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

Two 18K Zones on One Condenser — a DIY Dual Zone System for Two Large Rooms

Some homes have two big spaces, not one big room and a bedroom. This dual zone system puts an 18,000 BTU head in each — a great room and a large primary suite, an open main floor and a finished basement, or a living area and a garage workshop — covering up to 1,800 square feet across the two zones from one outdoor condenser. Each head runs independently with its own thermostat, remote, and WiFi app control, so one room can hold 70°F while the other sits at 66°F or shuts off entirely.

Two pre-charged R454B linesets, priced separately at one per zone, use hand-tight quick-connect fittings, so there's no vacuum pump, no manifold gauges, and no EPA Section 608 license required. The two heads connect 36,000 BTU/h of indoor capacity to a 27,000 BTU/h inverter condenser — the top of its rated connection range, which works because two large rooms rarely peak at the same moment. Rated 24 SEER2 with heating output down to -13°F.

Why You'll Love It

• Two Large Rooms, Full-Size Heads — Each 18,000 BTU head covers up to 900 sq ft, so neither space is stuck with a 9K or 12K head that runs flat out all afternoon.
• True DIY Installation — Both linesets arrive factory-sealed with refrigerant already inside. Connect by hand, torque to spec, and check the joints — no refrigerant handling, no vacuum pump, no HVAC license.
• Most Capacity of Any Zone Air Dual Zone — 36,000 BTU/h of connected indoor capacity — the most the 27K multi-zone condenser accepts, and more than any other two-head Zone Air system.
• Cold Climate Heating — Rated heating operation down to -13°F, so both large spaces stay warm through real winters.
• 5-Year Warranty Protection — Zone Air backs both 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

Buying two separate 18K single-zone systems means two condensers on the pad, two sets of wall penetrations, and two 230V circuits. This bundle does it with one of each.

• Two Pre-Charged 18K Linesets, Sold Separately — Each line run arrives sealed with R454B inside, in the larger diameter an 18K head needs. The refrigerant circuit never opens during install.
• One Condenser, Two Big Zones — The inverter compressor shifts output to whichever zone is calling, and throttles down when only one room needs it.
• One Circuit, Not Two — A single 230V circuit on a 30A double-pole breaker powers both zones, instead of two separate circuits for two standalone systems.

How It Works

1. Mount Both Heads — Install an 18K head high on an interior-facing wall in each space, then run each pre-charged lineset through a small wall penetration to the outdoor unit location.
2. Connect and Check — Hand-thread the quick-connect couplings on both 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 18K + 18K dual zone system is for:

• Two large spaces — a great room and a primary suite, two open-plan floors, or a basement plus a workshop
• Homeowners who found a 12K head too small for the second room in a 12K+18K setup
• DIYers comfortable with a weekend project who want to skip a multi-zone installation bill
• Cold climate homes that need dependable heat in two big rooms down to -13°F

Second room smaller? The dual zone 30K (12K+18K) or 27K (9K+18K) pairs one 18K head with a smaller one.