Zone Air® Thin-Air DUAL ZONE 20,500 BTU (11K+9.5K) 19 SEER2 230V Concealed Mini-Split Heat Pump System - Up to 1,025 Sq Ft

Two Hidden Zones, Mixed Sizing — 20,500 BTU of Invisible DIY Comfort

The Zone Air 20,500 BTU dual-zone concealed-ducted system pairs an 11,000 BTU and a 9,500 BTU hidden air handler on a single outdoor condenser, so you can match a larger room and a smaller room without buying two systems — and save the $3,000–$5,000 a contractor would charge. Each slim handler tucks above the ceiling, in a soffit, or in a closet and feeds short duct runs to discreet vents, leaving both rooms looking fully built-in with only low-profile grilles on display.

Two pre-charged R-454B line sets arrive factory-sealed with quick-connect fittings, keeping this true DIY on the refrigerant side — no vacuum pump, no gauges, no EPA Section 608 license. You mount the two hidden handlers and connect the short ducts and vents while the refrigerant circuits stay sealed throughout. Rated for up to 1,025 sq ft across two zones (550 + 475 sq ft), the mixed capacities are ideal for a living room paired with a bedroom, or a primary suite plus a smaller office.

A dual-zone concealed install is more involved than a single unit, but it remains a homeowner project. With a drill, a level, basic hand tools, and clear instructions, you can position both slim handlers and connect their short ducts. The two pre-charged line sets take the hardest, most technical part of the install off your plate on both zones.

Why You'll Love It

• Two Independently Controlled Zones — An 11,000 BTU handler and a 9,500 BTU handler each serve their own room and are controlled separately, so you can right-size a larger room and a smaller room and run them independently from one outdoor condenser.
• Completely Invisible Comfort — Both handlers hide above the ceiling, in soffits, or in closets and feed short ducts to discreet vents. No wall cassettes, no ceiling boxes — just clean, built-in rooms showing only low-profile grilles.
• Up to 19 SEER2 Efficiency — SEER measures cooling efficiency, and a higher rating means lower bills. At up to 19 SEER2 this dual-zone system runs efficiently across both rooms, and mini-splits can cut energy bills by up to 30% versus older equipment.
• Cold Climate Performance — Reliable heating down to -13°F with Energy Star certification. Enhanced vapor injection technology maintains approximately 85% of rated heating capacity at 5°F, keeping both hidden zones comfortable through deep winter.
• 5-Year Warranty Protection — Zone Air backs this system with comprehensive coverage — 5-year parts and 7-year compressor warranty — plus 30-day returns for total security and peace of mind.

What Makes It Different

A mixed-capacity two-zone concealed install is exactly the kind of custom job contractors price highest — two differently sized hidden handlers, two duct runs, and two refrigerant circuits to charge and vacuum. Zone Air ships both line sets pre-charged and factory-sealed, so the invisible, right-sized result across two rooms is something you can do yourself.

• Pre-Charged Line Set Technology — Both line sets arrive factory-sealed with R-454B refrigerant. Hand-tighten the quick-connect fittings on each zone, torque to spec, and the refrigerant side is done. No vacuum pump, no gauges, no HVAC license — pre-charged line sets eliminate the need for HVAC licensing entirely.
• Right-Sized Hidden Zones, Truly DIY — An 11,000 BTU handler and a 9,500 BTU handler on one condenser let you match each room to its load while keeping the work homeowner-friendly: mount each handler, connect short ducts to the vents, and snap together each pre-charged line with step-by-step instructions and video support.
• Cold Climate Optimization — Unlike standard mini splits that fade below freezing, this is a purpose-built cold climate heat pump using enhanced vapor injection to sustain heating output down to -13°F across both zones — not an air conditioner with a reversing valve bolted on.

How It Works

1. Mount and Duct Both Zones — Secure each slim concealed handler above the ceiling, in a soffit, or in a closet and connect short duct runs to the discreet vents in each room. Route both pre-charged line sets to the single outdoor condenser and join each with its quick-connect fittings. Testing every connection 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 WiFi and set up each zone in the smartphone app in minutes.
3. Invisible Two-Zone Comfort — The larger and smaller hidden handlers each condition their own room while all the equipment stays out of sight. Control each zone independently for tailored, right-sized comfort, with a built-in look and nothing on display.

Who It's For

Ideal for:

• Homeowners pairing a larger room and a smaller room who want comfort they can feel but never see — no wall or ceiling units on display
• Budget-conscious owners who want a high-end, built-in, right-sized two-zone concealed system without paying thousands for professional installation
• A living room plus bedroom, a primary suite plus office, or any large-and-small pair up to 1,025 sq ft total needing independent control
• Cold climate residents who want reliable winter heat in two differently sized rooms from one hidden, ductless-free-looking system

If you want invisible comfort in two right-sized rooms, independent zone control, and the satisfaction of installing your own system, this 20,500 BTU dual-zone setup fits your needs. 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) — for savings across years of use.