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 U.S. curbside delivery within the Lower 48 States on qualifying orders
- Orders ship from U.S. warehouse locations
- Delivery times may vary by destination, product availability, and carrier scheduling
- Returns are accepted within 30 days for unused, uninstalled products that meet return eligibility requirements
- Approved returns may be subject to a restocking fee
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
Do I need an HVAC technician to install this?
No. MRCOOL® DIY systems are designed for homeowner installation. The pre-charged Quick Connect® line set means there's no refrigerant handling, no vacuum pump, and no special tools or license required.
How long does installation take?
Most single-zone systems go in within a few hours: mount the indoor air handler, set the outdoor condenser, connect the pre-charged line set, and power it on.
Do I need an electrician?
The system needs a dedicated circuit. Most homeowners have a licensed electrician add the breaker and disconnect — everything else you can do yourself.
Sizing & compatibility
What BTU size do I need?
As a rule of thumb: up to 400 sq ft → 9–12K BTU, 400–600 sq ft → 12–18K, 600–1,000 sq ft → 18–24K. Use the room-size guide above and factor in insulation, ceiling height and sun exposure.
Will it heat in winter?
Yes — these are heat pumps, so they heat and cool. Many MRCOOL® systems keep heating in sub-freezing temperatures; check each model's spec sheet for its low-temperature heating range.
115V or 230V — which do I need?
9K–12K units are usually 115V (standard outlet circuit); 18K and larger are typically 230V. The voltage is shown in the product options and specifications.
Warranty & support
What warranty is included?
MRCOOL® systems carry manufacturer warranty coverage — typically 5–10 years on major components when you register your system after installation.
How do I get help choosing or installing?
Email support@coolheatdirect.com — our U.S. team replies within one business day with sizing, voltage and compatibility help.
Shipping & returns
How fast does it ship?
Most products ship in 3–5 business days with free curbside delivery in the continental U.S. The freight carrier calls to schedule your delivery.
Can I return it?
Returns are accepted within 30 days on new, unopened items in original packaging. A restocking fee may apply to HVAC equipment — we always confirm before issuing a return authorization.
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Sizing Help
