COSTWAY 30k Quad 4 Zone Mini Split Air Conditioner, 23 SEER2, 9k+9k+9k+18k BTU, 208-230V, Wifi Enabled Multi Zones Mini Split AC Heat Pump Full Set, Ductless Energy Star

30k Quad 4 Zone Mini Split Air Conditioner, 23 SEER2, 9k+9k+9k+18k BTU, 208-230V, Wifi Enabled Multi Zones Mini Split AC Heat Pump Full Set, Ductless Energy Star

Features

  • Multi-room Cooling Solution: Designed to cool any corner of your home, this 30000 BTU 4 zone(9000 BTU+9000 BTU+9000 BTU+18000 BTU) mini split air conditioner can dependently adjust the temperature to meet the individual needs of different rooms. The chassis heating function maintains the normal operation of the outdoor unit, enabling it to withstand any climate conditions (-13℉~125℉).
  • Less Energy Consumption, Lower GWP: This energy star certified mini split ac features an innovative inverter technology, operating at a remarkable 23 SEER2 rating and 10 HSPF2 rating. The use of R32 refrigerant brings you a greener lifestyle. Moreover, it is also certified by ETL and AHRI.
  • Multiple Functions & Modes: This ductless mini split air conditioner offers 6 modes (auto/cool/heat/dry/fan/sleep) and 5 wind speeds (auto/low/mid/high/strong) for you to choose from. Other features such as auto swing, feeling and health extend comfort to daily use.
  • Smart Control, Smart Life: You can easily adjust settings, monitor performance and control your AC from anywhere via your smartphone or the remote control. In addition, the 24-hour timer allows you to plan your climate control around your schedule conveniently.
  • Low Noise & Easy Maintenance: With the quiet sleep mode and screen off function, you can enjoy a restful night. In addition, the filter can be easily removed and cleaned. Please note: A professional HVAC installer is required.

Specifications

Energy Efficiency Class 23 SEER2
Color White
Size Quad (4) Zone 9k+9k+9k+18k BTU

A 30,000 BTU multi-zone ductless mini-split heat pump that provides independent heating and cooling for four indoor zones (9k+9k+9k+18k BTU) and operates on 208–230 V. It uses inverter technology with 23 SEER2 and 10 HSPF2 ratings, R32 refrigerant, multiple operating modes and fan speeds, Wi‑Fi and remote control, low-noise sleep mode, and a chassis heating feature to enable outdoor-unit operation down to -13°F; professional HVAC installation is required and the unit is ETL-, AHRI- and Energy Star–certified.

Model Number: 42bbd9cd-5ccc-433e-a3af-6b9c4dd7efff

COSTWAY 30k Quad 4 Zone Mini Split Air Conditioner, 23 SEER2, 9k+9k+9k+18k BTU, 208-230V, Wifi Enabled Multi Zones Mini Split AC Heat Pump Full Set, Ductless Energy Star Review

4.5 out of 5

A four‑room climate solution that punches above its class

Four rooms, one outdoor unit—that’s what drew me to the Costway quad‑zone mini split. I needed independent control in a small home office, two bedrooms, and a larger living area without tearing into walls for ductwork. After a full season of cooling and a handful of chilly mornings using heat, this system has proven to be a capable, efficient, and mostly quiet multi‑zone package with a few installer‑kit quirks worth knowing about.

What you get

This is a 30,000 BTU, four‑zone system with three 9,000 BTU indoor heads and one 18,000 BTU head, all fed by a single outdoor condenser operating on 208–230 V. The inverter compressor carries a 23 SEER2 cooling rating and 10 HSPF2 for heating—strong numbers for a multi‑zone kit. It runs R32 refrigerant (lower GWP than R410A), and the unit is Energy Star, ETL, and AHRI certified.

Control options include standard remotes for each head and Wi‑Fi connectivity for smartphone control. Modes are what you’d expect—auto, cool, heat, dry, and fan—plus a sleep mode, five fan speeds, auto‑swing louvers, and an “I‑Feel”/follow‑me function that uses the remote as a temperature probe.

A small but meaningful detail: the outdoor unit has chassis heating, which helps it run in low ambient conditions (rated down to –13°F). That matters if you intend to lean on heat in shoulder seasons or mild winters.

Installation and setup

I strongly recommend a licensed HVAC installer for this system. You’ll need proper line‑set routing, flaring, evacuation, pressure testing, and electrical work to pass code. I handled site prep and mounts and brought in a pro for the refrigerant circuit and final commissioning.

A few practical notes from my install:

  • Line sets: The kit includes 16‑foot line sets for each indoor head. That’s fine if your rooms are near the condenser and on the same wall run, but it’s limiting in real‑world layouts. I needed a 25‑foot and a 30‑foot run for two heads and purchased longer pre‑insulated line sets to suit. Plan your routing up front and don’t force a tight radius to “make it work”—you’ll regret the pressure drop and potential leaks.

  • Mounting hardware: The indoor mounting plates are serviceable but on the thin side. On a perfectly flat wall they’re fine; on wavy plaster or shiplap you’ll want to shim or use additional anchors to eliminate any top‑gap and keep the units flush. I swapped the provided anchors for heavy‑duty toggles on one wall and was happier with the fit.

  • Wiring: This is a 208–230 V system and requires appropriately sized conductors, a dedicated breaker, and proper disconnect. The bundled communication/power cable between heads and condenser is adequate for short runs, but I used thicker, outdoor‑rated cable for longer pulls to keep voltage drop in check. Always follow the nameplate and install manual for gauge and breaker sizing.

  • Drainage: Each head has a gravity drain. If your run can’t slope continuously, plan on a condensate pump. Test every drain with a cup of water before buttoning up.

Once installed, pairing the Wi‑Fi controls was straightforward. The app recognized each head, let me name rooms, and provided basic scheduling that has worked reliably.

Performance and comfort

Cooling performance is the star here. Even on 90°F days, the 18k head handled my open living/kitchen zone, while the 9k heads easily maintained bedroom setpoints. The inverter ramps gently, so instead of a hard on/off blast you get steady, measured cooling that keeps humidity in check. In dry mode, the system removed moisture without overchilling rooms—handy during muggy afternoons.

Heating has been solid in my climate (high 20s to low 40s°F overnight). The compressor’s low‑ambient capability kept output steady, and the chassis heater prevented nuisance frosting. You’ll still feel periodic defrost cycles in sub‑freezing weather—air briefly cools and fan speeds adjust—but recovery was quick. As with all heat pumps, expect reduced capacity as temperatures approach the rating floor; I treat it as primary heat in shoulder seasons and a supplement in deeper winter.

Air distribution is excellent. The auto‑swing louvers and the five fan speeds make it easy to prevent drafts at a desk while still throwing air across a longer room. I particularly like the “follow‑me” feature: using the remote as the temperature sensor avoids overcooling when the head is installed high on a warm wall.

Noise and day‑to‑day use

Indoors, all four heads are quiet in low and medium fan settings—conversation‑level or softer. On high, you’ll hear air rush but not much mechanical whine. Sleep mode dims the display (or turns it off entirely) and lowers fan speed; I was comfortable sleeping with the heads running.

Outdoors, the condenser is impressively tame. With a simple sound meter, I measured low‑40s dB at a few feet in heating mode and mid‑40s in cooling. The tone is low and non‑intrusive; I placed the unit near a bedroom window without complaints.

Filters slide out from the top of each head and rinse clean under a tap. I set a reminder to check them monthly during peak season. The coil fins stayed clean with the supplied filters, and the casings wipe down easily.

Controls and app

The handheld remotes are simple, with direct access to modes, fan speeds, and louver control. The Wi‑Fi app adds scheduling, room naming, and remote access. I found schedules reliable—wake/wind‑down routines worked without hiccups—and adjustments registered quickly. There’s no advanced energy dashboard, but basic runtime visibility and setpoint control are there.

One tip: enable the display‑off setting for bedrooms; the segment display is bright at night. Also, avoid bouncing between cool and heat modes in quick succession—give the system a few minutes to settle to protect the compressor.

Efficiency and operating costs

At 23 SEER2 and Energy Star certification, this system is designed to run efficiently, and my utility bills reflected that. Compared with a pair of aging window units and electric baseboards, I saw a meaningful drop in summer usage while gaining better humidity control and a quieter home. In heating mode, the 10 HSPF2 rating translates to solid shoulder‑season performance; resistance heat hasn’t kicked on nearly as often.

R32 refrigerant is a welcome move—lower global warming potential and slightly better thermodynamic efficiency than R410A. It doesn’t change your day‑to‑day experience, but it’s the right direction for new installs.

What could be better

No system is perfect, and a few areas could use refinement:

  • Install kit constraints: The included 16‑foot line sets and lightweight mounting plates are the biggest misses. Many homes will need longer runs, and better hardware would improve first impressions and fit. It’s not a performance issue, but plan for upgraded materials if your layout demands it.

  • Documentation depth: The manuals cover the basics well, but the wiring diagrams and multi‑head addressing could be clearer for unusual runs or replacing head units after the fact. It’s fine for a pro; DIYers will still have questions (and should hire a pro anyway).

  • App features: The app is stable and functional, but lightly featured. Energy estimates, geofencing, or per‑room history would make it stronger.

Who it’s for

  • Homeowners who need four independent zones without ductwork.
  • Mixed‑size rooms: three small bedrooms/offices and one larger living space line up perfectly with the 9k/9k/9k/18k split.
  • Those prioritizing efficiency, quiet operation, and basic smart control over deep analytics.
  • Climates where heat pump heating covers most of the year, with supplemental heat on the coldest days.

If you need very long line runs, have unusually high ceilings, or want granular energy reporting, budget for longer line sets, a more robust mounting hardware kit, and possibly a separate energy monitor.

The bottom line

The Costway quad‑zone mini split delivers strong multi‑room comfort, excellent cooling efficiency, and quiet operation at a competitive price point. The core hardware—the inverter compressor, indoor heads, and control logic—performs exactly as I’d hope. The compromises live mostly in the installer kit: short line sets and modest mounting hardware that may not suit every layout.

Recommendation: I recommend this system for homeowners who want efficient, quiet, four‑zone heating and cooling and are prepared to plan the install thoughtfully. Hire a licensed HVAC pro, budget for longer line sets and sturdier fasteners if your layout demands them, and you’ll end up with a capable, energy‑smart setup that keeps each room comfortable without fuss.



Project Ideas

Business

Shared Maker Space with Zoned Rentals

Open a membership‑based maker space that rents individual benches or bays with dedicated climate control per zone. Market to woodworkers, resin artists, restorers and leatherworkers who pay a premium for controlled curing/drying conditions. Use the unit's multi‑zone capabilities and smart scheduling to maximize hourly rental turnover.


Curing & Finishing Service

Offer a paid service to cure resin castings, cure epoxy countertops, accelerate paint and powder‑coat cures, and finish furniture. Multiple zones let you run different temperature profiles simultaneously for quick‑turn production. Remote Wi‑Fi control enables customers to drop off pieces and receive alerts when their job is ready.


Premium Short‑Term Rental for Remote Workers

Create an Airbnb/VRBO listing that highlights individualized comfort: separate climate zones for bedrooms, workspace and lounge, quiet night mode, and energy‑efficient operation. Target remote professionals who value precise climate control for comfort and equipment (e.g., photographers, musicians). Use smart scheduling to manage between bookings and reduce energy costs.


Pop‑Up Climate‑Controlled Retail or Event Booths

Outfit a shipping container or trailer with the multi‑zone mini‑split to run year‑round pop‑ups—flower stalls, specialty food demos, mobile showrooms—where different zones serve product display, prep, and staff areas. The chassis heating and -13°F capability let you operate in cold climates; the unit's efficiency keeps operating expenses manageable.


Niche Mini‑Split Installation & Maintenance Service for Makers

Start an HVAC niche business specializing in designing and installing multi‑zone mini‑splits for studios, greenhouses, aging rooms and maker spaces. Offer package deals: layout planning, professional installation, Wi‑Fi smart integration, and yearly maintenance. Position as the go‑to provider who understands craft‑specific climate needs (cure curves, humidity control, quiet operation).

Creative

Four‑Zone Craft Studio

Divide a garage or large room into four micro‑studios (woodworking, painting/finishing, resin, textiles). Use each mini‑split zone to keep the ideal temperature and humidity for that craft—warm and dry for finishes, cooler for wood stability, steady temps for resin curing. Use Wi‑Fi scheduling to preheat or cool specific bays before work sessions and low‑noise sleep mode for overnight projects.


Climate‑Controlled Resin & Composite Lab

Build a small bench lab optimized for epoxy, carbon fiber layups, and other composites. Stable temp/humidity reduces bubbles and variability; separate zones let you cure multiple batches at different temperatures simultaneously (e.g., 2 zones for slow cures, 1 for rapid post‑cure). The inverter efficiency and 23 SEER2 reduce running costs while the chassis heating keeps the outdoor unit reliable in cold months.


Microgreenhouse / Seedling Nursery

Convert a shed or bay into a zoned propagation setup: warm zone for germination, cooler zone for hardening off, a dry storage zone for tools, and a humid propagation zone. Precise control speeds up seed schedules and increases germination rates. The unit's -13°F operational capability and energy‑efficient inverter tech make year‑round production feasible even in cold climates.


Cheese‑Aging / Fermentation Room

Create a small artisanal food space for curing cheeses, fermenting kimchi/ferments, or drying sausages. Use separate zones to maintain different temperature/humidity profiles (aging vs. cold storage) and the dry mode to prevent unwanted mold. Smart controls allow tight schedules and remote monitoring of climate for food safety.


Quiet Maker Recording & Livestream Suite

Design a multi‑use studio where one zone is kept cool and quiet for audio/video recording (utilize the unit's low‑noise sleep mode), another zone for equipment racks (slightly cooler), and others for makeup/greenroom or editing. Wi‑Fi control lets you mute displays and adjust climate hands‑free during live sessions.