOOL DIY 5th Gen 25ft 3/8x5/8 R-454B Line Set with DIYPro Cable for 24K-36K | DIY25-3858C-O
$704.98 - $704.98
$704.98
$704.98 - $704.98
$704.98

MRCOOL DIY 5th Gen 25ft 3/8 x 5/8 R-454B Lineset w/ DIY Pro Cable DIY25-3858C-O

MRCOOL
In stock

25ft 3/8" x 5/8" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 24K & 36K indoor units. Compatible with EZ Pro systems. Length: ...

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$704.98 - $704.98
$704.98
$704.98 - $704.98
$704.98
MRCOOL DIY 5th Gen 25ft 3/8x5/8 R-454B Pre-Charged Line Set for 24K-36K | DIY25-3858-O
$525.98 - $525.98
$525.98
$525.98 - $525.98
$525.98

MRCOOL DIY 5th Gen 25ft 3/8 x 5/8 R-454B Lineset DIY25-3858-O

MRCOOL
In stock

25ft 3/8" x 5/8" pre-charged R-454B lineset for MRCOOL DIY 5th Gen 24K & 36K indoor units. Length: 25 ft Liquid Line: 3/8" | Suction Line: 5/8"...

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$525.98 - $525.98
$525.98
$525.98 - $525.98
$525.98
MRCOOL DIY 5th Gen 25ft 1/4x1/2 R-454B Line Set with DIYPro Cable for 9K-18K | DIY25-1412C-O
$501.98 - $501.98
$501.98
$501.98 - $501.98
$501.98

MRCOOL DIY 5th Gen 25ft 1/4 x 1/2 R-454B Lineset w/ DIY Pro Cable DIY25-1412C-O

MRCOOL
In stock

25ft 1/4" x 1/2" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 18K indoor units. Compatible with EZ Pro systems. Length: 25 ft Liqu...

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$501.98 - $501.98
$501.98
$501.98 - $501.98
$501.98
MRCOOL DIY 5th Gen 25ft 1/4x1/2 R-454B Pre-Charged Line Set for 9K-18K | DIY25-1412-O
$312.98 - $312.98
$312.98
$312.98 - $312.98
$312.98

MRCOOL DIY 5th Gen 25ft 1/4 x 1/2 R-454B Lineset DIY25-1412-O

MRCOOL
In stock

25ft 1/4" x 1/2" pre-charged R-454B lineset for MRCOOL DIY 5th Gen 18K indoor units. Length: 25 ft Liquid Line: 1/4" | Suction Line: 1/2" Refrigera...

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$312.98 - $312.98
$312.98
$312.98 - $312.98
$312.98
MRCOOL DIY 5th Gen 25ft 1/4x3/8 R-454B Line Set with DIYPro Cable for 6K-12K | DIY25-1438C-O
$470.98 - $470.98
$470.98
$470.98 - $470.98
$470.98

MRCOOL DIY 5th Gen 25ft 1/4 x 3/8 R-454B Lineset w/ DIY Pro Cable DIY25-1438C-O

MRCOOL
In stock

25ft 1/4" x 3/8" pre-charged R-454B lineset with DIY Pro Cable for DIY 5th Gen 6K, 9K & 12K indoor units. Length: 25 ft Liquid Line: 1/4" | Suc...

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$470.98 - $470.98
$470.98
$470.98 - $470.98
$470.98
MRCOOL DIY 5th Gen 25ft 1/4x3/8 R-454B Pre-Charged Line Set for 6K-12K | DIY25-1438-O
$303.98 - $303.98
$303.98
$303.98 - $303.98
$303.98

MRCOOL DIY 5th Gen 25ft 1/4 x 3/8 R-454B Lineset DIY25-1438-O

MRCOOL
In stock

25ft 1/4" x 3/8" pre-charged R-454B lineset for MRCOOL DIY 5th Gen 6K, 9K & 12K indoor units. Length: 25 ft Liquid Line: 1/4" | Suction Line: 3...

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$303.98 - $303.98
$303.98
$303.98 - $303.98
$303.98
MRCOOL DIY 5th Gen 16ft 3/8x5/8 R-454B Pre-Charged Line Set for 24K-36K | DIY16-3858-O
$311.98 - $311.98
$311.98
$311.98 - $311.98
$311.98

MRCOOL DIY 5th Gen 16ft 3/8 x 5/8 R-454B Lineset DIY16-3858-O

MRCOOL
In stock

16ft 3/8" x 5/8" pre-charged R-454B lineset for MRCOOL DIY 5th Gen 24K & 36K indoor units. Length: 16 ft Liquid Line: 3/8" | Suction Line: 5/8"...

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$311.98 - $311.98
$311.98
$311.98 - $311.98
$311.98
MRCOOL DIY 5th Gen 16ft 1/4x1/2 R-454B Pre-Charged Line Set for 9K-18K | DIY16-1412-O
$274.98 - $274.98
$274.98
$274.98 - $274.98
$274.98

MRCOOL DIY 5th Gen 16ft 1/4 x 1/2 R-454B Lineset DIY16-1412-O

MRCOOL
In stock

16ft 1/4" x 1/2" pre-charged R-454B lineset for MRCOOL DIY 5th Gen 18K indoor units. No vacuum pump required. Length: 16 ft Liquid Line: 1/4" | Suc...

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$274.98 - $274.98
$274.98
$274.98 - $274.98
$274.98
MRCOOL DIY 5th Gen 16ft 1/4x3/8 R-454B Pre-Charged Line Set for 6K-12K | DIY16-1438-O
$261.98 - $261.98
$261.98
$261.98 - $261.98
$261.98

MRCOOL DIY 5th Gen 16ft 1/4 x 3/8 R-454B Lineset DIY16-1438-O

MRCOOL
In stock

16ft 1/4" x 3/8" pre-charged R-454B lineset for MRCOOL DIY 5th Gen 6K, 9K & 12K indoor units. No vacuum pump required — connect and go. Length:...

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$261.98 - $261.98
$261.98
$261.98 - $261.98
$261.98
MRCOOL DIY Select Air Handler side
MRCOOL DIY Select 24K 230V White Air Handler front
$650.35 - $650.35
$650.35
$650.35 - $650.35
$650.35

MRCOOL DIY Select 1st Gen R454B 24K BTU 230V White Wall Mount Air Handler DIYS-24-HP-WMAH-230A13-O

MRCOOL

The MRCOOL® DIY® Select 24K BTU 230V Ductless Mini-Split Heat Pump Air Handler provides efficient, dependable heating and cooling for spaces up to ...

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$650.35 - $650.35
$650.35
$650.35 - $650.35
$650.35
MRCOOL DIY Select 18K BTU 230V R-454B Wall Mount Air Handler side view - DIYS-18-HP-WMAH-230A13-O
MRCOOL DIY Select 18K BTU 230V R-454B Wall Mount Air Handler front view - DIYS-18-HP-WMAH-230A13-O
$579.43 - $579.43
$579.43
$579.43 - $579.43
$579.43

MRCOOL DIY Select 1st Gen R454B 18K BTU 230V White Wall Mount Air Handler DIYS-18-HP-WMAH-230A13-O

MRCOOL

The MRCOOL® DIY® Select 18K BTU 230V Ductless Mini-Split Heat Pump Air Handler delivers efficient, reliable heating and cooling for spaces up to 80...

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$579.43 - $579.43
$579.43
$579.43 - $579.43
$579.43
MRCOOL DIY Select Air Handler side
MRCOOL DIY Select 12K 115V White Air Handler front
$478.85 - $478.85
$478.85
$478.85 - $478.85
$478.85

MRCOOL DIY Select 1st Gen R454B 12K BTU 115V White Wall Mount Air Handler DIYS-12-HP-WMAH-115A13-O

MRCOOL

The MRCOOL® DIY® Select 12K BTU 115V Ductless Mini-Split Heat Pump Air Handler delivers efficient, reliable heating and cooling for spaces up to 55...

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$478.85 - $478.85
$478.85
$478.85 - $478.85
$478.85
MRCOOL DIY Select Air Handler side
MRCOOL DIY Select 9K 115V White Air Handler front
$430.69 - $430.69
$430.69
$430.69 - $430.69
$430.69

MRCOOL DIY Select 1st Gen R454B 9K BTU 115V White Wall Mount Air Handler DIYS-09-HP-WMAH-115A13-O

MRCOOL

The MRCOOL® DIY® Select 9K BTU 115V Ductless Mini-Split Heat Pump Air Handler delivers efficient, reliable heating and cooling for spaces up to 400...

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$430.69 - $430.69
$430.69
$430.69 - $430.69
$430.69
MRCOOL DIY Select bundle white
MRCOOL DIY Select Condenser 360
$1,628.45 - $1,628.45
$1,628.45
$1,628.45 - $1,628.45
$1,628.45

MRCOOL DIY Select 1st Gen R454B 24K BTU 230V Condenser w/ 11ft Install Kit DIYS-24-HP-C-230A11-O

MRCOOL

Installing your own HVAC system is easy with the MRCOOL® DIY® Select 24K BTU 230V Ductless Heat Pump Single Zone Mini-Split Condenser, designed spe...

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$1,628.45 - $1,628.45
$1,628.45
$1,628.45 - $1,628.45
$1,628.45
MRCOOL DIY Select bundle white
MRCOOL DIY Select Condenser 360
$1,448.57 - $1,448.57
$1,448.57
$1,448.57 - $1,448.57
$1,448.57

MRCOOL DIY Select 1st Gen R454B 18K BTU 230V Condenser w/ 11ft Install Kit DIYS-18-HP-C-230A11-O

MRCOOL

The MRCOOL® DIY® Select 18K BTU 230V Ductless Heat Pump Single Zone Mini-Split Condenser is designed to make HVAC installation simple and accessibl...

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$1,448.57 - $1,448.57
$1,448.57
$1,448.57 - $1,448.57
$1,448.57
MRCOOL DIY Select bundle white
MRCOOL DIY Select Condenser 360
$1,199.95 - $1,199.95
$1,199.95
$1,199.95 - $1,199.95
$1,199.95

MRCOOL DIY Select 1st Gen R454B 12K BTU 115V Condenser w/ 11ft Install Kit DIYS-12-HP-C-115A11-O

MRCOOL

The MRCOOL® DIY® Select 12K BTU 115V Ductless Heat Pump Single Zone Mini-Split Condenser is designed to make HVAC installation simple and accessibl...

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$1,199.95 - $1,199.95
$1,199.95
$1,199.95 - $1,199.95
$1,199.95