Product Description 

MRCOOL DIY® 5th Gen 36,000 BTU Single Zone Mini Split System – High Efficiency (DIY-36-HP-WM-230D25-O)

Upgrade your home's climate control with the 5th Generation MRCOOL DIY® 36K BTU Single Zone Mini Split, designed for spaces ranging from 1,000 to 1,500 sq. ft. This powerful and energy-efficient system delivers year-round heating and coolingwhile allowing for easy DIY installation—no professional HVAC technician required.

With its pre-charged 25ft. QuickConnect® line set, DIYPRO® cable, and vacuum-free installation, you can set up your system without special tools or refrigerant handling. The environmentally friendly R-454B refrigerant offers improved energy efficiencywhile reducing Global Warming Potential (GWP)compared to older refrigerants like R-410A.

Easily customize comfort with the included wireless remote, SmartHVAC app (iOS & Android), or voice commands via Amazon Alexa & Google Assistant. Built to last, the system also features Gold Fin® corrosion-resistant technology and an industry-leading warranty for long-term peace of mind.

Key Features & Benefits:

✅ DIY Installation – No HVAC Technician Needed

• 25ft. QuickConnect® pre-charged line set for easy, vacuum-free installation.
• No need for special tools or professional expertise.

✅ Powerful Heating & Cooling for Large Spaces

• 36,000 BTU capacity perfect for 1,000 to 1,500 sq. ft. rooms.
• High Efficiency for enhanced efficiency and lower electricity costs.

✅ Advanced R-454B Refrigerant for Eco-Friendly Performance

• Lower Global Warming Potential (GWP) than R-410A.
• Improves energy efficiency while reducing environmental impact.

✅ DIYPRO® Cable – Enhanced Durability

• No need for electrical conduit, offering added protection against outdoor elements and wildlife.

✅ Smart Home Integration & Remote Control

• Control via wireless remote, SmartHVAC app (Apple & Android), Amazon Alexa, and Google Assistant.
• Follow Me Function adjusts temperature based on the remote’s location for precise comfort.

✅ Dehumidification Mode for Better Air Quality

• Dry Mode removes excess moisture, improving indoor air comfort.

✅ Gold Fin® Condenser for Longevity

• Corrosion-resistant coating ensures durability, ideal for coastal environments.

✅ Industry-Leading Warranty Coverage

• Limited Lifetime Warranty on select components.
• 7-Year Compressor Warranty and 5-Year Parts Warranty.

✅ Certified for Performance & Safety

• Intertek listed (5031495), ensuring high-quality construction and reliability.

Why Choose the MRCOOL DIY® 5th Gen 36K BTU Mini Split?

This 36K BTU single-zone mini split is designed for homeowners who need a high-performance, energy-efficient HVAC solution that’s easy to install. With no need for professional installation, eco-friendly refrigerant, smart technology, and an industry-leading warranty, the MRCOOL DIY® 5th Gen Mini Split delivers the ultimate comfort experience.

What’s Included 

• 36K BTU Condenser  DIY-36-HP-C-230D25-O

• 36K BTU Air Handler  DIY-36-HP-WMAH-230D25-O

• 25 ft. 3/8 x 5/8 Line Set DIY25-3858C-O

• Remote Control

• Communication wire 

• Wall Sleeve 

Smart Phone is NOT included. 

Short SPECIFICATION & DIMENSIONS

• Brand: MRCOOL DIY®
• Model: DIY-36-HP-WM-230D25-O
• Capacity: 36,000 BTU
• Coverage Area: 1,000-1,500 sq. ft.
• Power Supply: 230V
• Line Set Length: 25ft. QuickConnect® pre-charged line set
• Refrigerant Type: R-454B (Lower GWP)
• Control Options: Remote, SmartHVAC App, Alexa, Google Assistant
• Compressor Warranty: 7 Years
• Parts Warranty: 5 Years

 SPECIFICATIONS & DIMENSIONS

Dimensions & Weight
Condenser Dimensions	37.24 W" x 16.14 D" x 31.89 H"
Condenser Weight	152.12 lbs / 69 kg
Air Handler Dimensions	49.57 W" x 11.10 D" x 14.25 H"
Air Handler Weight	48.729 lbs / 22.1 kg
Capacity & Performance
Zone Capacity	1
Cooling Capacity	36,000 BTU
Outdoor Operating Temperature (Cooling)	-13°F - 122°F
EER2	8.5
SEER2	18
Heating Capacity	36,000 BTU
Outdoor Operating Temperature (Heating)	-13°F - 75°F
HSPF2-4	8.5
HSPF2-5	6.5
Coverage Area	1,000 to 1,500 sq ft.
Indoor Noise Level (Hi/Mi/Lo)	55.5/49.5/43.5/38.0/27.5 dB(A)
Outdoor Noise Level	60.5 dB(A)
Electrical Requirements
Voltage	208-230V
Phase	1
Cycle	60 Hz
Max Fuse Breaker	35A
Min Circuit Ampacity	33A
Refrigerant & Piping
Refrigerant Type	R-454B
Refrigerant Volume	109.70 oz
Liquid Line Size	3/8"
Suction Line Size	5/8"
Max Line Set Length	213.2 ft.
Features
Inverter	DC
Compressor Type	Rotary
Fan Only Option	Yes
Quiet Mode	Yes
Auto Cool	Yes
Wifi Compatibility	Yes
App Compatibility	Yes
Works with IOS	Yes
Works with Android	Yes
Remote Control Included	Yes
Certifications & Warranty
Certifications	UL Listed, ETL Listed, AHRI Certified
Warranty	7 Years Compressor 5 Years Parts

 

 Frequently Asked Questions

What's the difference between the 5th Gen and 4th Gen?

The 5th Gen MRCOOL DIY® Mini Split offers several key upgrades over the 4th Gen, focusing on efficiency, advanced technology, and eco-friendliness.

Here’s what’s new with the 5th Gen:

• Next-Gen R-454B Refrigerant: A more environmentally friendly refrigerant with lower global warming potential (GWP), compliant with the latest HVAC regulations.
• Higher Energy Efficiency: Improved SEER2 ratings for greater energy savings and optimized performance.
• Enhanced System Reliability: Upgraded components for better heating and cooling performance.
  
  

Can I install it myself, or do I need a professional?

The MRCOOL DIY system is designed for homeowners and doesn’t require HVAC tools. You can install the indoor and outdoor units yourself using the pre-charged Quick Connect® lines. However, a licensed electrician is required for the electrical hookup to ensure safety and code compliance.

Does it work in cold weather?
Yes. MRCOOL 5th Gen systems feature low-ambient heating and can provide reliable heat even when outdoor temperatures drop to around 5°F.

How do I know what BTU size I need for my rooms?

A general rule of thumb is 20 BTU per square foot of space. Here's a rough guide:

• 6,000 BTU = 100 - 150 sq ft
• 9,000 BTU = 150 - 350 sq ft
• 12,000 BTU = 351- 500 sq ft
• 18,000 BTU = 501 – 750 sq ft
• 24,000 BTU = 751 – 1,000 sq ft
• 36,000 BTU = 1,001 - 1,500 sq ft

Some additional factors may impact performance such as insulation, ceiling height, sun exposure and the number of appliances in the room. For assistance, contact our Product Experts

Does it heat as well as cool?

Yes. All 5th Gen models are heat pumps, providing both heating and cooling for year-round comfort.

Is it Wi-Fi compatible?

Yes. The MRCOOL SmartHVAC app allows smartphone control and works with Amazon Alexa and Google Assistant.

What is the warranty?

The MRCOOL 5th Generation DIY Mini-Split systems offer the following warranty coverage:

• 7-Year Compressor Replacement Warranty: This warranty ensures that if the compressor fails within the first seven years, MRCOOL will provide a replacement.
• 5-Year Parts Warranty: This warranty covers all parts of the system for five years from the date of purchase.

Recommended Room Types

Perfect for:

• Bedrooms
• Home offices
• Small living rooms
• Tiny homes
• Garages
• Bonus rooms
• Apartments
• Sunrooms

 

Need Help? Contact Us!

If you have any questions about the MRCOOL DIY® 5th Gen 36K BTU Mini Split System, please call us to speak with one of our Account Mamagers. They will be happy to assist you!

As always, purchase your MRCOOL parts and equipment from MRCOOL Direct, the USA’s #1 most trusted MRCOOL Authorized dealer.

 

MRCOOL® 5th Gen DIY vs Easy Pro™ 5th Gen — Which Mini-Split Is the Better Choice?

When you’re investing in a ductless mini-split system, you’re not just buying equipment—you’re buying comfort, reliability, energy savings, and warranty protection for the next decade or more.

MRCOOL® gives homeowners two powerful options: the 5th Generation DIY Series and the Easy Pro™ 5th Gen Series.

Both are designed to simplify installation and deliver efficient year-round comfort, but they are built for different types of customers and use cases.

Below is a straight-forward, expert breakdown so you can choose the system that fits your home, budget, and expectations.

 

1. Installation: DIY Game-Changer vs Semi-DIY Convenience

 

MRCOOL® 5th Gen DIY — The Only True DIY Mini-Split

The 5th Gen DIY is the industry-leading* self-installation mini-split system.

It uses MRCOOL’s pre-charged QuickConnect® line sets, filled at the factory with R-454B refrigerant.

• No vacuum pumps
• No gauges
• No refrigerant handling
• No HVAC license

Simply connect, tighten, and you’re done.

This technology is why the DIY Series is unmatched in the entire HVAC market.

Comes standard with:

• 25 ft QuickConnect® line set (extendable)
• R-454B refrigerant pre-charged
• Tools-free refrigerant system

This system can be installed in about 3–5 hours with common household tools.

MRCOOL® Easy Pro™ 5th Gen — Easier Than Traditional Systems

The Easy Pro™ uses a 16 ft Fast Connection pre-charged line set, also using R-454B.

This makes Easy Pro ideal for:

• Apartments
• Rental properties
• Light commercial installs
• Homeowners who want professional sign-off

Bottom line:

• DIY 5th Gen = No HVAC professional required
• Easy Pro 5th Gen = Very simplified install, but requires a technician

2. Energy Efficiency: The 5th Gen DIY Wins

Both systems are efficient, but the 5th Gen DIY is the performance champion.

5th Gen DIY 9K BTU

• 23.6 SEER2
• One of the most efficient ductless DIY systems available today
• Lower monthly energy use = lower operating cost for life of the unit

This matters in real dollars:

• More comfort for less energy
• Better humidity control
• Faster heating and cooling
• Higher performance in extreme climates

Easy Pro 9K BTU

• 20.2 SEER2
• Still excellent vs traditional mini-splits
• Ideal for moderate climates and budget installations

Efficiency takeaway:

If you want the lowest energy bills, the 5th Gen DIY is the clear winner.

 

3. Warranty Protection: The Biggest Difference

Here’s where MRCOOL separates casual systems from premium investment-grade HVAC.

MRCOOL® 5th Gen DIY Warranty

• Limited Lifetime Warranty
• 7-Year Compressor
• 5-Year Parts

This is industry-defining coverage—unmatched by any competitor in the DIY space.

It shows MRCOOL’s confidence in the engineering of their flagship product.

 

MRCOOL® Easy Pro Warranty

• 2-Year Compressor
• 1-Year Parts
• Registration required

It offers solid protection, but nowhere near the level of the DIY Series.

If long-term reliability matters to you — choose 5th Gen DIY.

4. Smart Features & App Control

Both systems deliver advanced comfort, but the 5th Gen DIY includes more premium features.

5th Gen DIY:

• Voice control (Alexa / Google Assistant)
• Follow Me comfort sensor
• Advanced inverter technology
• Higher cold climate performance
• Better humidity and noise reduction

Easy Pro:

• Quiet operation
• Basic app and smart features
• Excellent temperature stability

If you want technology that feels luxury, the DIY Series is a step above.

5. Line Set Length: Flexibility Matters

Space planning is a real-world problem.

DIY 5th Gen

• Standard 25 ft
• Expandable with extensions
• Perfect for multi-room or attic/basement runs
• Great for coastal or large properties

Easy Pro

• Standard 16 ft
• Fits small rooms, garages, and simple layouts

Longer lines = more flexibility and fewer compromises.

 

Which One Should You Choose?

 Choose MRCOOL® 5th Gen DIY if you want:

• True homeowner installation — no HVAC tech required
• 23.6 SEER2 efficiency or higher
• Lower monthly energy bills
• Stronger long-term reliability
• Lifetime system warranty
• 25 ft line set flexibility
• Premium smart features
• Coastal-grade durability

This is the flagship MRCOOL system.

If you want the best performance and future-proof value, choose DIY 5th Gen.

 

Choose MRCOOL® Easy Pro if you want:

• MRCOOL quality at a lower entry price
• If you want shorter line lengths (16 ft)
• A simpler installation than traditional systems
• Quiet comfort without high-end features
• Solid performance for smaller rooms or secondary spaces
• You plan to use a professional installer

 

This is the budget-friendly way to get MRCOOL performance.

 

The Bottom Line

Both the MRCOOL® Easy Pro™ and 5th Gen DIY mini-splits deliver real comfort, inverter technology, and simple installation.

 

But they are not the same class of product:

• MRCOOL® 5th Gen DIY = Premium performance, best-in-class efficiency, and industry-leading warranties.
• MRCOOL® Easy Pro™ = A more affordable way to upgrade comfort with simplified installation.

 

If you want maximum efficiency, reliability, smart features, and the strongest warranty in HVAC, the 5th Gen DIY stands alone.

If you need solid performance at a lower cost, and you don’t mind a less warranty protection, the Easy Pro is the perfect fit.

Need help sizing the right capacity (9K, 12K, 18K, 24K+)?

Call us MRCOOL DIRECT we’ll get you matched correctly—fast, accurate, and homeowner-friendly.