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DIY-MULTI3-18HP230D-O
MRCOOL DIY® 5th Gen 18,000 BTU Multi-Zone Mini Split Condenser 230V
$1,555.00$1,974.85
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- 🛠️ Easy DIY Install — No Special Tools Required
- ⚡ Energy Star® Efficient Heating & Cooling
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- Description
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Description
MRCOOL DIY® 18,000 BTU Mini Split Condenser for Multi-Zone Comfort & Easy DIY Installation
The MRCOOL DIY® 5th Gen 18,000 BTU Multi-Zone Mini Split Condenser is built to deliver efficient heating and cooling across multiple rooms from a single outdoor unit. Designed for up to three indoor air handlers, this mini split condenser allows you to control different zones independently, ideal for small homes, apartments, offices, workshops, or additions.
Engineered for DIY installation, this condenser pairs with pre-charged DIY® Quick Connect® line sets, eliminating the need for vacuum pumps, refrigerant handling, or HVAC certification. With ENERGY STAR® efficiency, inverter-driven performance, and smart control compatibility, it provides reliable comfort with lower energy usage.
Important Notes and Recommended Coverage Area
- This listing includes the outdoor mini split condenser only. Indoor air handlers and line sets are sold separately.
- Designed to serve 750–1,100 sq. ft., depending on insulation quality, ceiling height, and climate zone.
Whole-Home Comfort with a Flexible Ducted Mini Split Solution
Designed to work seamlessly with MRCOOL DIY® condensers, this hybrid ducted air handler delivers efficient heating and cooling throughout your main living space while allowing additional zones to be served separately. Pair it with a wall-mounted air handler or an OuttaSight® Ceiling Cassette to independently condition a garage, office, or bonus room, giving you more control, better efficiency, and a cleaner installation without sacrificing comfort anywhere in your home.
Key Features & Benefits
Multi-Zone Heating & Cooling from One Condenser
- Supports up to three indoor air handlers with a maximum combined capacity of 24,000 BTU
- Independently control temperatures in different rooms for customized comfort
- Flexible sizing options using 6K, 9K, and 12K BTU air handlers
DIY Installation — No HVAC License Required
- Compatible with DIY® Quick Connect® pre-charged line sets
- No vacuuming, refrigerant handling, or specialized tools required
- Designed for homeowners who want professional-grade performance without professional installation
Energy-Efficient Performance with R-454B Refrigerant
- Uses R-454B, a lower-GWP refrigerant that replaces R-410A
- Inverter-driven compressor adjusts output based on demand
- ENERGY STAR® efficiency with SEER2 up to 20.5 for reduced operating costs
Smart Control Compatibility
- Control each zone using the SmartHVAC App (iOS & Android)
- Voice control compatible with Amazon Alexa and Google Assistant
- Manage comfort remotely without additional accessories
Built for Long-Term Outdoor Durability
- Gold Fin® condenser coating resists corrosion and salt air
- DIYPRO® armored cable eliminates the need for an electrical conduit
- Designed for year-round outdoor operation in demanding environments
Certified & Backed by Strong Warranty Coverage
- Intertek Listed (5031495) for safety and performance
- 7-Year Compressor Warranty
- 5-Year Parts Warranty
- Limited Lifetime Replacement Warranty with MRCOOL® Care Program registration
Compatible Air Handler Combinations
This mini split condenser supports up to three zones with flexible configurations, including:
- 6K + 6K + 12K (24,000 BTU)
- 6K + 9K + 9K (24,000 BTU)
- 6K + 6K + 9K (21,000 BTU)
- 9K + 9K (18,000 BTU – one port unused)
- 6K + 12K (18,000 BTU – one port unused)
📌 Always verify total connected BTU capacity before purchasing.
Specifications
- Model Number: DIY-MULTI3-18HP230D-O
- Cooling Capacity: 18,000 BTU/h
- Heating Capacity: 19,000 BTU/h
- Recommended Coverage Area: 750–1,100 sq. ft.
- SEER2: 20.5
- EER2: 11.5
- HSPF2-4: 10.3
- HSPF2-5: 8.5
- Power Supply: 208–230V, 60Hz, single-phase
- Minimum Circuit Ampacity: 18 A
- Maximum Fuse Size: 25 A
- Refrigerant Type: R-454B
- Refrigerant Charge: 67.37 oz
- Line Set Sizes: 3/8" liquid x 5/8" gas
- Net Dimensions (W x D x H): 37.24" x 16.14" x 31.89"
- Net Weight: 122.80 lbs
- Recommended Wire Size: 12 AWG (ideal for 18A load)
- Smaller Wire Size (Risk): 14 AWG – may overheat or fail to meet code under full load
- Larger Wire Size (Benefit): 10 AWG – reduced voltage drop and added safety margin
Frequently Asked Questions
How many indoor units can this mini split condenser support?
This condenser supports up to three indoor air handlers with a maximum combined capacity of 24,000 BTU.
Does this condenser require professional installation?
No. When paired with DIY® Quick Connect® line sets, it is designed for DIY installation without HVAC certification or special tools.
What refrigerant does this mini split condenser use?
It uses R-454B refrigerant, which has a lower global warming potential than R-410A while maintaining efficient performance.
Is this condenser compatible with smart home systems?
Yes. It works with the SmartHVAC app and supports voice control through Amazon Alexa and Google Assistant.
Best Price Guarantee!
Best Price Guarantee
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Why Buy From Us
Why Buy From Wild Oak Trail?
We’re a family-run business. My Wife Hailey and I run this business with our small staff of 3 awesome people. When you shop with Wild Oak Trail, you're supporting real people, not a big corporation.
We truly care. We’re here before, during, and after your purchase. Good products and great service—that’s how we earn your trust. We see and celebrate EVERY sale that comes in!
We choose quality. If we wouldn’t use it ourselves, we won’t offer it. Our goal is to make you happy enough to tell your friends.
Thanks for supporting our family and being part of the Wild Oak Trail community!