Zone Air® DIY 3 ZONE 36,000 BTU (9K+9K+18K) 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump System - Up to 1,800 Sq Ft

One 18K Zone Plus Two 9K Zones — a DIY 3 Zone System for a Big Main Room

This 3 zone mini split puts an 18,000 BTU head in your largest space and 9,000 BTU heads in two smaller rooms — up to 1,800 square feet total (900 + 450 + 450) from a single outdoor condenser. It fits the common layout of a great room, open kitchen and living area, or finished basement with two bedrooms or offices off it. Each head runs independently with its own thermostat, remote, and WiFi app control.

Three pre-charged R454B linesets — priced separately, one per zone — keep the refrigerant circuit sealed, so there's no vacuum pump, no manifold gauges, and no EPA Section 608 license. The three heads connect 36,000 BTU/h of indoor capacity to a 27,000 BTU/h inverter condenser, the most it accepts, which works because three rooms rarely peak at once. Rated 24 SEER2 with heating output down to -13°F.

Why You'll Love It

• A Full-Size Head Where It Counts — An 18K head covers up to 900 sq ft, so the main living space is not stuck with a 12K head running flat out while two 9K heads handle the bedrooms.
• True DIY Installation — Three pre-charged linesets with hand-tight quick-connect fittings. No refrigerant handling, no vacuum pump, no HVAC license. Installing three zones yourself saves thousands versus a contracted multi-zone install.
• 24 SEER2 Efficiency — The inverter-driven condenser is rated 24 SEER2 and 10.5 HSPF2, modulating smoothly across three zones instead of cycling on and off.
• Cold Climate Heating — Rated heating operation down to -13°F, so all three zones stay warm through real winters.
• 5-Year Warranty Protection — Zone Air backs the whole system — all three heads and the condenser — with a 5-year parts and 7-year compressor warranty, plus 30-day returns on uninstalled systems.

What Makes It Different

Most multi-zone mini splits still require a technician to flare fittings, pull a vacuum on three line runs, and weigh in refrigerant. That multiplies install cost by the zone count.

• Three Pre-Charged Linesets, Sold Separately — Every line run arrives factory-sealed with R454B already inside — the 18K zone takes the larger-diameter line. Connect each head with hand tools, torque to spec, and check the joints with soapy water.
• Mixed Head Sizes, One System — An 18K head and two 9K heads share one condenser, so the big room and the small rooms each get capacity suited to them.
• One Circuit, Not Three — A single 230V circuit on a 30A double-pole breaker powers the whole system, instead of three separate circuits for three single-zone units.

How It Works

1. Mount Three Heads — Install the 18K head in the main living space and the two 9K heads in the smaller rooms, then run the three pre-charged linesets through small wall penetrations to the outdoor unit location.
2. Connect and Check — Hand-thread the quick-connect couplings on each of the three circuits, torque to spec, and test every joint with soapy water before startup.
3. Power and Pair — Wire the outdoor unit to a dedicated 230V circuit (a licensed electrician is recommended for the disconnect box), then pair each head to the WiFi app for room-by-room control.

Who It's For

This 9K + 9K + 18K system is for:

• Homes with one large main space around 900 sq ft plus two smaller rooms around 450 sq ft each
• A great room, open-plan living area, or finished basement paired with two bedrooms or offices
• DIYers comfortable with a weekend project who want to skip a multi-zone installation bill
• Cold climate homeowners who need dependable heat in every zone down to -13°F

Main room closer to 600 sq ft? The 3 zone 30K (9K+9K+12K) uses a 12K head there instead.