MRCOOL DIY 5th Gen E-Star 9,000 BTU Single-Zone Mini Split System Full System Package with 25 ft. Pre-Charged Line Set 115V, DIY-09-HP-WM-115D25-O

MRCOOL DIY® 9K BTU 5th Gen Single-Zone Mini Split System

The MRCOOL DIY® 5th Generation 9,000 BTU Single-Zone Mini Split System delivers dependable, energy-efficient heating and cooling performance for spaces up to approximately 400 square feet. Built for homeowners seeking professional-grade performance with straightforward self-installation, this system delivers reliable comfort throughout the year with genuine DIY convenience.

Looking for a 6,000 BTU Single-Zone Mini Split?

MRCOOL does not manufacture a 6K BTU single-zone DIY system. However, this 9K BTU 5th Gen system is inverter-driven, meaning it automatically adjusts its output based on demand.

Unlike traditional fixed-capacity systems, the MRCOOL 9K can modulate down to lower operating levels, making it an ideal solution for spaces that would traditionally be sized at 6,000 BTU.

If you're searching for:

• 6k mini split
• 6000 BTU single zone mini split
• 6,000 BTU DIY mini split
• small room mini split system

This 9K inverter system is the correct modern replacement and provides greater efficiency, better humidity control, and improved temperature stability.

Built on MRCOOL’s proven DIY platform, the system uses MRCOOL® DIY® Quick Connect Pre-Charged Line Sets, eliminating the need for vacuum pumps, refrigerant charging, or specialized HVAC equipment. Every key component ships factory-sealed and pre-charged, so installation is achievable for anyone with basic tool experience.

Sophisticated inverter technology maintains steady indoor temperatures while minimizing energy usage. This system is ENERGY STAR® certified and uses R-454B refrigerant, an eco-conscious alternative to R-410A that satisfies current efficiency and environmental requirements without compromising performance.

Climate management is versatile and user-friendly. The system supports wireless remote operation, app-based control through the MRCOOL Smart HVAC app, and voice control via Amazon Alexa and Google Assistant. Features such as Follow Me temperature sensing and Dry Mode dehumidification allow precise comfort adjustments throughout the year.

Designed for durability, the outdoor condenser features Gold Fin® corrosion-resistant coating, ideal for coastal or high-humidity climates. Low-noise operation makes this unit well-suited for bedrooms, home offices, and other noise-sensitive spaces. Upon registration, the system is protected by the manufacturer's warranty for your confidence and protection.

This unit is an outstanding choice for bedrooms, compact living spaces, home offices, and room additions where efficient climate control, intelligent features, and self-installation are essential.

Specifications & Dimensions

At this retailer, we understand that every installation is unique, and that the standard 25-foot pre-charged line set included with MRCOOL DIY systems may not fit every installation. That’s why we offer a range of longer and customizable line set options, ensuring you receive precisely what your project requires — with no extra trips or guesswork.

How Our Line Set Options Work:

• Standard System:
  Every system from MRCOOL comes factory-bundled with a 25' pre-charged line set and 25' of control wire.

• Choosing an Alternate Length:
  If you select a different line set length (such as 16', 35', 41', 50', or 75'):

  • Your order will be custom-bundled individually at our warehouse.

  • This preparation typically requires 1–2 extra business days for preparation and shipping.

  • Your order will include the precise pre-charged line set length specified — either as a single line set or a combination of two line sets (if needed) to achieve the proper length.

📦 Important Details to Know:

• Single vs Combined Lengths:

  • 16': Factory 25' is swapped for a 16' pre-charged line set.

  • 35': A single 35' pre-charged line set is provided.

  • 41': Combines your standard 25' line set with an additional 16' line set + supplied coupler + extended control wire.

  • 50': A continuous 50' pre-charged line set is provided with longer control wire.

  • 75': Combines a 25' + 50' pre-charged line set with couplers and 75' of extended control wire.

• Control Wire Upgrade:
  Any time your line set length exceeds 25', you will receive a new longer control wire matched to the total length.

  Splicing control wires is strongly discouraged. These systems operate like sophisticated electronics — shielded, continuous control cable guarantees interference-free, corrosion-resistant performance with no future complications.

Why Shoppers Trust this retailer:

Unlike standard retail packages that require sourcing additional components, we prepare your order to specification so you have everything you need from the start.

• Everything you need arrives in one shipment.
• No need to source additional components.
• A seamless installation experience, every time.

With extensive experience specializing in DIY HVAC solutions, this retailer has established a reputation as a a leading independent HVAC dealer.
Our goal is to make DIY HVAC installation accessible, cost-effective, and hassle-free — and our custom line set bundling is just one more way we deliver on that promise.

Need help choosing the right line set length for your project?
Reach out to our team — we’re here to help you get it done right the first time!