What's in the box
- 1 × MRCOOL® DIY® 9K 5th Gen Condenser — DIY-09-HP-C-115D25-O
- 1 × MRCOOL® DIY® 9K 5th Gen Air Handler — DIY-09-HP-WMAH-115D25-O
- 1 × 25 ft Quick Connect® Line Set, 1/4" × 3/8"
- 1 × MRCOOL® Remote Control
- 1 × DIYPRO® Cable
- Installation documentation
DIY-friendly installation.
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Designed for simplified installation using MRCOOL® Quick Connect® technology.
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Electrical requirements, permits, and building codes may vary by location.
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Professional electrical work may be required depending on local regulations, system placement, and installation conditions.
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Always review the product installation manual before purchase and installation.
- Base Parts Warranty: 5 Years
- Base Compressor Warranty: 7 Years
- Eligible for the MRCOOL® Care Program
Please refer to the product warranty documentation for full warranty terms, registration requirements, and coverage details.
- 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-09-HP-WM-115D25-O
Small Room Comfort Made Simple.
Need a smarter way to heat and cool a bedroom, home office, guest room, or smaller living space without the cost and complexity of traditional HVAC installation?
The MRCOOL® DIY® 5th Gen 9K BTU Mini Split System is designed to deliver efficient year-round comfort for spaces around 250–400 sq ft, making it a strong choice for smaller rooms that are too hot, too cold, or difficult to keep comfortable.
This complete single-zone system pairs a MRCOOL® DIY® 5th Gen 9K BTU wall-mounted air handler with a matching 115V condenser and included 25 ft Quick Connect® line set, helping simplify installation without traditional vacuuming.
With 23.6 SEER2 efficiency, DC inverter technology, R-454B refrigerant, quiet operation, and smart control through the SmartHVAC® app, this system gives homeowners reliable heating and cooling with greater everyday control.
Use the included remote, your smartphone, Amazon Alexa, or Google Assistant to adjust comfort with ease, while Follow Me® technology helps sense temperature around the remote for comfort where you are.
Dry Mode helps reduce humidity, Quiet Mode supports peaceful operation, and the Gold Fin® condenser coating helps protect against corrosion for long-term reliability.
Easy comfort. Smart control. Built for smaller spaces.
Why You’ll Love It
✅ Ideal for spaces around 250–400 sq ft
✅ High-efficiency 23.6 SEER2 performance
✅ Complete single-zone mini split system
✅ Includes matching air handler and condenser
✅ Includes 25 ft Quick Connect® line set
✅ 115V electrical configuration
✅ SmartHVAC® app compatibility
✅ Works with Amazon Alexa and Google Assistant
✅ Quiet indoor operation as low as 18 dBA
✅ 7-Year Compressor / 5-Year Parts Base Warranty
Best For
Bedrooms • Home Offices • Guest Rooms • Small Living Areas • Studios • Small Additions • Quiet Comfort Zones • DIY Mini-Split Installations
Need More Heating & Cooling Power?
If your space is larger, has high ceilings, large windows, poor insulation, or stronger heating and cooling demands, a larger system may be a better fit.
Explore larger MRCOOL® DIY options:
12K BTU Mini-Split Systems
18K BTU Mini-Split Systems
24K BTU Mini-Split Systems
36K BTU Mini-Split Systems
Multi-Zone Mini-Split Systems
| Specification | Details |
|---|---|
| Coverage Area | Up to 400 sq ft |
| Cooling Capacity | 9,000 BTU |
| Heating Capacity | 10,000 BTU |
| Voltage | 115V |
| Zone Type | Single Zone |
| SEER2 | 23.6 |
| EER2 | 14 |
| HSPF2-4 | 11.5 |
| HSPF2-5 | 8.6 |
| Indoor Sound Level | 18–43 dB(A) |
| Outdoor Sound Level | 54 dB(A) |
| WiFi Compatible | Yes |
| Voice Assistant | Alexa & Google Assistant |
| Inverter Technology | DC Inverter |
| Refrigerant | R-454B |
| Line Set Length | 25 ft |
| Max Line Set Length | 82 ft |
| Line Sizes | 1/4" Liquid / 3/8" Suction |
| Compressor Type | Rotary |
| Certifications | AHRI, UL, ETL, Energy Star® |
| Warranty | 7-Year Compressor / 5-Year Parts |
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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