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DIY 4 Zone Mini Splits
ONE OUTDOOR UNIT. FOUR COMFORTABLE ROOMS.
DIY 4 Zone Mini Splits
A 4 zone mini split heats and cools four rooms using one outdoor unit connected to four indoor units. Each room has its own temperature setting, so everyone can stay comfortable.
Choose the right size and style for each room, then select the connection length you need. We’ll help you find options that work together.
Wall mount and OuttaSight ceiling options available.
Image is for illustration. Included equipment and accessories depend on your selections.
One outdoor unit. Heating and cooling for four rooms.
Each room has its own MRCOOL indoor unit and temperature setting. The illustration shows winter heating; the system also cools all four rooms. Each indoor unit connects to the same outdoor unit with its own pair of DIY connection lines. In this illustration, Room 1 uses the lowest connection pair, followed by Rooms 2, 3 and 4 moving upward. The king valve is shown separately above the room connections.
DIY® 5TH GEN · FOR FOUR ROOMS
Four rooms. Your combination.
Start with the size each room needs. Choose a wall or ceiling style, a matching outdoor unit, and a connection length for each room.
1Choose the size for each room
Before you choose
Consider each room separately. Room size, ceiling height, insulation, windows and local weather affect how much heating and cooling you need.
Approximate coverage for wall-mounted units
| Indoor unit size | Approximate room coverage |
|---|---|
| 6K | 200 sq ft |
| 9K | 400 sq ft |
| 12K | 550 sq ft |
| 18K | 800 sq ft |
| 24K | 1,050 sq ft |
| 36K | 1,550 sq ft |
Coverage is a rough sizing guide, not a guaranteed result or a minimum room size. These estimates are for wall-mounted units. When all four rooms are running, they share the outdoor unit’s available heating or cooling power.
Choose four room sizes, such as 6K + 6K + 6K + 6K. “K” means 1,000 BTU, a measure of heating and cooling power.
Start with Room 1, then choose a size for each remaining room. The next room’s choices adjust to supported combinations. If you change an earlier room, review the sizes selected for the rooms that follow.
Room size requirements
Small-room safety check: MRCOOL also sets a minimum floor area for the room where an indoor unit is installed. This is a separate refrigerant-safety requirement, based on the selected system and how high the indoor unit is installed. For example, “about 200 sq ft of coverage” does not mean the room must be at least 200 sq ft.
Before ordering for a small room, ask us to check your room dimensions, installation height, equipment choices and connection lengths against MRCOOL’s requirements.
Find the exact requirements: Look for “For R454B Refrigerant Charge Amount and Minimum Room Area.” The column marked Amin gives the required minimum floor area.
2Choose a style for each room
Wall mount
Mounts high on the wall and directs warm or cool air into the room. A familiar, space-saving choice for bedrooms, offices and living areas.
OuttaSight ceiling
Fits neatly into the ceiling for a discreet look and more open wall space. Requires enough space above the ceiling for installation and access.
Choose the same style for all four rooms or mix them. OuttaSight is available here in 6K, 9K, 12K and 18K sizes. Check ceiling space and water-drain routing before choosing this style.
3Choose a matching outdoor unit
Every outdoor unit shown works with your four selected room units. “Up to 4–6 rooms” describes how many rooms it can connect to. Ask us to confirm the best size for your home.
4Choose a connection length for each room
Measure the full path from each room’s indoor unit to the outdoor unit, including bends and changes in height. These connection kits include the prefilled tubing needed to connect the units. We match the connections to your selected room size.