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

// Bottom Line

This Mitsubishi unit is ideal for homeowners retrofitting multi-room zoning without major ductwork overhauls. The 19.7 SEER2 rating and 10.3 HSPF make it cost-effective for regions with moderate heating demands, though the pre-charged 98-foot line set limits flexibility on larger installations.

Review

The Mitsubishi MSZ-GS24NA represents the efficient mid-range option for multi-zone residential heating and cooling. This wall-mounted five-zone system delivers 24,000 BTU cooling and 27,600 BTU heating capacity through individually controlled zones, making it popular for retrofits and additions where central ducting isn't feasible. The system balances performance specifications with practical installation constraints that most contractors encounter regularly.

Performance data shows a 19.7 SEER2 cooling efficiency rating and 10.3 HSPF for heating, translating to approximately 35-40% better cooling efficiency than baseline 13 SEER equipment. The 3.5-ton unit operates efficiently across a broad temperature range, cooling from 14 to 115 degrees and heating from 5 to 65 degrees outdoor temperature. Cooling capacity spans 361 to 701 CFM depending on zone demand, with noise levels ranging from 34 to 53 dBA, making it suitable for residential environments.

Pros & Cons

Pros

19.7 SEER2 efficiency rating significantly reduces cooling costs versus baseline 13 SEER equipment
10.3 HSPF heating efficiency maintains strong performance down to 5 degrees outdoor temperature
Five-zone capability (6+6+9+9+24 configuration) handles diverse room sizes without separate systems
Wireless controller included, eliminating additional purchase requirements
Single-phase 208/230V operation simplifies electrical requirements for standard residential service
10-year warranty with online registration covers manufacturing defects

Cons

Pre-charged for 98 feet limits installations requiring longer refrigerant runs without additional charging costs
Not Energy Star certified despite solid SEER2 performance, potentially affecting rebate eligibility
Operating noise reaches 53 dBA in cooling mode, noticeable in quiet environments
3.5-ton capacity may be undersized for large homes or high-load applications

Who Should Buy

Best For

Homeowners in mixed climates wanting to replace aging window units or add zoned comfort to existing homes without renovation. Contractors retrofitting properties where ductwork installation isn't practical and customers prioritize efficiency over lowest upfront cost.

Consider Alternatives If

Anyone needing heating performance below 5 degrees, living more than 98 feet from outdoor unit, or seeking the absolute cheapest entry into heat pump technology should explore alternatives.

42,000 BTU 19.7 SEER Mitsubishi Five Zone Heat Pum

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Installation

Single-phase 208/230V electrical service simplifies installation compared to three-phase units. Requires breaker sizing between 32.5 and 40 amps depending on local codes. The system arrives pre-charged for 98-foot refrigerant line sets, which accommodates most residential layouts. Contractors need to verify line length requirements before ordering to avoid additional charging fees. Wireless controller installation requires no specialized wiring.

Warranty & Reliability

Mitsubishi provides 10 years parts and labor coverage when registered online after purchase. This warranty covers compressor failure, component defects, and refrigerant leaks within the specified timeframe. Online registration is required to activate coverage, a straightforward process most dealers complete at commissioning. Warranty length ranks among industry leaders for heat pump systems.

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

Can this system handle heating in very cold climates? +

The unit operates down to 5 degrees outdoor temperature but efficiency diminishes below that point. At 5 degrees, heating output remains approximately 70% of rated capacity. For consistent cold-weather performance below freezing, supplemental heating or a higher-HSPF model is recommended.

What electrical upgrades are necessary for installation? +

Standard 208 or 230-volt single-phase service is required, which most homes already have. Install a 32.5 to 40-amp dedicated breaker depending on local codes. No three-phase conversion needed. Have a licensed electrician verify your panel capacity before installation begins.

How much will this reduce my cooling costs compared to my old AC unit? +

The 19.7 SEER2 rating versus typical 13 SEER equipment means approximately 35-40% cooling cost reduction. Actual savings depend on electricity rates, usage patterns, and climate zone. A typical homeowner in moderate climates might save $300-600 annually on cooling.

Is this system comparable to newer Daikin or Trane heat pumps at similar price points? +

Mitsubishi's 19.7 SEER2 and 10.3 HSPF ratings compete directly with equivalent Daikin and upper-tier Trane models. The five-zone flexibility is a strength. Trane units often cost more upfront. Daikin offers similar efficiency at comparable pricing with regional availability variations.

What happens if my refrigerant lines need to be longer than 98 feet? +

Professional technicians can add charge for extended line sets, though this adds labor costs and system complexity. Most residential installations fall within 98 feet. Verify distance before ordering to avoid complications during installation.

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