What's in the box
- 1 × MRCOOL® DIY® 5th Gen 36K BTU Multi-Zone Condenser
- 3 × MRCOOL® DIY® 5th Gen 9K BTU Wall-Mounted Air Handlers
- 1 × MRCOOL® DIY® 5th Gen 12K BTU Wall-Mounted Air Handler
- 4 × 25 ft Pre-Charged Quick Connect® Line Sets
- 4 × DIYPRO® Cables
- 4 × Wireless Remote Controls
- Installation Hardware
- Product Documentation
- Designed for true DIY® installation, this complete system includes patented Quick Connect® pre-charged line sets that eliminate the need for vacuum pumps or refrigerant charging during installation.
- Every indoor unit includes a DIYPRO® cable, simplifying electrical connections while providing additional protection from weather and outdoor conditions.
- Each room can be installed independently, allowing you to complete your project one zone at a time if desired.
- Always follow the installation manual and local electrical codes.
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Base Parts Warranty: 5 Years
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Base Compressor Warranty: 7 Years
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Eligible for the MRCOOL® Care Program.
Warranty coverage may depend on proper installation, product registration, and MRCOOL® warranty requirements.
- Free standard shipping is available on eligible orders to the Lower 48 states and Washington, D.C.
- Orders are generally processed within 3–5 business days, followed by approximately 5–12 business days in transit.
- Smaller items may ship by parcel carrier. Larger equipment may be delivered curbside by freight carrier, and the carrier may contact you to coordinate delivery.
- Return requests may be submitted within 30 calendar days of delivery. Products must be new, unused, uninstalled, complete and in their original manufacturer packaging. Powered products must not have been energized.
- For approved change-of-mind, incorrect-sizing or customer-ordering-error returns, the customer is responsible for return freight and a 15% restocking fee. Verified damaged, defective, incorrect or incomplete orders are handled separately.
View our Shipping Policy and Returns & Warranty Policy.
Manuals & documents
MODEL: DIY-MULTI5-36HP230D-O
Whole-Home Comfort. One Smart Solution.
Tired of one room being too hot while another never feels comfortable? Give every room in your home its own perfect temperature—all from one powerful DIY system.
The MRCOOL® DIY® 5th Gen 36K BTU 4-Zone Mini Split System is designed to bring personalized comfort to three bedrooms and a living room, allowing every space to maintain its own ideal temperature while helping reduce wasted energy throughout your home.
Built for homes up to around 1,500 sq. ft., this complete 230V multi-zone heat pump system combines one powerful 36K BTU outdoor condenser, three 9K BTU air handlers, and one 12K BTU air handler to create balanced heating and cooling where your family spends the most time. Whether it's a cool bedroom for a better night's sleep or a comfortable living room where everyone gathers, each zone operates independently for comfort exactly where you need it.
Installation is designed with homeowners in mind. Patented Quick Connect® pre-charged line sets, DIYPRO® cable, and the SmartHVAC® App make setup simpler than traditional mini split systems while giving you complete control from your smartphone, Amazon Alexa, or Google Assistant.
Powered by 23 SEER2 inverter technology and environmentally friendlier R-454B refrigerant, this system delivers outstanding efficiency, whisper-quiet operation, and dependable year-round comfort that's built to last.
One Home. Four Comfort Zones. Complete Control.
Why You’ll Love It
✅ Complete 4-zone mini split system
✅ Perfect for 3 bedrooms & 1 living room
✅ Covers homes up to around 1,500 sq ft
✅ True DIY® Quick Connect® installation
✅ 23 SEER2 high-efficiency performance
✅ Independent temperature control in every room
✅ SmartHVAC® WiFi & App control
✅ Compatible with Amazon Alexa & Google Assistant
✅ Includes four 25 ft pre-charged Quick Connect® line sets
✅ DIYPRO® cable included
✅ 5-Year Parts / 7-Year Compressor warranty
Best For
3 Bedroom Homes • Living Rooms • Family Homes • Open Plan Living • Home Renovations • New Builds • Home Additions • Homes Without Existing Ductwork • Whole Home Comfort
Important Sizing Note
This bundle has been configured for a typical home layout with three bedrooms and one living room, using one 36K BTU MRCOOL® DIY® 5th Gen Multi-Zone Condenser, three 9K BTU air handlers, and one 12K BTU air handler.
The recommended coverage of up to around 1,500 sq. ft. is a general guideline. Actual system sizing depends on factors such as room dimensions, ceiling height, insulation, climate, window area, and sun exposure.
If your home has unusually large rooms, vaulted ceilings, poor insulation, or unique heating and cooling requirements, we recommend confirming your sizing before ordering.
Need More Zones?
Need to heat and cool additional rooms or larger areas?
Consider our:
- MRCOOL® DIY® 5th Gen 5-Zone Systems
- Custom Multi-Zone Packages
- Whole Home Mini Split Solutions
Or contact our sizing team for a personalized recommendation.
| Product Type | Multi-Zone |
| Brand | MRCOOL® |
| Series | DIY® 5th Gen Multi-Zone |
| Voltage | 208/230V |
| System Capacity | 36K BTU |
| Coverage Area | Up to 1,500 sq. ft. |
| Home Layout | 3 Bedrooms + Living Room |
| Zone Type | 4 Zone |
| Maximum Zone Capacity | 5 Zones |
| Phase | 1 Phase |
| Frequency | 60 Hz |
| Outdoor Condenser | DIY-MULTI5-36HP230D-O |
| Indoor Air Handlers | 3 × DIY-09-HP-WMAH-230D25-O |
| 1 × DIY-12-HP-WMAH-230D25-O | |
| Cooling Capacity | 34,000 BTU |
| Heating Capacity | 36,000 BTU |
| Tonnage | 3 Ton |
| SEER2 | 23 |
| EER2 | 12 |
| HSPF2-4 | 9.9 |
| HSPF2-5 | 7.5 |
| Refrigerant | R-454B |
| Refrigerant Charge | 104.75 oz |
| Inverter Technology | DC Inverter |
| Compressor Type | Rotary |
| Maximum Fuse Breaker | 35A |
| Minimum Circuit Ampacity (MCA) | 30.5A |
| Quick Connect® Line Sets | Included |
| Line Set Length | 25 ft (Each) |
| Maximum Line Set Length | 221.4 ft |
| Liquid Line Size | 1/4" |
| Suction Line Size | (3/8" × 4) (1/2" × 1) |
| Outdoor Sound Level | 64 dB(A) |
| SmartHVAC® WiFi | Yes |
| App Compatible | Yes |
| Amazon Alexa | Yes |
| Google Assistant | Yes |
| DIYPRO® Cable | Included |
| Quiet Mode | Yes |
| Fan Only Mode | Yes |
| Auto Cool | Yes |
| Energy Star® Certified | Yes |
| AHRI Certified | Yes |
| ETL Listed | Yes |
| Intertek Listed | 5031495 |
| Warranty | 5-Year Parts / 7-Year Compressor |
| Outdoor Unit Dimensions (Net) | 37.24" W × 31.89" H × 16.14" D |
| Outdoor Unit Weight | 169.24 lb |
| Outdoor Unit Dimensions (Shipping) | 42.91" W × 34.84" H × 19.69" D |
| Outdoor Unit Shipping Weight | 181.88 lb |
| 9K Air Handler Dimensions (Net) | 31.57" W × 11.69" H × 7.44" D |
| 9K Air Handler Weight | 24.47 lb (Each) |
| 9K Air Handler Shipping Weight | 35.05 lb (Each) |
| 12K Air Handler Dimensions (Net) | 31.57" W × 11.63" H × 7.44" D |
| 12K Air Handler Weight | 24.47 lb |
| 12K Air Handler Shipping Weight | 35.05 lb |
| Total Shipping Weight | 322.08 lb |
Questions, answered
Everything homeowners ask before buying a MRCOOL® system.
Installation
What installation requirements apply to this product?
Installation requirements vary by product type. Selected complete MRCOOL® DIY systems are designed for homeowner installation when fitted in line with the manufacturer’s instructions, local codes and permit requirements.
Central HVAC systems, including Universal®, VersaPro®, Central Ducted Hyper Heat and packaged systems, are intended for professional installation by a qualified HVAC contractor. Licensed electrical work may also be required.
Components, thermostats, controls, line sets and accessories should be installed according to their product documentation and compatibility requirements. Always review the product page, manufacturer guidance and warranty conditions before installation.
Will I need any additional parts, tools or professional services?
Additional requirements vary by product and installation. Tools, electrical materials, mounting hardware, connecting components or other installation supplies may be required unless specifically stated as included.
Review the product description, specifications, installation information and What’s Included section, where available, before ordering.
Where can I find product documents or installation instructions?
Available specifications, installation instructions, owner’s manuals and manufacturer documents are provided on the product page where applicable.
Some simple accessories may not have a separate installation manual. Contact our team if you need help locating documentation for a particular product or model.
Sizing & Compatibility
How do I confirm this product is compatible with my equipment?
Review the product type, model number, dimensions, voltage, capacity, refrigerant type, connection sizes and compatibility information shown on the product page, where applicable.
Components, thermostats, controls and accessories must be matched to compatible equipment. Contact our team before ordering if you are uncertain about compatibility.
What should I check before ordering?
Confirm the product name and model number, together with any relevant dimensions, voltage, capacity, refrigerant type, connections and installation requirements.
For replacement components and accessories, compare the product specifications with your existing equipment and the relevant manufacturer documentation before placing your order.
What is included with this product?
The supplied items are listed in the What’s Included section or product description, where applicable. Only the products, components and accessories specifically stated are included.
Electrical materials, mounting equipment, connecting components or other installation supplies may need to be purchased separately unless expressly stated otherwise.
Warranty & Support
What warranty coverage applies to this product?
Warranty coverage varies by product and model. Eligible MRCOOL® products are covered according to the manufacturer’s warranty terms, registration requirements and installation conditions.
Accessories and individual components may have different coverage. Cool Heat Direct can provide available warranty documentation and general guidance, while warranty eligibility and claim decisions are determined by the manufacturer.
How can I get help before ordering?
Email support@coolheatdirect.com with the product name or model number and details about your project or existing equipment.
For compatibility questions, include the model numbers of any products you intend to connect, control, replace or use together.
Support hours: Monday–Friday, 9 AM–6 PM ET.
Shipping & Returns
How will my order be shipped?
Free standard shipping is available on eligible orders to the Lower 48 states and Washington, D.C.
Orders are generally processed within 3–5 business days, followed by approximately 5–12 business days in transit. Delivery timing varies by product availability, destination and carrier scheduling.
Smaller products may ship by parcel carrier. Larger equipment may be delivered curbside by freight carrier. The carrier may contact you to arrange a delivery appointment.
Can I return this product?
Return requests may be submitted within 30 calendar days of delivery. Products must be new, unused and uninstalled and, where applicable, unpowered. They must also be complete and in their original manufacturer packaging. Prior written authorization is required.
For approved change-of-mind returns, incorrect sizing or customer ordering errors, the customer is responsible for return freight and a 15% restocking fee applies.
Verified damaged, defective, incorrect or incomplete orders are handled separately under our full policy.
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Product Sizing Help
