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

// Bottom Line

This Mitsubishi unit excels for contractors and homeowners needing multi-zone flexibility without sacrificing efficiency. The 19.7 SEER2 rating and 10.3 HSPF make it ideal for moderate climates where heating demand is moderate and cooling is frequent.

Review

The Mitsubishi MSZ-GS24NA represents a solid entry point into high-efficiency multi-zone heat pump systems. This five-zone wall-mounted unit combines compact dimensions (43.3 inches wide, 12.8 inches tall) with legitimate heating and cooling capacity, making it popular among contractors upgrading older systems. At 42,000 BTU total system capacity, it targets moderate-sized homes and selective zoning applications rather than whole-home replacement scenarios.

Performance numbers tell an encouraging story. The unit delivers 19.7 SEER2 cooling efficiency with an EER of 9.2, while the 10.3 HSPF heating rating keeps operating costs reasonable through shoulder seasons. Cooling output reaches 22,400 BTU with heating capacity at 27,600 BTU, sufficient for most individual zones in a properly designed system. Decibel levels range from 32 to 53 dB across heating and cooling modes, keeping noise within acceptable residential limits.

Pros & Cons

Pros

19.7 SEER2 efficiency rating delivers excellent cooling performance and lower operating costs
10.3 HSPF heating efficiency maintains comfort down to 5 degrees outdoor temperature
Five-zone configuration (6+6+6+6+24) allows independent temperature control across multiple rooms
Wireless controller included, eliminating additional control system expenses
Pre-charged for 98 feet of lineset reduces installation complexity and field charging labor
Single-phase 208/230V electrical compatibility works in most residential and light commercial settings

Cons

42,000 BTU total capacity may be undersized for larger homes or extremely hot climates
Not Energy Star certified despite high SEER2 rating, limiting some rebate eligibility
Operating temperature range of 5 to 65 degrees for heating limits performance in extreme cold climates
No heating capability below 5 degrees outdoor temperature requires backup electric resistance

Who Should Buy

Best For

This unit fits homeowners and contractors working on multi-zone retrofits in moderate climates where space constraints favor wall-mounted designs. It's particularly suited for homes with separate cooling and heating zones that need individual temperature management without large outdoor equipment footprints.

Consider Alternatives If

Buyers in cold-climate regions requiring consistent heating below 5 degrees or homes needing capacity exceeding 42,000 BTU total should consider larger or cold-climate specialized systems instead.

42,000 BTU 19.7 SEER Mitsubishi Five Zone Heat Pum

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Installation

Installation requires single-phase 208/230V electrical service with breaker sizing between 32.5 and 40 amps. The pre-charged 98-foot lineset capability significantly reduces field work and potential refrigerant loss during commissioning. Liquid line measures 1/4 inch, suction line 5/8 inch, and condensate drain 5/8 inch. Mitsubishi provides comprehensive documentation, though professional installation is strongly recommended for proper evacuation and performance verification.

Warranty & Reliability

Mitsubishi backs this unit with a standard 10-year compressor and parts warranty upon online registration. This coverage period ranks competitively within the industry and covers internal component failures during normal operation. Registration is straightforward and should be completed immediately after installation to activate full protection.

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

Is this unit suitable for a whole-home replacement in a 2,500 square foot house? +

Probably not as your only unit. At 42,000 BTU total capacity, it works better for targeted zoning, additions, or supplementary cooling. A typical 2,500 square foot home needs 60,000 to 90,000 BTU depending on climate. Consider this for partial coverage or paired with additional units.

How difficult is installation if I have existing lineset runs? +

Moderately straightforward if runs are available. The pre-charged 98-foot design means you may skip field charging if distances work. You'll still need proper evacuation, electrical work, and condensate routing. Most contractors charge 8 to 12 hours labor for complete installation.

Will the 10.3 HSPF rating keep my home warm in Minnesota winters? +

Only down to 5 degrees outdoor temperature. Below that, you'll need backup heat. In Minnesota, outdoor temperatures regularly dip below 5 degrees, making this unit problematic as a sole heat source. A cold-climate heat pump rated for lower temperatures is better suited.

How does the 19.7 SEER2 compare to other high-efficiency ductless units? +

It's competitive but not exceptional. Premium Mitsubishi models and Fujitsu units reach 20+ SEER2. However, the gap in real-world cooling bills between 19.7 and 21 SEER2 is roughly 5 to 7 percent, often less than the price premium.

What happens if my home needs more than one zone at maximum capacity? +

The 6+6+6+6+24 configuration means the primary zone can run at 24,000 BTU while other zones split remaining capacity. This design prioritizes one area, limiting simultaneous full-capacity operation across all five zones.

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