How to Install a Ductless Mini Split: Step-by-Step Guide

Installing a ductless mini split system is a manageable project for experienced DIYers, especially with the MRCOOL DIY series which features pre-charged line sets that eliminate the need for a vacuum pump and refrigerant charging equipment.

Tools You'll Need

• Drill with hole saw (2.5–3 inch)
• Level and stud finder
• Wire stripper and electrical connectors
• Torque wrench (for traditional systems)
• Vacuum pump and manifold gauges (for non-pre-charged systems)

Step 1: Choose the Right Location

Mount the indoor air handler on an exterior wall, high up near the ceiling for optimal airflow. Ensure there are no obstructions within 6 inches of the unit and that the wall can support the unit's weight.

Step 2: Mount the Bracket and Run the Line Set

Use a level to mount the wall bracket securely into studs. Drill the pass-through hole at a slight downward angle toward the exterior to ensure proper condensate drainage.

Step 3: Connect and Start Up

Connect the line set, electrical connections, and drain line per the manufacturer's instructions. For MRCOOL DIY systems, simply connect the pre-charged quick-connect fittings — no tools required.

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