SplitAtlas

Mitsubishi Electric / M-Series HX

Mitsubishi M-Series HX 24k R-454B 208/230V Mini-Split

Certified capacity
22,400 BTU/h[3]
SEER2
20 SEER2[3]
Heating floor
-5 F[1]
Voltage
208/230V[1]
Install path
Professional install

The M-Series HX 24k is the top of the value line at 2 tons: SEER2 20, EER2 11.75, HSPF2 9.5, with 26,000 BTU of heat at 47F and 18,200 BTU held at 5F. It is a lot of Mitsubishi capacity and cold-weather output at a value price - the practical pick for a large room that needs real heat.

1 zoneProfessional installCurrent

Refrigerant generation

R-454B - current-generation refrigerant

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Error Codes
Mitsubishi Electric M-Series HX 24,000 BTU R-454B 208/230V (MSZ-HX24NL / MUZ-HX24NL)

Image: Mitsubishi Electric

Data completeness: 92%
Last sourced
Jul 23, 2026

SplitAtlas score

7.8 / 10

Methodology
Cooling efficiencyBelow average

(20.0 SEER2) among 24k systems

Heating efficiencyBelow average

(9.5 HSPF2) among 24k systems

Cold-weather performanceBottom quartile

(5F certified capacity: 70% of the 47F rating; -5 F heating floor) among 24k systems

NoiseBelow average

(33 dBA indoor min / 55 dBA outdoor) among 24k systems

WarrantyTop quartile

(10 yr parts / 10 yr compressor) across the catalogue

Feature setBottom quartile

(1 verified feature) across the catalogue

Documentation & partsTop quartile

(9 manuals; spec sheet; parts channel) across the catalogue

Not evaluated

  • Installation accessibility — not applicable (professional install)N/A

    professional install - DIY-accessibility not applicable

  • Price-to-value — not evaluatedN/A

    This is a professionally installed, quote-only system, so we can't score its price. Get an installed quote to compare real cost.

    Get a quote

Key ratings

Rated cooling

22,400BTU/h[3]

Rated heating

26,000BTU/h[3]

Buyer review snapshot

Install difficulty

Professional install
  • Electrical: 208/230V; MCA 23 A; breaker/fuse 25 A.
  • Line set: connection type not sourced; precharged 50 ft; max 100 ft.

Alternatives

Availability and price context

This system needs a professional install, so its real price is an installed quote that depends on your home. We don't link to a listing for this exact model; get installation quotes to price it.

Source date

Model data sourced
Jul 23, 2026
Page reviewed
Jul 23, 2026
Source-backed records
4
Newest source retrieved
Jul 23, 2026

Warranty tiers

Base
5 yr parts / 7 yr compressor - licensed HVAC contractor installation
Registered
10 yr parts / 10 yr compressor - owner-occupied residence registered within 90 days of installation
Program
12 yr parts / 12 yr compressor - owner-occupied residence installed and registered by a Diamond Contractor within 90 days

The score uses Registered. Additional published terms are shown for reference and not counted in the score.

Review methodology

Model context

Structured ratings
Certification: ENERGY STAR certified and AHRI cold-climate designated. Refrigerant: current low-GWP R-454B. Minimum heating ambient: -5 F.

Strengths

  • 26,000 BTU at 47F and 18,200 BTU at 5F - strong heating for a value 2-ton unit.
  • SEER2 20 with current R-454B refrigerant.
  • Mitsubishi dealer support, documentation, and reliability reputation.

Weaknesses

  • EER2 11.75 / HSPF2 9.5 - efficiency is ordinary; the GX 24k is more efficient.
  • Professional dealer installation required; for a large space also price a zoned design.

Climate suitability

Minimum heating ambient
-5 F[1]
Certified heating at 5F
18,200 BTU/h[3]
Maximum heating at 5F (manufacturer)
18,200 BTU/h[2]
Rated heating at 17F
17,200 BTU/h[3]
Rated heating at 47F
26,000 BTU/h[3]

Specifications

Show
Manufacturer
Mitsubishi Electric
Brand
Mitsubishi Electric
Product line
M-Series HX
Model number
MSZ-HX24NL-U1 indoor / MUZ-HX24NL-U1 outdoor
Indoor unit model
MSZ-HX24NL-U1
Outdoor unit model
MUZ-HX24NL-U1
Number of zones
1
Max indoor units
not published
Rated cooling capacity
22,400 BTU/h[3]
Rated heating capacity
26,000 BTU/h[3]
Voltage
208/230V[1]
MCA
23 A[2]
Maximum fuse or breaker size
25 A[1]
Breaker needed
25 A[1]
SEER2
20 SEER2[3]
EER2
11.75 EER2[3]
HSPF2 (Region 4)
9.5 HSPF2[3]
HSPF2 (Region 5)
not published
COP
not published
COP at 47F
3.05 COP[2]
COP at 5F
1.8 COP[3]
Minimum outdoor heating temperature
-5 F[1]
Minimum outdoor cooling temperature
not published
Maximum outdoor temperature
115 F[1]
Indoor noise range
cooling 33 , 38 , 44 , 50; heating 34 , 39 , 44 , 50[2]
Outdoor noise rating
55 dBA[2]
Indoor weight
28 lb[2]
Outdoor weight
115 lb[2]
Refrigerant
R-454B[3]
Refrigerant charge
not published
Manufacturer coverage
not published
Line-set size
1/4 in liquid / 1/2 in suction
Included line-set length
Mitsubishi submittals publish line-size and maximum/precharged piping data; the installer supplies the line set.
Maximum line-set length
100 ft[2]
Max line set per indoor
not published
Maximum elevation difference
50 ft[2]
Max height between indoor units
not published
Wi-Fi support
not published
Energy Star status
ENERGY STAR certified[3]
AHRI certification number
215862743[3]
Warranty
Base: 5 yr parts / 7 yr compressor (licensed HVAC contractor installation); Registered: 10 yr parts / 10 yr compressor (owner-occupied residence registered within 90 days of installation); Program: 12 yr parts / 12 yr compressor (owner-occupied residence installed and registered by a Diamond Contractor within 90 days). Score uses Registered. Additional published terms are shown for reference and not counted in the score.. Standard residential M-Series warranty is 5 years parts and 7 years compressor from installation by a licensed HVAC contractor. Enhanced residential terms are 10 years parts and compressor for an owner-occupied residence registered within 90 days of installation, and 12 years parts and compressor when installed in an owner-occupied residence by a Diamond Contractor and registered by that Diamond Contractor within 90 days.
Install path
Professional install
Retail price
Installed quote only
Available retailers
not published
Manual links
AHRI certificate 215862743, AHRI public detail 215862743, ENERGY STAR exact row for AHRI 215862743, M-Series HX Mitsubishi Comfort product page, M-Series HX Mitsubishi Comfort product page, MitsubishiPro product record MUZ-HX24NL-U1, MSZ-HX24NL & MUZ-HX24NL Mitsubishi Electric submittal, METUS Residential M-Series, P-Series and SMART MULTI Limited Warranty Statement
Specification sheet
MSZ-HX24NL & MUZ-HX24NL Mitsubishi Electric submittal
Last sourced date
Jul 23, 2026

Parts and filters

Fits Mitsubishi Electric M-Series HX 24,000 BTU R-454B 208/230V (MSZ-HX24NL / MUZ-HX24NL). Part numbers and fit notes identify compatibility only; no manufacturer endorsement is implied.

filter-anti-allergy

Mitsubishi electro static anti-allergy enzyme filter

Fits
Mitsubishi Electric M-Series HX 24,000 BTU R-454B 208/230V (MSZ-HX24NL / MUZ-HX24NL)
OEM part number
MAC-2320FT-E
Filter care
Replace every year; vacuum every 3 months in between; if dirt remains, soak and rinse in lukewarm water, then shade-dry.
Fit note
Fits MSZ-HX24NL / MUZ-HX24NL. Manufacturer documentation publishes this OEM part number for this model family. No live HVACDirect exact-part offer was found; source through an authorized Mitsubishi Electric dealer with the model and serial number.
Source
Mitsubishi Electric MSZ-HX09NL / MUZ-HX09NL Submittal, INDOOR UNIT ACCESSORIES: MSZ-HX09NL, page p. 4 (Electro Static Anti-allergy Enzyme Filter MAC-2320FT-E)

filter-microparticle

Mitsubishi microparticle filter

Fits
Mitsubishi Electric M-Series HX 24,000 BTU R-454B 208/230V (MSZ-HX24NL / MUZ-HX24NL)
OEM part number
MAC-EMF515FT-E
Filter care
Replace every 3 years; vacuum only every 3 months in between; do not wash with water.
Fit note
Fits MSZ-HX24NL / MUZ-HX24NL. Manufacturer documentation publishes this OEM part number for this model family. No live HVACDirect exact-part offer was found; source through an authorized Mitsubishi Electric dealer with the model and serial number.
Source
Mitsubishi Electric MSZ-HX09NL / MUZ-HX09NL Submittal, INDOOR UNIT ACCESSORIES: MSZ-HX09NL, page p. 4 (Microparticle Filter MAC-EMF515FT-E)

smart-controller-module

Mitsubishi Wireless Interface 2

Fits
Mitsubishi Electric M-Series HX 24,000 BTU R-454B 208/230V (MSZ-HX24NL / MUZ-HX24NL)
OEM part number
PAC-USWHS002-WF-2
Fit note
Fits MSZ-HX24NL / MUZ-HX24NL. Manufacturer documentation publishes this OEM part number for this model family. HVACDirect was verified as a live exact-part page on 2026-08-01.
Source
Mitsubishi Electric MSZ-HX09NL / MUZ-HX09NL Submittal, INDOOR UNIT ACCESSORIES: MSZ-HX09NL, page p. 4 (Wireless Interface 2 for Comfrot app PAC-USWHS002-WF-2)

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Paid link

Check price at HVACDirect

control-interface

Mitsubishi M-Net I/O Control Interface for M-Series

Fits
Mitsubishi Electric M-Series HX 24,000 BTU R-454B 208/230V (MSZ-HX24NL / MUZ-HX24NL)
OEM part number
MAC-334IF-E
Fit note
Fits MSZ-HX24NL / MUZ-HX24NL. Manufacturer documentation publishes this OEM part number for this model family. HVACDirect was verified as a live exact-part page on 2026-08-01.
Source
Mitsubishi Electric MSZ-HX09NL / MUZ-HX09NL Submittal, INDOOR UNIT ACCESSORIES: MSZ-HX09NL, page p. 4 (M-Net I/O Control Interface for M-Series <sup>2</sup> MAC-334IF-E)

Some retailer links may earn us a commission at no extra cost; paid relationships never change scores or recommendations. Affiliate disclosure

Paid link

Check price at HVACDirect

thermostat-interface

Mitsubishi thermostat interface for third-party thermostats

Fits
Mitsubishi Electric M-Series HX 24,000 BTU R-454B 208/230V (MSZ-HX24NL / MUZ-HX24NL)
OEM part number
PAC-US445CN-1
Fit note
Fits MSZ-HX24NL / MUZ-HX24NL. Manufacturer documentation publishes this OEM part number for this model family. HVACDirect was verified as a live exact-part page on 2026-08-01.
Source
Mitsubishi Electric MSZ-HX09NL / MUZ-HX09NL Submittal, INDOOR UNIT ACCESSORIES: MSZ-HX09NL, page p. 4 (Thermostat Interface for 3rd Party Thermostats PAC-US445CN-1)

Some retailer links may earn us a commission at no extra cost; paid relationships never change scores or recommendations. Affiliate disclosure

Paid link

Check price at HVACDirect

wireless-remote-controller

Mitsubishi RedLINK wireless remote controller

Fits
Mitsubishi Electric M-Series HX 24,000 BTU R-454B 208/230V (MSZ-HX24NL / MUZ-HX24NL)
OEM part number
MHK2
Fit note
Fits MSZ-HX24NL / MUZ-HX24NL. Manufacturer documentation publishes this OEM part number for this model family. HVACDirect was verified as a live exact-part page on 2026-08-01.
Source
Mitsubishi Electric MSZ-HX09NL / MUZ-HX09NL Submittal, INDOOR UNIT ACCESSORIES: MSZ-HX09NL, page p. 4 (Wireless RedLINK™ Remote Controller MHK2)

Some retailer links may earn us a commission at no extra cost; paid relationships never change scores or recommendations. Affiliate disclosure

Paid link

Check price at HVACDirect
Find this model's filterReplacement Parts & Filters

Electrical requirements

Show
Voltage
not published
Voltage range
208/230V[1]
Phase
1[1]
Frequency
60 Hz[1]
MCA
23 A[2]
Breaker needed
25 A[1]
Maximum breaker size
not published
Maximum fuse size
25 A[1]
Maximum cooling current
not published
Maximum heating current
not published
Manufacturer wire notes
14 AWG indoor-outdoor[2]

Installation considerations

Show
Liquid line
1/4 in[2]
Suction line
1/2 in[2]
Line connection type
not published
Precharged length
50 ft[2]
Included line-set length
Mitsubishi submittals publish line-size and maximum/precharged piping data; the installer supplies the line set.
Maximum line-set length
100 ft[2]
Max line set per indoor
not published
Max height between indoor units
not published
Indoor dimensions
36-5/16 x 10-7/8 x 12 in[2]
Outdoor dimensions
33-1/16 x 13 x 34-5/8 in[2]
Indoor weight
28 lb[2]
Outdoor weight
115 lb[2]
Drain size
5/8 in[2]

Related systems and guides

Frequently asked questions

Can I install the Mitsubishi Electric M-Series HX 24,000 BTU R-454B 208/230V (MSZ-HX24NL / MUZ-HX24NL) myself, or do I need a pro?
Mitsubishi Electric M-Series HX 24,000 BTU R-454B 208/230V (MSZ-HX24NL / MUZ-HX24NL) is built for professional installation: the line set must be flared, evacuated, and charged, which requires EPA-certified refrigerant handling. Installing it outside the manufacturer's requirements can void the warranty, so budget for a qualified HVAC installer.
Will the Mitsubishi Electric M-Series HX 24,000 BTU R-454B 208/230V (MSZ-HX24NL / MUZ-HX24NL) keep heating in a cold winter?
The AHRI/ENERGY STAR certification lists 18,200 BTU/h of heating capacity at 5F. Rated heating operation extends down to -5 F. Certified heating efficiency is 9.5 HSPF2. Match those numbers against your climate's design temperature - in cold regions, output at 5F matters far more than the nameplate capacity measured at 47F.
What electrical circuit does the Mitsubishi Electric M-Series HX 24,000 BTU R-454B 208/230V (MSZ-HX24NL / MUZ-HX24NL) need?
Published electrical requirements: 208/230V voltage, 23 A minimum circuit ampacity, and 25 A maximum breaker or fuse sizing. Confirm the final circuit against the unit nameplate and local code with a licensed electrician.
How far can the outdoor unit be from the indoor head?
The published maximum line-set length is 100 ft. The outdoor unit's factory charge covers up to 50 ft of line; longer runs need added refrigerant. Measure the planned routing before ordering.
What warranty does the Mitsubishi Electric M-Series HX 24,000 BTU R-454B 208/230V (MSZ-HX24NL / MUZ-HX24NL) carry?
The manufacturer publishes these warranty tiers: Base: 5 yr parts / 7 yr compressor (licensed HVAC contractor installation); Registered: 10 yr parts / 10 yr compressor (owner-occupied residence registered within 90 days of installation); Program: 12 yr parts / 12 yr compressor (owner-occupied residence installed and registered by a Diamond Contractor within 90 days). Score uses Registered. Additional published terms are shown for reference and not counted in the score.. Registration requirements and proof of qualified installation commonly affect coverage, so read the warranty terms before install day.

Data sources

Show
  1. Mitsubishi Electric Trane HVAC US LLC: MitsubishiPro product record MUZ-HX24NL-U1Sourced - manufacturer product page

    Covers Breaker needed, Frequency, Maximum fuse size, Phase, Voltage range, Minimum outdoor heating temperature and more

  2. Mitsubishi Electric Trane HVAC US LLC: MSZ-HX24NL & MUZ-HX24NL Mitsubishi Electric M-Series HX submittalSourced - manufacturer technical document

    Covers electrical_spec.guaranteed_voltage_range, electrical_spec.indoor_mca_amps, Minimum circuit ampacity, Manufacturer wire notes, Drain size, Indoor dimensions and more

  3. Air-Conditioning, Heating, and Refrigeration Institute: AHRI public detail 215862743 for MSZ-HX24NL / MUZ-HX24NLSourced - AHRI directory

    Covers AHRI certification number, performance_spec.cold_climate_designation, Rated cooling capacity, COP at 5F, EER2, Energy Star status and more

  4. Mitsubishi Electric Trane HVAC US LLC: METUS Residential M-Series, P-Series and SMART MULTI Limited Warranty StatementSourced - secondary source

    Covers Additional published compressor warranty, Additional published warranty conditions, Additional published parts warranty, Legacy compressor warranty value, Legacy warranty value, Registered compressor warranty and more

Last updated

Jul 23, 2026