MRCOOL® E Star DIY 4th Gen 9k BTU Ductless Mini-Split Air Handler 230V/60Hz
Component — Not a Complete System
This is the indoor unit only. To run, you also need a matching outdoor condenser and a refrigerant line set. Looking for the complete system instead? Browse complete 9,000 BTU systems.
SKU DIY-09-HP-WMAH-230C25
Customize it — compatible add-ons only
Diameter matched to this unit per MrCool's spec sheet.
Clean channel for the lines running down your exterior wall.
Universally compatible tools and care items — maintenance kit, coil cleaner, install tools.
MrCool DIY factory warranty — register after install to activate the full coverage tiers.
Sizing Help
Not sure if 9K BTU is right for your space?
Proper sizing prevents short-cycling, high bills, and premature failure. Our sizing tool takes 60 seconds.
Resources
Brochures & Manuals
Description
MRCOOL® E Star DIY 4th Gen 9k BTU Ductless Mini-Split Air Handler 230V/60Hz
What's in the Box
Here's what you'll receive with your order
Wall-Mount Air Handler
Indoor ductless mini-split unit
Wireless Remote Control
Handheld remote with temperature control
Mounting Plate & Hardware
Wall mounting bracket and screws
Owner Manual
Installation and operation guide
Key Specifications
9000BTU
Cooling Capacity
Up to 375sq ft
Coverage Area
208-230V
Voltage
35dBA
Noise Level
9000BTU
Heating Capacity
MRCOOL® E Star DIY 4th Gen 9k BTU Ductless Mini-Split Air Handler 230V/60Hz — Model Details
What this specific model is sized for, how it installs, how it performs, and what it costs to run.
Room & Space Coverage — 9,000 BTU
The MRCOOL® E Star DIY 4th Gen 9k BTU Ductless Mini-Split Air Handler 230V/60Hz delivers 9,000 BTU of cooling and heating capacity, sized for spaces up to 375 sq ft in standard 8-ft ceiling rooms with average insulation. At this capacity the unit targets small rooms, nurseries, tiny homes, enclosed porches, and dedicated zones that need precise temperature control without oversizing — oversized units short-cycle, which hurts humidity control and shortens compressor life.
Power & Electrical Requirements
Power requirement: 208-230V 1-phase 60Hz (standard US residential 240V service). Minimum circuit ampacity is 3A with a maximum overcurrent protection of 15A. Wire the outdoor unit with 14 AWG copper on a dedicated 15A double-pole breaker (or single-pole at 120V), with a disconnect within sight of the condenser per NEC 440.14.
Install Difficulty — DIY-Friendly
This DIY 4th Gen Wall Mount Air Handler system ships with a pre-charged Quick Connect line set — no HVAC license, no vacuum pump, no refrigerant gauges. The pre-charged fittings use a hand-tightened mechanical seal that a homeowner completes in 15 minutes per connection. Typical install time from unboxing to first cool air is 4–8 hours for a single-head system. Ships with R-410A refrigerant. R-410A is a mature, widely-serviced refrigerant; service technicians and parts are available at any HVAC supply house.
Sound Level & Comfort Features
Operating sound level ranges from 25 dB(A) on low to 40 dB(A) on high — the low end is whisper-quiet, below a normal conversation (60 dB) and comparable to a library reading room. Quiet mode caps fan speed and compressor rpm for an extra 2–3 dB drop in sound output.
Warranty & Certifications
When you register your unit within 60 days of purchase you get Limited Lifetime Compressor on the compressor through MrCool's registered warranty program. Unregistered coverage drops to 5-year Parts / 7-year Compressor — registration takes 3 minutes at mrcool.com and is the highest-ROI post-purchase step you can take. AHRI certified — required for most utility rebate and tax credit programs.
What's in the Box & Compatibility
Ships as a Mini Split with remote control included.
Product Details
As part of a MRCOOL® DIY system, the MRCOOL® DIY 9K BTU Ductless Wall Mounted Air Handler is one of the most efficient air handlers available. Not only can it produce a 22 SEER efficiency rating it can also cover an area up to 375 sq. ft. It is also incredibly versatile and equipped with multiple operating modes, which include COOL, HEAT, AUTO, DRY (dehumidify), and SLEEP. This unit also has the capability to be controlled by your Apple or Android smartphone through the use of the Smart HVAC app. With its light and compact design, it can be installed easily to most interior walls with the included mounting plate. To take the simplicity of the installation even further, this air handler is designed to be used with MrCool’s patented Pre-Charged Quick Connect Line Set. The line set is equipped with quick connectors which give a DIY installer the ability to connect the refrigerant piping with wrenches. The line set comes from the factory pre-charged with the correct amount of R-410A refrigerant, so no vacuuming is necessary. Let the MrCool 4th Generation 9K BTU Ductless Wall Mounted Air Handler all of the heating and cooling necessities of your home.
Specifications
| Cooling Capacity | 9,000 BTU |
| Heating Capacity | 9,000 BTU |
| Voltage | 208-230 V |
| Refrigerant | R-410A |
| Noise Level | 35 dBA |
| Coverage Area | Up to 375 sq ft |
| Phase | 1 |
| Refrigerant Type | R-410A |
| Liquid Line Size | 1/4 |
| Suction Line Size | 1/2 |
Features
- SmartHVAC app: WIFI control - control your DIY anywhere with your Apple or Android smart device and an Internet connection
- Standard 7-year compressor/5-year parts warranty; register for limited lifetime compressor warranty
- Compatible with Amazon Alexa and Google Assistant
- Includes the new DIY Pro™ Cable, an added safety feature to protect the wiring from the outside elements
Frequently Asked Questions
Everything you need to know about this product
What size room will the MRCOOL® E Star DIY 4th Gen 9k BTU Ductless Mini-Split Air Handler 230V/60Hz cool?
Can I install this myself without an HVAC license?
What electrical circuit do I need for installation?
How fast does HVACZAR ship this unit?
What if it arrives damaged or I change my mind?
What is the warranty on the MRCOOL® E Star DIY 4th Gen 9k BTU Ductless Mini-Split Air Handler 230V/60Hz?
How long does shipping take?
What size room does 9,000 BTU cover?
Do you offer returns?
How can I pay?
Related Products
Ships Nationwide — Shop by State
We deliver the MRCOOL® E Star DIY 4th Gen 9k BTU Ductless Mini-Split Air Handler 230V/60Hz to all 50 states via FedEx, UPS, and truck freight. Each state page lists local rebate programs and utility incentives.