Can I really install this myself?

The refrigerant connection is the DIY part: the line sets are pre-charged and use QuickConnect fittings, so no vacuum pump or gauges are needed. You still need a 230V power circuit, mounting for two air handlers and, in most areas, a permit.

How many rooms can it handle?

Two zones, one 9,000 BTU and one 12,000 BTU air handler. Each zone has its own setpoint, so two rooms or one large room split into two areas work well.

Does it heat as well as it cools?

Yes. It is a heat pump rated at 23 SEER2, so it provides both cooling and heating. Heating output drops in extreme cold, as with any air-source heat pump.

What comes in the box?

The 27,000 BTU outdoor condenser, one 9,000 BTU and one 12,000 BTU wall air handler, and two 16 ft pre-charged QuickConnect line sets.

How does it compare with a single-zone mini split?

A single-zone unit is simpler and less expensive to install. This system costs more and needs two line runs, but it gives independent control of two rooms from one condenser.

What refrigerant does it use?

R-454B, a lower-global-warming refrigerant that is pre-charged in the factory line sets.

MRCOOL DIY 5th Gen 27K 2-Zone Mini Split System (9k + 12k)

Q: Where is the MRCOOL DIY 5th Gen 27K 2-Zone Mini Split System (9k + 12k) cheapest?

At MRCOOL DIRECT, for $3,775.00, as of our latest check.

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$3,775.00at MRCOOL DIRECTChecked Nov 9

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What reviewers say

Owners of the MRCOOL DIY line generally praise the QuickConnect setup as genuinely doable for a handy homeowner and report solid cooling and heating. Common complaints center on the electrical work, line-set length limits and occasional refrigerant charge issues that need a technician.

What people mention

InstallationPraisedOwners say the pre-charged QuickConnect lines let a careful DIYer finish the hookup without a vacuum pump.
Electrical workCriticisedBuyers note the system still needs a dedicated 230V circuit, which often means hiring an electrician.
Heating and coolingPraisedReviewers report strong output in both modes, including cold-weather heating.
Line set lengthMixedThe 16 ft lines suit many rooms but can fall short, and extending them is not straightforward.
Zone controlPraisedUsers like setting different temperatures for each of the two rooms.
ReliabilityMixedMost units run well, but some owners report charge or connection faults that need a technician.

About the MRCOOL DIY 5th Gen 27K 2-Zone Mini Split System (9k + 12k)

This is a 2-zone ductless mini split heat pump system that heats and cools. It pairs one outdoor condenser (model DIY-MULTI4-27HP230D-O) with a 9,000 BTU wall-mounted air handler and a 12,000 BTU wall-mounted air handler, for 27,000 BTU total. Each room gets its own temperature control. The condenser has 4 zones, and this bundle uses 2 of them, so compatible indoor units can be added later.

The system is built for homeowner installation without a vacuum pump, refrigerant gauges or special HVAC tools. It includes two 16 ft QuickConnect line sets that are factory pre-charged with R-454B refrigerant, so no vacuuming, charging or refrigerant handling is needed during installation.

A variable-speed DC inverter compressor drives the system, which has Dry Mode for dehumidifying, Sleep Mode, Eco functions and Auto Restart after power outages. Indoor operation is quiet. It can be controlled with the included wireless remotes, the SmartHVAC app on iPhone and Android, Amazon Alexa or Google Assistant.

Model

DIYM227HPW02D00

Series

MRCOOL DIY 5th Gen

Total capacity

27,000 BTU, 2 zones

Indoor units

1 x 9,000 BTU wall-mounted air handler, 1 x 12,000 BTU wall-mounted air handler

Outdoor unit

DIY-MULTI4-27HP230D-O multi-zone condenser, 4 zones (2 used)

Line sets

2 x 16 ft QuickConnect, factory pre-charged