Mitsubishi Electric / M-Series GX Hyper-Heat
Mitsubishi Electric M-Series GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ)
Model data is drawn from manufacturer, retailer, and certification sources. Missing specifications remain marked as not published.
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Data completeness: 90%
- Last verified
- Jul 23, 2026
SplitAtlas score
7.8 / 10
Cooling efficiency22.7
Heating efficiency49.8
Cold-weather performance100.0
Noise8.7
Warranty5.0
Feature set0.0
Documentation & parts50.0
Not evaluated
- Installation accessibility — not applicable (professional install)N/A
professional install - DIY-accessibility not applicable
- Price-to-value — not evaluatedN/A
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Mitsubishi Electric M-Series GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ) review summary
The GX 24k Hyper-Heat is the largest cold-climate single-zone in the mainstream line: 2 tons, SEER2 21.5, EER2 13, holding 21,200 BTU of heat from 47F down to 5F. For a big open space in a genuinely cold region, it is the GX to choose over the standard 24k.
Rated cooling
22,400BTU/hVerified - AHRI directory
Rated heating
21,200BTU/hVerified - AHRI directory
Mitsubishi Electric M-Series GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ) best-fit use cases
A large living/dining area or finished basement in a cold climate that needs 2 tons of dependable low-temperature heat from one head.
Mitsubishi Electric M-Series GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ) specifications
- Manufacturer
- Mitsubishi Electric
- Brand
- Mitsubishi Electric
- Product line
- M-Series GX Hyper-Heat
- Model number
- MSZ-GX24NL-U1 indoor / MUZ-GX24NLHZ-U1 outdoor
- Indoor unit model
- MSZ-GX24NL-U1
- Outdoor unit model
- MUZ-GX24NLHZ-U1
- Number of zones
- 1
- Max indoor units
- not published
- Rated cooling capacity
- 22,400 BTU/hVerified - AHRI directory
- Rated heating capacity
- 21,200 BTU/hVerified - AHRI directory
- Voltage
- 208/230VVerified - manufacturer product page
- MCA
- 23 AVerified - manufacturer technical document
- Maximum fuse or breaker size
- 25 AVerified - manufacturer technical document
- Breaker needed
- 25 AVerified - manufacturer product page
- SEER2
- 21.5 SEER2Verified - AHRI directory
- EER2
- 13 EER2Verified - AHRI directory
- HSPF2 (Region 4)
- 10 HSPF2Verified - AHRI directory
- HSPF2 (Region 5)
- not published
- COP
- not published
- COP at 47F
- 4.14 COPVerified - manufacturer technical document
- COP at 5F
- 1.8 COPVerified - AHRI directory
- Minimum outdoor heating temperature
- -22 FVerified - manufacturer product page
- Minimum outdoor cooling temperature
- not published
- Maximum outdoor temperature
- not published
- Indoor noise range
- cooling 30 , 37 , 41 , 48 , 53; heating 30 , 37 , 41 , 45 , 50Verified - manufacturer technical documentmanufacturer published: cooling 30; heating 55 dB(A)
- Outdoor noise rating
- 55 dBAVerified - manufacturer technical document
- Indoor weight
- 37 lbVerified - manufacturer technical documentmanufacturer published: 36.38 lb
- Outdoor weight
- 117 lbVerified - manufacturer technical documentmanufacturer published: 116.4 lb
- Refrigerant
- R-454BVerified - AHRI directory
- Refrigerant charge
- not published
- Manufacturer coverage
- not published
- Line-set size
- 1/4 in liquid / 5/8 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 ftVerified - manufacturer technical document
- Max line set per indoor
- not published
- Maximum elevation difference
- 50 ftVerified - manufacturer technical document
- Max height between indoor units
- not published
- Wi-Fi support
- not published
- Energy Star status
- certifiedVerified - AHRI directory
- AHRI certification number
- 215862741Verified - AHRI directory
- Warranty
- 5 years parts / 7 years compressor. 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.
- DIY installation status
- Professional install
- Retail price
- HVACDirect exact model search returned 403 and no exact product page with visible price was retrieved on 2026-07-23.
- Installation type
- Professional install
- Available retailers
- not published
- Manual links
- AHRI certificate 215862741, AHRI public detail 215862741, ENERGY STAR exact row for AHRI 215862741, M-Series GX Hyper-Heat Mitsubishi Comfort product page, M-Series GX Hyper-Heat Mitsubishi Comfort product page, MitsubishiPro product record MUZ-GX24NLHZ-U1, HVACDirect exact search for MSZ-GX24NL / MUZ-GX24NLHZ, MSZ-GX24NL & MUZ-GX24NLHZ Mitsubishi Electric submittal, METUS Residential M-Series, P-Series and SMART MULTI Limited Warranty Statement
- Specification sheet
- MSZ-GX24NL & MUZ-GX24NLHZ Mitsubishi Electric submittal
- Last verified date
- Jul 23, 2026
Mitsubishi Electric M-Series GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ) strengths
- Holds 21,200 BTU of heat down to 5F - strong deep-cold output at 2 tons.
- SEER2 21.5 / EER2 13 with current R-454B refrigerant.
- Mitsubishi dealer support, documentation, and reliability reputation.
Mitsubishi Electric M-Series GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ) weaknesses
- HSPF2 10; at 2 tons the per-BTU efficiency trails the smaller GX units.
- Premium price; professional dealer installation required, and a zoned design often suits a space this large better.
Mitsubishi Electric M-Series GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ) climate suitability
- Minimum heating ambient
- -22 FVerified - manufacturer product page
- Rated heating at 5F
- 21,200 BTU/hVerified - AHRI directory
- Rated heating at 17F
- 14,000 BTU/hVerified - AHRI directory
- Rated heating at 47F
- 21,200 BTU/hVerified - AHRI directory
Mitsubishi Electric M-Series GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ) electrical requirements
- Voltage
- not published
- Voltage range
- 208/230VVerified - manufacturer product page
- Phase
- 1Verified - manufacturer product page
- Frequency
- 60 HzVerified - manufacturer product page
- MCA
- 23 AVerified - manufacturer technical document
- Breaker needed
- 25 AVerified - manufacturer product page
- Maximum breaker size
- not published
- Maximum fuse size
- 25 AVerified - manufacturer technical document
- Maximum cooling current
- not published
- Maximum heating current
- not published
- Manufacturer wire notes
- 14 AWG indoor-outdoorVerified - manufacturer technical document
Mitsubishi Electric M-Series GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ) installation considerations
- Liquid line
- 1/4 inVerified - manufacturer technical document
- Suction line
- 5/8 inVerified - manufacturer technical document
- Precharged length
- 50 ftVerified - manufacturer technical document
- 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 ftVerified - manufacturer technical document
- Max line set per indoor
- not published
- Max height between indoor units
- not published
- Indoor dimensions
- 43-5/16 x 10-1/8 x 12-13/16 inVerified - manufacturer technical documentmanufacturer published: 43.307 x 10.118 x 12.795 in
- Outdoor dimensions
- 33-1/16 x 13 x 34-5/8 inVerified - manufacturer technical documentmanufacturer published: 33.071 x 12.992 x 34.646 in
- Indoor weight
- 37 lbVerified - manufacturer technical documentmanufacturer published: 36.38 lb
- Outdoor weight
- 117 lbVerified - manufacturer technical documentmanufacturer published: 116.4 lb
- Drain size
- 5/8 inVerified - manufacturer technical document
Mitsubishi Electric M-Series GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ) related systems and guides
- More Mitsubishi Electric systems
- Mitsubishi Electric M-Series GS 24,000 BTU R-410A 208/230V (MSZ-GS24NA / MUZ-GS24NA)
- Mitsubishi Electric M-Series GS Hyper-Heat 24,000 BTU R-410A 208/230V (MSZ-GS24NA / MUZ-GS24NAHZ)
- Mitsubishi Electric M-Series GX 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NL)
- Mitsubishi Electric M-Series HM 24,000 BTU R-410A 208/230V (MSZ-HM24NA / MUZ-HM24NA)
- Buying guide
- Single vs multi-zone
- Cold-weather performance
Frequently asked questions
- Can I install the Mitsubishi Electric M-Series GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ) myself, or do I need a pro?
- Mitsubishi Electric M-Series GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ) 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 GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ) keep heating in a cold winter?
- The manufacturer publishes 21,200 BTU/h of heating output at 5F. Rated heating operation extends down to -22 F. Certified heating efficiency is 10 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 GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ) 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, and the included line set comes pre-charged for 50 ft. Longer runs than the included set allows typically mean added refrigerant and a pro visit, so measure the planned routing before ordering.
- What warranty does the Mitsubishi Electric M-Series GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ) carry?
- The manufacturer publishes 5 years parts coverage and 7 years compressor coverage. Registration requirements and proof of qualified installation commonly affect coverage, so read the warranty terms before install day.
Mitsubishi Electric M-Series GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ) data sources
- Mitsubishi Electric Trane HVAC US LLC: MitsubishiPro product record MUZ-GX24NLHZ-U1Verified - manufacturer product page
Covers Breaker needed, Frequency, Phase, Voltage range, Minimum outdoor heating temperature, system.lifecycle_status
- Mitsubishi Electric Trane HVAC US LLC: MSZ-GX24NL & MUZ-GX24NLHZ Mitsubishi Electric M-Series GX submittalVerified - manufacturer technical document
Covers electrical_spec.guaranteed_voltage_range, electrical_spec.indoor_mca_amps, Maximum fuse size, Minimum circuit ampacity, Manufacturer wire notes, Drain size and more
- Air-Conditioning, Heating, and Refrigeration Institute: AHRI public detail 215862741 for MSZ-GX24NL / MUZ-GX24NLHZVerified - AHRI directory
Covers AHRI certification number, Rated cooling capacity, COP at 5F, EER2, Energy Star status, Rated heating capacity and more
- Mitsubishi Electric Trane HVAC US LLC: Residential M-Series, P-Series and SMART MULTI Split Air Conditioner and Heat Pump Systems Limited Warranty StatementVerified - manufacturer technical document
Covers Compressor warranty, Parts warranty, Warranty notes
Mitsubishi Electric M-Series GX Hyper-Heat 24,000 BTU R-454B 208/230V (MSZ-GX24NL / MUZ-GX24NLHZ) last updated
Jul 23, 2026