MRCOOL ACCESSORIES 3/8"-5/8"

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Welcome to the South Mini Splits collection for MRCOOL. We feature high-efficiency systems from industry leaders like MRCOOL. 

These accessible, innovative, and truly DIY-friendly units are the ideal solution for homeowners seeking to self-install, cool garages, additions, or single-zone applications without the cost of hiring a technician.

Why Choose South Mini Splits for Your MRCOOL System?

  • ✅ Wholesale Pricing: Competitive rates on top-tier HVAC equipment.
  • ✅ USA-Based Support: Expert help from sizing to post-install troubleshooting.
  • ✅ Free Shipping Over $300: Get your complete system delivered fast.

Ready to buy? Use the filters on the left to find the perfect MRCOOL system for your needs.

What is MRCOOL?

MRCOOL has carved out a unique and popular niche in the HVAC industry by pioneering the Do-It-Yourself (DIY) ductless mini-split system.

The core innovation is the use of pre-charged line sets and quick-connect fittings, which allows almost any homeowner to install a complete heating and cooling system without the specialized tools (like vacuum pumps or manifold gauges) or the professional expertise typically required for handling refrigerant. This design choice makes MRCOOL the go-to brand for reducing installation costs and bringing comfort to spaces like detached garages, sunrooms, and new home additions.

Beyond the revolutionary DIY line, MRCOOL also offers the Advantage Series for professional installation and the Olympus Series for flexible multi-zone configurations. All systems feature high SEER ratings (up to 22 SEER depending on the model), ensuring that the ease of installation does not come at the expense of energy efficiency. Furthermore, MRCOOL systems are designed as effective heat pumps, with many models capable of operating efficiently for heat generation in freezing conditions, providing year-round comfort.

DIY-Friendly Installation and Valid Warranty

The most significant benefit of the MRCOOL DIY series is its unique warranty structure. Unlike most competitor mini-splits, the MRCOOL DIY limited warranty remains valid even when the system is installed by the homeowner, provided the installation follows the manufacturer's instructions. This eliminates the friction point between DIY installation and standard HVAC warranty requirements. The company also offers a pathway to an Extended Limited Lifetime Compressor Warranty for DIY models through enrollment in their MRCOOL Care Kit Program, ensuring long-term protection for your investment.

Mini Split BTU Sizing & Application Guide

Use our quick reference chart to match your room size with the ideal system capacity.

Capacity Sq. Footage Application
6,000 BTU150–250Small bedrooms & offices
9,000 BTU250–450Standard bedrooms
12,000 BTU450–600Kitchens & studios
18,000 BTU600–1,000Living rooms & garages
24,000 BTU1,000–1,200Open floor plans
36,000 BTU1,500–1,700Commercial & fitness
48,000 BTU1,900–2,100Large warehouses
60,000 BTU2,400–2,800+Commercial estates

When to "Size Up"

High Ceilings (10ft+)

If your ceilings are 10 feet or higher, you are cooling a larger volume of air. We recommend increasing your BTU choice by 20%.

Poor Insulation

For older homes or buildings with single-pane windows, opt for the next size up to ensure the unit can maintain the set temperature.

Kitchen Environments

Appliances generate significant heat. If the unit is for a kitchen, add 4,000 BTUs to your square footage calculation.

Heavy Sun Exposure

Rooms with large south-facing windows or "sunrooms" act like greenhouses. Increase your BTU capacity by 10-15%

Occupancy

If the area regularly hosts more than two people (like a conference room or classroom), add 600 BTUs per additional person..

Need Help Sizing?

If you aren't sure which unit is right for your project, use our BTU Calculator or contact our USA-based support team for a custom recommendation.

Open BTU Calculator

Frequently Asked Questions

A: The MRCOOL DIY series is easy because it uses pre-charged refrigerant line sets with specialized quick-connect fittings. This eliminates the need for expensive HVAC tools, such as a vacuum pump, and means the homeowner never has to handle or charge refrigerant, simplifying the entire setup.

A: No. The MRCOOL DIY Series is unique in that its warranty is explicitly valid for self-installation, provided you follow the included instructions and local electrical codes. A state-certified HVAC contractor is not required.

A: The MRCOOL Care Kit Program is a subscription service that provides the registered owner with a DIY cleaning kit every six months. Enrollment in this program is a requirement to qualify for the Extended Limited Lifetime Compressor Replacement Warranty on DIY models.

A: Yes. MRCOOL systems boast high SEER ratings, with some models reaching up to 22 SEER, which ensures substantial energy savings. Many units are designed to function as effective heat pumps, providing reliable heating performance even in low ambient temperatures, some as low as -13°F.

A: Some smaller, single-zone MRCOOL DIY units (typically 9k and 12k BTU) operate on a standard 115V power supply, which can make installation simpler. Larger units and all multi-zone condensers require a 230V connection and a dedicated breaker, similar to traditional HVAC systems.