DIY Mini Split Systems
Built to Last.
Professional-grade ductless heating and cooling — engineered for self-installation. No vacuum pump. No contractor. No compromise.
- 9,000 BTU · small rooms & studios
- 20.5 SEER2 · 230V operation
- Heating to −13°F · cooling to 0°F
- Wi-Fi included · R32 refrigerant
- 15 ft line set + comm wire
- GWIN Tech included · A2L leak sensor
The GWIN 9,000 BTU 20.5 SEER2 230V King Single Zone ductless mini-split is a compact heating and cooling solution for bedrooms, offices, studios, and other small spaces. This complete system includes a 15 foot line set, communication wire, and GWIN Tech for Assisted DIY installation.
- 12,000 BTU · small office & studios
- 19 SEER2 · 230V operation
- Heating to −13°F · cooling to 0°F
- Wi-Fi included · R32 refrigerant
- 15 ft line set + comm wire
- GWIN Tech included · A2L leak sensor
The GWIN 12,000 BTU 19 SEER2 230V King Single Zone Ductless Mini-Split Complete System with 15 Foot Line Set, Communication Wire, and GWIN Tech is a compact and efficient heating and cooling solution for bedrooms, offices, studios, and other small spaces. Designed for dependable comfort and easy everyday use, this 230V ductless mini-split system offers efficient inverter-driven performance in a sleek wall-mounted design.
- 18,000 BTU · larger bedrooms & living areas studios
- 20 SEER2 · 230V operation
- Heating to −13°F · cooling to 0°F
- Wi-Fi included · R32 refrigerant
- 15 ft line set + comm wire
- GWIN Tech included · A2L leak sensor
The GWIN 18,000 BTU 20 SEER2 230V King Single Zone Ductless Mini-Split Complete System with 15 Foot Line Set, Communication Wire, and GWIN Tech is a powerful and efficient heating and cooling solution for larger bedrooms, living areas, offices, and open spaces. Designed for dependable comfort and easy everyday use, this 230V ductless mini-split system delivers inverter-driven performance in a sleek wall-mounted design.
- 24,000 BTU · garages , workshops & living areas
- 19 SEER2 · 230V operation
- Heating to −13°F · cooling to 0°F
- Wi-Fi included · R32 refrigerant
- 15 ft line set + comm wire
- GWIN Tech included · A2L leak sensor
The GWIN 24,000 BTU 19 SEER2 230V King Single Zone Ductless Mini-Split Complete System with 15 Foot Line Set, Communication Wire, and GWIN Tech is a powerful and efficient heating and cooling solution for large rooms, open living areas, garages, workshops, and other demanding spaces. Designed for dependable comfort and easy everyday use, this 230V ductless mini-split system offers inverter-driven performance in a sleek wall-mounted design.
- 30,000 BTU · large spaces, & living areas
- 19 SEER2 · 230V operation
- Heating to −13°F · cooling to 0°F
- Wi-Fi included · R32 refrigerant
- 15 ft line set + comm wire
- GWIN Tech included · A2L leak sensor
The GWIN 30,000 BTU 22 SEER2 230V King Single Zone Ductless Mini-Split Complete System with 15 Foot Line Set, Communication Wire, and GWIN Tech is a powerful and efficient heating and cooling solution for large rooms, open living areas, garages, workshops, and other demanding spaces. Designed for dependable comfort and easy everyday use, this 230V ductless mini-split system offers inverter-driven performance in a sleek wall-mounted design.
- 36,000 BTU · large residential spaces, & living areas studios
- 21 SEER2 · 230V operation
- Heating to −13°F · cooling to 0°F
- Wi-Fi included · R32 refrigerant
- 15 ft line set + comm wire
- GWIN Tech included · A2L leak sensor
The GWIN 36,000 BTU 21 SEER2 230V King Single Zone Ductless Mini-Split Complete System with 15 Foot Line Set, Communication Wire, and GWIN Tech is a high-capacity heating and cooling solution for large residential spaces, open living areas, garages, workshops, offices, and other demanding single-zone applications. Designed for dependable comfort and easy everyday use, this 230V ductless mini-split system offers powerful inverter-driven performance in a sleek wall-mounted design.
Use Ductless or Cassette on each card to switch handler type — features, description, and shop link update to the matching product.
- Up to 350 sq ft
- 230V single phase
- Heating to −22°F
- Ramps to 3,000 BTU
- Dirty filter alert
- Wi-Fi Included
The GWIN Emperor 9,000 BTU 26 SEER2 ductless high-wall system is a premium heating and cooling solution for smaller spaces, with operation down to −22°F and GWIN Tech for Assisted DIY installation.
- Up to 500 sq ft
- 230V single phase
- Heating to −22°F
- Gold fin coated coils
- Dirty filter alert
- Wi-Fi Included
The GWIN Emperor 12,000 BTU 24.5 SEER2 ductless high-wall system covers medium rooms with quiet, efficient performance and full DIY-ready packaging.
- Up to 750 sq ft
- 230V single phase
- Heating to −22°F
- 125V–265V range
- Dirty filter alert
- Wi-Fi Included
The GWIN Emperor 18,000 BTU 24.5 SEER2 ductless high-wall system handles larger living areas and ADUs with strong cold-climate heating performance.
- Up to 1,000 sq ft
- 230V single phase
- Heating to −22°F
- Whole small home
- Dirty filter alert
- Wi-Fi Included
The GWIN Emperor 24,000 BTU 26 SEER2 ductless high-wall system is built for whole-home or large workshop comfort with maximum single-zone output.
Choose your outdoor unit by total capacity and zone count. Every GWIN 22 Multi condenser runs down to −22°F.
- Up to 2 independent zones
- 230V single phase
- Heating to −22°F
- 22 SEER2 efficiency
- Outdoor condenser only
- All GWIN™ guarantees
GWIN 22 Multi 18k 2 Zone Multi Zone Condenser The GWIN King 22 18k 2 Zone Multi Zone Condenser is a compact and efficient outdoor heat pump designed to power up to 2 indoor zones from a single system. Built for flexibility and performance, this multi-zone ductless condenser allows independent temperature control in multiple rooms while reducing installation complexity and equipment footprint. With up to 22 SEER2 ...
- Up to 3 independent zones
- 230V single phase
- Heating to −22°F
- 22 SEER2 efficiency
- Outdoor condenser only
- All GWIN™ guarantees
GWIN 22 Multi 24k 3 Zone Multi Zone Condenser The GWIN King 22 24k 3 Zone Multi Zone Condenser is a powerful and efficient outdoor heat pump designed to power up to 3 indoor zones from a single system. Built for flexibility and performance, this multi-zone ductless condenser allows independent temperature control in multiple rooms while reducing installation complexity and equipment footprint. With up to 22 SEER2...
- Up to 4 independent zones
- 230V single phase
- Heating to −22°F
- 22 SEER2 efficiency
- Outdoor condenser only
- All GWIN™ guarantees
GWIN 22 Multi 30k 4 Zone Multi Zone Condenser The GWIN King 21 30k 4 Zone Multi Zone Condenser is a powerful and efficient outdoor heat pump designed to power up to 4 indoor zones from a single system. Built for flexibility and performance, this multi-zone ductless condenser allows independent temperature control in multiple rooms while reducing installation complexity and equipment footprint. With up to 21 SEER2...
- Up to 4 independent zones
- 230V single phase
- Heating to −22°F
- 22 SEER2 efficiency
- Outdoor condenser only
- All GWIN™ guarantees
GWIN 22 Multi 36k 4 Zone Multi Zone Condenser The GWIN King 22 36k 4 Zone Multi Zone Condenser is a compact and efficient outdoor heat pump designed to power up to 4 indoor zones from a single system. Built for flexibility and performance, this multi-zone ductless condenser allows independent temperature control in multiple rooms while reducing installation complexity and equipment footprint. With up to 21 SEER2 ...
- Up to 5 independent zones
- 230V single phase
- Heating to −22°F
- 22 SEER2 efficiency
- Outdoor condenser only
- All GWIN™ guarantees
GWIN 22 Multi 42k 5 Zone Multi Zone Condenser The GWIN King 21 42k 5 Zone Multi Zone Condenser is a high-capacity outdoor heat pump designed to power up to 5 indoor zones from a single system. Built for maximum flexibility and performance, this multi-zone ductless condenser allows independent temperature control across multiple rooms while minimizing installation complexity and outdoor equipment footprint. With u...
- Up to 5 independent zones
- 230V single phase
- Heating to −22°F
- 22 SEER2 efficiency
- Outdoor condenser only
- All GWIN™ guarantees
GWIN 22 Multi 48k 5 Zone Multi Zone Condenser The GWIN King 22 48k 5 Zone Multi Zone Condenser is a premium, high-capacity outdoor heat pump designed to power up to 5 indoor zones from a single system. Built for maximum flexibility and performance, this multi-zone ductless condenser delivers independent climate control across multiple rooms while minimizing installation complexity and outdoor equipment footprint....
DIY Multi-Zone Mini Splits:
One Outdoor Unit. Every Room.
A zone is simply a room — or any defined area that needs to be independently heated or cooled. Multi-zone systems let you connect 2 to 6 zones to a single outdoor unit, each with its own thermostat and full independent control. One compressor outside. Different temperatures in every room.
Think of it this way: your living room, master bedroom, and home office are three separate zones. Each gets its own indoor air handler, its own remote or app control, and runs at whatever temperature that person sets — completely independent of every other zone in the house.
Step 1 — Choose Your Outdoor Unit
Select your outdoor unit based on the total number of zones you need and the combined BTU of all those spaces. Every GWIN multi-zone outdoor unit operates down to −22°F — one of the widest cold-climate operating ranges of any DIY brand on the market.
- Up to 900 sq ft
- Heating to −22°F
- 2 independent zones
- All GWIN™ guarantees
- Up to 1,200 sq ft
- Heating to −22°F
- 2–3 independent zones
- All GWIN™ guarantees
- Up to 1,500 sq ft
- Heating to −22°F
- 2–3 independent zones
- All GWIN™ guarantees
- Up to 1,800 sq ft
- Heating to −22°F
- 2–4 independent zones
- All GWIN™ guarantees
- Up to 2,100 sq ft
- Heating to −22°F
- 2–5 independent zones
- All GWIN™ guarantees
- Up to 2,400 sq ft
- Heating to −22°F
- 2–5 independent zones
- All GWIN™ guarantees
Step 2 — Choose Your Indoor Air Handlers
Every zone gets its own air handler. You can mix and match both the style (high-wall, ceiling cassette, or hidden ducted) and the series (King, Emperor, or Clean Air) across different zones in the same system. A bedroom might get a quiet Emperor high-wall, while the living room runs a slim ceiling cassette — all wired back to the same outdoor unit.
— High Wall Air Handlers —
- Self-Cleaning — the evaporator coil auto-dries after each cycle, preventing mold and mildew buildup inside the unit over time
- Built-In Leak Detection — monitors for condensate issues and alerts you before water damage can happen
- Widest BTU range in the lineup — from a small 7k bedroom unit all the way to a 36k for large open spaces
- 3–5 dB Quieter than the King Series — a noticeable, whisper-quiet difference in bedrooms and offices
- Self-Cleaning + Built-In Leak Detection
- Dirty Filter Warning — the unit alerts you when the filter needs cleaning, so maintenance is never a guessing game
- The 9k unit ramps down to 3,000 BTU — ideal for small rooms where a larger unit would short-cycle and waste energy
- Everything the Emperor has — quieter operation, self-cleaning, leak detection, dirty filter warning
- Fresh Outside Air Ventilation — pulls fresh air in from outside, conditions it, and continuously cycles it through your space rather than recirculating the same stale indoor air
- The only handler in the lineup that delivers genuinely new, fresh air on every cycle — a capability most mini splits simply cannot offer
- Best choice for bedrooms, home offices, or anyone focused on indoor air quality
Alternative Air Handler Styles
Don't want a unit mounted on the wall? GWIN multi-zone systems support two additional air handler styles that can be mixed into any system alongside high-wall units — or used exclusively throughout the home.
Mounts flush in the ceiling for discreet, multi-directional airflow with virtually no visible presence. Ideal for open floor plans, living rooms, or any space where wall aesthetics matter.
Built-in condensate pump included — ceiling cassettes have an integrated pump so they drain reliably regardless of ceiling location. No exterior wall required. Install them anywhere in the ceiling.
Completely concealed in a closet, attic, or ceiling cavity, delivering conditioned air through short duct runs to standard ceiling or wall grilles. The look of traditional central air with the efficiency of a mini split.
Best choice when you want fully invisible HVAC or need to serve multiple grilles in adjacent spaces from a single zone.
Line Sets: Cut to Length. No Pre-Charge.
GWIN line sets are not pre-charged — and that's intentional. Pre-charged line sets lock you into a fixed length, leaving excess coiled behind the wall. That looks unprofessional and can affect long-term performance. GWIN's line sets cut to the exact length you need, just like a traditional HVAC installation. Clean runs. No coiled mess. No excess.
Connection is straightforward: GWIN uses flare-less easy-connect adapters that hand-tighten and torque to spec — no flare tool, no leak-prone field flares. The result is a clean, professional-quality installation every time.
This is how professional HVAC installs are done. GWIN brings that same standard to DIY — so the finished product looks like a pro was there, because in a sense, one was.
Warranty & Operating Range: Don't Skip This
A multi-zone system is one of the more significant investments a homeowner makes in their home. At this price point, two things you should never compromise on are how well the system is warranted and how far into cold weather it will actually operate.
GWIN's warranty and −22°F operating range aren't marketing talk — they're the specs that separate a system you rely on from one you're crossing your fingers with. Spending the same dollars on a system rated to −13°F when a −22°F option exists at the same price isn't savings. It's just less.
Three Ways to Build Your System
Whether you know exactly what you need or want an expert to put it together — we have a path for you.
Browse our multi-zone collections and filter by capacity, zones, and air handler style. Good starting point if you already have a clear picture of what you need.
Call our team and walk us through your home layout. We'll assemble a custom system matched to your exact rooms, BTU needs, and preferences — outdoor unit, handlers, line sets, and all.
Enter your room dimensions and the calculator recommends a complete system in minutes. No guesswork, no spreadsheets — just the right system sized correctly for your home.
