Zone Air® Airframe DUAL ZONE 21,500 BTU (12K+9.5K) 21 SEER2 230V Ceiling Cassette Mini-Split Heat Pump System with 2x Pre-Charged Linesets - Up to 1,075 Sq Ft

A 12K and a 9.5K Ceiling Cassette on One Condenser — Right-Sized, Hidden Comfort for Two Rooms, DIY

The Zone Air Airframe dual-zone 21,500 BTU system pairs a 12,000 BTU cassette and a 9,500 BTU cassette on a single outdoor condenser, so you can right-size the comfort for two different rooms — a larger space and a smaller one — while keeping both heads recessed flush into the ceiling. Each room gets its own independent control and even 4-way airflow, and both connect with pre-charged line sets, so this mixed two-zone system installs DIY and saves you $3,000–$5,000 versus a pro job.

Each pre-charged line set comes with R-454B refrigerant for easy installation and stays factory-sealed from start to finish. You never handle refrigerant, you never need a vacuum pump, and EPA Section 608 certification requirements don't apply. With a 12,000 BTU zone plus a 9,500 BTU zone, this system heats and cools up to 1,075 sq ft total — up to 600 sq ft in the larger room and up to 475 sq ft in the smaller — perfect for pairing a living room with a bedroom, or a primary suite with an office.

Each cassette recesses up into the ceiling, so this install goes beyond a wall unit: you'll need access above each room through a drop-ceiling tile or open joist bay and clearance in the cavity. But the refrigerant work on both line sets is already done at the factory. With basic tools, a drill, and the quick-connect fittings, most homeowners complete both zones over a weekend.

Why You'll Love It

• Right-Sized, Independent Zones — A 12K cassette handles the larger room while a 9.5K cassette covers the smaller one, each with its own thermostat. You match capacity to each space and control them separately — no over-cooling a small room or under-serving a big one.
• Discreet 4-Way Airflow In Both Rooms — Both cassettes recess flush into the ceiling and distribute air in all four directions for even comfort, with no wall box and no wasted wall space — a clean architectural look across two rooms.
• Up to 21 SEER2 Efficiency — A higher SEER rating means lower bills, and at up to 21 SEER2 with Energy Star certification this mixed dual-zone system runs efficiently in both rooms. Mini-splits can save up to 30% on energy costs versus traditional HVAC.
• Cold Climate Performance — Reliable heating down to -13°F with enhanced vapor injection that maintains approximately 85% of rated heating capacity at 5°F — both rooms stay comfortable through deep winter.
• 5-Year Warranty Protection — Zone Air backs the entire system with 5-year parts and 7-year compressor coverage plus 30-day returns — peace of mind across both zones on an install you did yourself.

What Makes It Different

Mixed-capacity, two-zone cassette systems are almost always sold as pro-install jobs, with a technician vacuuming and charging both lines. The Airframe dual-zone 21K is built around pre-charged, quick-connect line sets for both cassettes, so right-sized, hidden ceiling comfort in two rooms comes without a contractor.

• Pre-Charged Line Set Technology — Both line sets arrive factory-sealed with R-454B refrigerant. Hand-connect the quick-connect fittings on each, torque to spec, and both circuits are ready. No vacuum pump, no gauges, no HVAC license — pre-charged line sets eliminate the need for HVAC licensing entirely.
• True DIY for Two Zones — Two mounting frames, detailed instructions, and video support make recessing a 12K and a 9.5K cassette a homeowner job. You will need ceiling-cavity access above each room and basic tools — a drill, wrench set, and level — and the refrigerant work on both zones is already finished.
• Cold Climate Optimization — Standard cassette systems fade below freezing; Zone Air's Airframe uses enhanced vapor injection to sustain heat to -13°F in both rooms. This is a purpose-built cold climate heat pump, not an air conditioner with a reversing valve bolted on.

How It Works

1. Frame and Mount Both Cassettes — Open access above each room through a drop-ceiling tile or joist bay, secure the 12K and 9.5K cassettes into their openings with the included mounting frames, and set the single outdoor condenser on a pad or bracket. Route each pre-charged line set up through the ceiling and connect both cassettes to the condenser with the quick-connect fittings. Testing connections with soapy water is mandatory to check for leaks before activation, and proper torque and sealing are essential for leak prevention.
2. Power and Configure — Wire the condenser to a dedicated 208–230V circuit. A licensed electrician is recommended for the electrical disconnect box to ensure code compliance and safety. Once powered, configure each zone in the smartphone app in minutes and add voice control for both rooms.
3. Independent Comfort — Each cassette heats or cools its own room on its own schedule, distributing air evenly in four directions. Ductless, zoned comfort eliminates duct losses and expensive ductwork — you condition only the rooms in use, each right-sized to its space.

Who It's For

Ideal for:

• Homeowners conditioning two differently sized rooms — one larger, one smaller — independently from a single outdoor unit
• A larger room up to 600 sq ft paired with a smaller room up to 475 sq ft, such as a living room and a bedroom
• Spaces with a drop-ceiling or accessible joist bay above each room, where both cassettes can recess flush
• DIYers who want right-sized, hidden ceiling comfort in two rooms while saving thousands on professional multi-zone installation

If you want right-sized, hidden-in-the-ceiling comfort in two differently sized rooms and an install you can complete yourself, the Airframe dual-zone 21,500 BTU system delivers. Energy-efficient mini-splits may qualify for state and utility rebates (the federal 25C tax credit ended for systems placed in service after December 31, 2025) — so the upgrade keeps paying back across years of use.