42,000 BTU 19.7 SEER Mitsubishi Five Zone Heat Pump System 6+6+6+9+24 Review 2026

// Bottom Line

This Mitsubishi five-zone system is ideal for homeowners with larger properties needing simultaneous climate control across multiple rooms. The 19.7 SEER2 rating and 10.3 HSPF make it a solid choice for mixed climates, though installation costs and single-phase electrical requirements should factor into your decision.

Review

The Mitsubishi MSZ-GS24NA is a wall-mounted, five-zone mini-split heat pump system engineered for homes and light commercial applications requiring independent climate zones. At 3.5 tons cooling capacity (24,000 BTU per 2-ton equivalent), it positions itself in the premium efficiency segment with a focus on homes that need simultaneous heating and cooling across multiple spaces. This configuration proves especially practical for split-level homes, renovations, or open-concept properties where traditional central HVAC zoning struggles.

Performance metrics are genuinely strong here. The system delivers 22,400 BTU cooling and 27,600 BTU heating output, with a 19.7 SEER2 rating that reflects current seasonal efficiency testing. Its 10.3 HSPF heating performance handles outdoor temperatures as low as 5 degrees, making it viable for northern climates. The 9.2 EER rating indicates solid part-load cooling efficiency. Noise levels of 34-53 dBA during cooling and 32-52 dBA during heating stay quiet enough for bedroom installations.

Pros & Cons

Pros

19.7 SEER2 efficiency rating, well above minimum federal standards for cooling performance
27,600 BTU heating output with 10.3 HSPF covers cold climates down to 5 degrees outdoor temperature
Five-zone configuration (6+6+6+9+24 thousand BTU) allows independent temperature control across different areas without zoning dampers
Wireless controller included, eliminating additional control costs at installation
Low sound levels at 34-53 dBA cooling and 32-52 dBA heating make it suitable for bedrooms and living spaces

Cons

Pre-charged for only 98 feet of line set, requiring custom refrigerant calculations for longer runs
Single-phase 208/230v requirement may necessitate electrical work on older homes with three-phase service
Not Energy Star certified despite strong SEER2 rating, missing potential utility rebates available in some regions
Five separate indoor units require wall space and aesthetic consideration in each zone

Who Should Buy

Best For

Contractors installing systems in homes with 3.5-ton cooling requirements across multiple zones, and homeowners with established electrical service who want zone-specific temperature control without traditional ductwork. This is particularly valuable in renovations, open floor plans, or homes where different rooms have dramatically different temperature needs.

Consider Alternatives If

Homeowners limited to three-phase power supply, those seeking Energy Star certification for maximum rebates, or anyone with line set runs exceeding 98 feet without budget for additional refrigerant and extended line set management.

42,000 BTU 19.7 SEER Mitsubishi Five Zone Heat Pum

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Installation

Installation involves mounting five separate indoor units on walls and connecting them to a single outdoor condenser via refrigerant and electrical lines. The system arrives pre-charged for 98 feet of line set, a critical specification for installers. Electrical requirements are 208/230 volts, single-phase, 60 Hz with a 32.5 to 40-amp breaker. Drain line uses 5/8 inch tubing. Technicians should verify line set length before installation begins.

Warranty & Reliability

Mitsubishi offers a 10-year warranty when you register the system online after installation. This coverage protects against manufacturing defects across compressor, components, and parts. Registration is straightforward but mandatory to activate the full term, so don't skip this step. Coverage details should be confirmed in the installation manual regarding labor costs and regional service availability.

Specifications

SKU	MSZ-GS24NA
Brand/Manufacturer	Mitsubishi
Cooling BTU	22,400 BTU
Heating BTU	27,600 BTU
Refrigerant	R410A
Electrical	208/230v 1 Phase 60 Hz
BTU/Tonnage	24,000 BTU/2 Ton
Mini Split Type	Wall Mounted
Zone Compatibility	Multi Zone
Warranty	10 Years with Online Registration
Decibel Level (dBA)	C: 34-53 & H: 32-52
Weight (in lbs)	37.000000
Feature	Spec
Refrigerant Charge	Pre-Charged For: 98'
AHRI Certificate Number	209836185, 209836201, 209949003
Additional Information	Drain: 5/8"
Energy Star	No
HSPF	10.3
SEER2 (Efficiency)	19.7
EER	9.2
Liquid Line	1/4"
Suction Line	5/8"
Phase	Single Phase
Max Breaker Size	40
Min. Breaker Size	32.5
Tonnage	3.5 Ton
Min/Max Outdoor Temp for Heating	5°-65°
Min/Max Outdoor Temp for Cooling	14°-115°
Operating Mode	Cooling, Heating
Height	12-13/16"
Width	43-5/16"
Depth	9-3/8"
Resources	Submittal Service Manual Parts Manual Operation Manual Installation Manual Engineering Data You will need AdobeÂ® AcrobatÂ® Reader to view PDF documents.
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Controller	Wireless Included
Maximum CFM	C: 361-701 & H: 336-701
Capacity	Dehumidification Rate: 0.77 gal/hr

Frequently Asked Questions

What does the five-zone configuration actually mean for my home? +

You get five independently controlled indoor units (6,000, 6,000, 6,000, 9,000, and 24,000 BTU respectively) that draw from one outdoor compressor. Each zone operates at its own temperature setting using the wireless controller, eliminating the need for dampers, zoning panels, or complex ductwork modifications.

Will this system work with my existing electrical panel at 200 amps? +

Yes. The system requires 208/230 volts, single-phase service with a 32.5 to 40-amp breaker. Most residential panels can accommodate this. However, confirm your home's current electrical service capacity with a licensed electrician before purchasing.

How does 19.7 SEER2 compare to other modern systems? +

This rating exceeds the federal minimum of 13 SEER2 by 51 percent, placing it in the high-efficiency category. It won't match top-tier units exceeding 22 SEER2, but delivers better performance than many mid-range systems while maintaining reasonable costs.

Is this system suitable for climates with hard winters? +

Partially. The 10.3 HSPF and 5-degree minimum outdoor temperature rating work for moderate winters and shoulder seasons. In extremely cold climates (below negative 10 degrees), you may need supplemental heating or a backup furnace for consistent performance.

What happens if I register my system after the warranty period? +

Online registration is the only way to activate the 10-year warranty. If you skip registration, coverage defaults to a much shorter period. Register immediately after installation to ensure full protection.

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