Can I really install this myself?

Yes, if you can run the line sets and handle the electrical connection. The pre-charged quick-connect lines need no vacuum pump or brazing. Ceiling cassette installs still mean cutting ceiling openings and routing lines, so some buyers hire help for that part.

Do the ceiling cassettes need attic access?

They need space above the ceiling for the unit body and drain line. A drop ceiling, attic or open joist bay works. Rooms with no access above the ceiling are a poor fit.

How many zones can the condenser run?

Up to three. This configuration pairs it with two 6K and one 9K cassette. The condenser is sized for all three, so running one zone alone is less efficient than running all of them.

Does it work with Alexa and Google Assistant?

Yes, through the SmartHVAC app and the WiFi module. Each zone can be set by voice or phone. If a dongle fails to pair, that zone loses app and voice control until it is replaced.

Is it a heat pump or cooling only?

It is a heat pump and provides both heating and cooling. That makes it a year-round replacement for window units and baseboard heaters in mild to moderate climates.

What comes in the box?

The 18K condenser, three ceiling cassettes, three remotes and the installation accessories. Line sets and wiring are separate, so check the lengths you need before ordering.

What do buyers say about the MRCOOL DIY 5th Gen 3-Zone 18K 24 SEER2 Mini Split 6K+6K+9K?

Rated 4.9 out of 5 from 154 ratings. Buyers like: Easy, quick DIY installation with everything needed provided; Ceiling cassettes are unobtrusive; Works incredibly well. Common complaints: WiFi dongle for one unit would not work.

Where can I buy the MRCOOL DIY 5th Gen 3-Zone 18K 24 SEER2 Mini Split 6K+6K+9K?

2 stores we checked sell it, including eBay, Chill Mini Splits.

MRCOOL DIY 5th Gen 3-Zone Mini Split Price History: Lowest $3,895.00

Q: Where is the MRCOOL DIY 5th Gen 3-Zone 18K 24 SEER2 Mini Split 6K+6K+9K cheapest?

At eBay, for $3,895.00, as of our latest check.

What reviewers say

4.9 / 5154 ratings

Owners rate it highly and most call the install easier than expected. They like the flush ceiling cassettes and say the system heats and cools well. The main complaint is a WiFi dongle that would not connect.

What people mention

InstallationPraisedOwners say the quick-connect lines make setup fast and that everything needed comes in the box.
Ceiling cassettesPraisedBuyers like that the cassettes sit flush and leave wall space free.
PerformancePraisedOwners report the system heats and cools effectively across zones.
WiFiCriticisedOne owner's WiFi dongle would not connect, blocking app control for that unit.
Build qualityPraisedBuyers describe the hardware as solid and well made.

From Chill Mini Splits

18,000 BTU condenser supports up to 3 zones
Pairs with 6K–12K BTU ceiling cassette air handlers
True DIY installation with quick-connect lines
Ultra-slim ceiling cassette design for flush mounting
Individual zone control via smartphone or voice
Whisper-quiet operation and automatic swing functionality

Guarantee: 7-year compressor warranty, 5-year parts warranty, and Limited Lifetime Replacement warranty with enrollment in the MRCOOL Care Program.
Shipping: Free delivery; pre-order estimated shipping 2–4 weeks.
In the box: (1) 18K BTU 5th Gen Multi-Zone DIY Condenser, (3) Ceiling Cassette Air Handlers (size varies by configuration), (3) Remotes, Full installation accessories, DIY OuttaSight Brochure, Multizone Brochure

About the MRCOOL DIY 5th Gen 3-Zone 18K 24 SEER2 Mini Split 6K+6K+9K

The MRCOOL DIY 5th Gen 3-Zone is a ductless mini-split system with an 18,000 BTU condenser and three ceiling cassette air handlers. The condenser supports up to three zones and pairs with 6K to 12K BTU ceiling cassettes in any combination. The system heats and cools.

The ceiling cassettes have a low-profile, ultra-slim design for flush mounting in the ceiling, which leaves wall space free. The system uses MRCOOL's DIY installation technology with quick-connect lines, so homeowners can set it up without special tools, training or professional labor.

Each zone runs independently. Control is by remote, by the MRCOOL SmartHVAC app on a smartphone, or by voice with Amazon Alexa and Google Assistant. Operation is quiet, and the cassettes have an automatic swing function.

Capacity: 18,000 BTU condenser
Zones: 3, each controlled independently
Installation: DIY with quick-connect lines
Controls: Remote, MRCOOL SmartHVAC app, Alexa, Google Assistant
Functions: Heating and cooling
In the box: 18K BTU 5th Gen Multi-Zone DIY condenser, 3 ceiling cassette air handlers, 3 remotes, installation accessories, DIY OuttaSight brochure, Multizone brochure