MRCOOL
MRCOOL DIY Select 1st Gen - R454B - 9K BTU 115V Black Wall Mounted Air Handler - with 13' Communication Cable
DIYS-09-HP-B-WMAH-115A13-O
9,000 BTU · 115V · R-454B
Part of DIY Select – Air Handlers
- Cooling capacity
- 9,000 BTU0.75 tons
- Room size
- 400 sq ft
- Power
- 115V15A breaker
- Refrigerant
- R-454B
- Install
- DIYPre-charged, no vacuum
$358.91 each
Not sure about the size? Use the BTU sizing calculator, or call us and we'll size it with you. This is a DIY system: the pre-charged line set connects without a vacuum pump or gauges.
Build a multi-zone system with this air handler →
Distributor pricing and stock: call 678-467-5515 or email sales@discountkings.net.
About this product
The MRCOOL® DIY® Select 9K BTU 115V Ductless Mini-Split Heat Pump Air Handler in black is designed to deliver efficient, dependable heating and cooling for spaces up to 400 square feet. Its sleek, modern finish and compact design make it a natural fit for bedrooms, home offices, studios, garages, and other small living areas. Whether enhancing an existing room or adding comfort to a new space, it provides consistent year-round performance while helping reduce energy usage and utility costs. Engineered as part of the MRCOOL® DIY® lineup, this system is built for true do-it-yourself installation. It pairs with Quick Connect® line sets that come factory pre-charged with R-454B refrigerant, eliminating the need for vacuum pumps, specialized tools, or refrigerant handling. This significantly simplifies installation, saving time and reducing overall project costs. The included 13-foot DIYPRO® cable further streamlines setup by removing the need for electrical conduit while protecting wiring from moisture, pests, and outdoor exposure. Control is simple and flexible with the included remote or the MRCOOL® Comfort app, allowing users to adjust settings, create schedules, and monitor energy use from anywhere. Voice control compatibility with Amazon Alexa and Google Assistant adds convenience. Comfort features like Dry Mode, Sleep Mode, and Auto Mode help maintain a balanced indoor environment while optimizing efficiency. This system is made for long-term durability. Backed by a 2-year compressor and 1-year parts warranty, it offers a reliable, cost-effective comfort solution.
Documents & manuals
Specifications
| Type | Air handler (indoor unit) — heat pump (heats & cools) |
|---|---|
| Series | DIY Select |
| Cooling capacity | 9,000 BTU |
| Nominal size | 0.75 tons |
| Zones | Single zone |
| Coverage | 400 sq. ft. |
| Airflow | 312.0 / 235.4 / 170.7 / 135.4 CFM |
| Sound level | 18–43 dBA |
| Voltage | 115V |
|---|---|
| Phase | 1-phase |
| Min. circuit ampacity (MCA) | 3 A |
| Max. breaker (MOP) | 15 A |
| Wi-Fi / app control | Yes |
| Refrigerant | R-454B |
|---|---|
| Liquid line | 1/4" |
| Suction line | 3/8" |
| Installation | DIY — pre-charged quick-connect line set, no vacuum pump needed |
| Dimensions (in) | 28.7 W × 7.87 D × 11.5 H |
|---|---|
| Weight | 23.81 lb |
| Shipping weight | 33.95 lb |
| Color | Black |
| Parts warranty | 1 years |
|---|---|
| UPC | 840433619918 |

