How far can the outdoor unit be from the indoor head?

The published maximum line-set length is 65 ft. The outdoor unit's factory charge covers up to 25 ft of line; longer runs need added refrigerant. Measure the planned routing before ordering.

Mitsubishi Electric / M-Series GS

Mitsubishi M-Series GS 12k HZ 230V Mini-Split

Certified capacity: 12,000 BTU/h[1]
SEER2: 21.7 SEER2[2]
Heating floor: -13 F[1]
Voltage: 208/230V[1]
Install path: Professional install

The Hyper-Heat GS 12k is built for cold: rated heating operation to -13F versus the standard GS 12k's -4F. It certifies at SEER2 21.7 / HSPF2 9.6 with 12,300 BTU of heat at 47F - lower seasonal numbers than the standard version, which is the expected trade for extending usable heating into deep cold.

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Error Codes

Mitsubishi Electric M-Series GS 12k Hyper-Heating mini-split outdoor condenser

Image: HVACDirect

Data completeness: 100%

Last sourced: Jul 20, 2026

SplitAtlas score

8.5 / 10

Methodology

Cooling efficiencyAbove average

(21.7 SEER2) among 12k systems

Heating efficiencyTop quartile

(9.6 HSPF2) among 12k systems

Cold-weather performanceBelow average

(17F rated capacity: 61.8% of the 47F rating; -13 F heating floor) among 12k systems

NoiseTop quartile

(19 dBA indoor min / 51 dBA outdoor) among 12k systems

WarrantyTop quartile

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

Feature setBottom quartile

(1 verified feature) across the catalogue

Documentation & partsTop quartile

(6 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.
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Key ratings

Rated cooling

12,000BTU/h[1]

Rated heating

12,300BTU/h[1]

Best-fit use cases

A large bedroom or living room in a cold climate where the buyer needs dependable heating below 0F and wants Mitsubishi's Hyper-Heat system at 1 ton.

Buyer review snapshot

Install difficulty

Professional install

Electrical: 208/230V; MCA 10 A; breaker/fuse 15 A.
Line set: connection type not sourced; precharged 25 ft; max 65 ft.

Alternatives

Blueridge XS6 Max Efficiency 12,000 BTU R-454B 208/230V (BXS6A12WM0 / BXS6A12UC0)
9.0 score / 12k / SEER2 29.4 / -22 F heating floor / 230V
Exact destination at Alpine Home Air: $1,979.00, checked Jul 24, 2026
Senville ELITE 12,000 BTU R-454B 208/230V (SENE-12EL-IHH / SENE-12EL-OH)
8.9 score / 12k / SEER2 29.4 / -22 F heating floor / 187-253V
Exact destination at Senville: $1,699.99, checked Jul 24, 2026
ACiQ Extreme 12,000 BTU R-454B 208/230V (ACIQ-12W-HH-MD / ACIQ-12ZPL-HP230C)
8.9 score / 12k / SEER2 25.4 / -22 F heating floor / 230V
Exact destination at HVACDirect: $1,649.99, checked Jul 26, 2026

Availability and price context

This system is sold through dealers, so its price comes as an installed quote that depends on your home. Get installation quotes to price it.

Source date

Model data sourced: Jul 20, 2026
Page reviewed: Jul 20, 2026
Source-backed records: 4
Newest source retrieved: Sep 12, 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

Install path: This is professional-install equipment; price it with an installed quote.
Structured ratings: Certification: ENERGY STAR certified and AHRI cold-climate designated. Refrigerant: R-410A. Minimum heating ambient: -13 F.

Strengths

Rated heating operation down to -13F - genuine cold-climate 1-ton capacity.
Mitsubishi Hyper-Heat engineering, dealer network, and reliability reputation.

Weaknesses

Lower seasonal efficiency (SEER2 21.7 / HSPF2 9.6) and 47F heat than the standard GS 12k - only worth it if you actually see deep cold.

Climate suitability

Minimum heating ambient: -13 F[1]
Heating capacity at −13°F: 8,720 BTU/h[3]
Certified heating at 5F: not published
Maximum heating at 5F (manufacturer): 12,300 BTU/h[1]
Rated heating at 17F: 7,600 BTU/h[1]
Rated heating at 47F: 12,300 BTU/h[1]

Specifications

Show

Manufacturer: Mitsubishi Electric
Brand: Mitsubishi Electric
Product line: M-Series GS
Model number: MSZ-GS12NA-U1 indoor / MUZ-GS12NAHZ-U1 outdoor
Indoor unit model: MSZ-GS12NA-U1
Outdoor unit model: MUZ-GS12NAHZ-U1
Number of zones: 1
Max indoor units: not published
Rated cooling capacity: 12,000 BTU/h[1]
Rated heating capacity: 12,300 BTU/h[1]
Voltage: 208/230V[1]
MCA: 10 A[1]
Maximum fuse or breaker size: 15 A[1]
Breaker needed: not published
SEER2: 21.7 SEER2[2]
EER2: 13.05 EER2[2]
HSPF2 (Region 4): 9.6 HSPF2[2]
HSPF2 (Region 5): not published
COP: not published
COP at 47F: 4.34 COP[1]
COP at 5F: 1.84 COP[1]
Minimum outdoor heating temperature: -13 F[1]
Minimum outdoor cooling temperature: 14 F[1]
Maximum outdoor temperature: 115 F[1]
Indoor noise range: cooling 19-22-30-37-45; heating 19-22-30-37-43[1]
Outdoor noise rating: 51 dBA[1]
Indoor weight: 23 lb[1]
Outdoor weight: 85 lb[1]
Refrigerant: R-410A[1]
Refrigerant charge: 41 oz[1]
Manufacturer coverage: not published
Line-set size: 1/4 in liquid / 3/8 in suction
Included line-set length: Line set supplied by the installer
Maximum line-set length: 65 ft[1]
Max line set per indoor: not published
Maximum elevation difference: 40 ft[1]
Max height between indoor units: not published
Wi-Fi support: supported[1]
Energy Star status: ENERGY STAR certified[1]
AHRI certification number: 207679253[2]
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. The limited warranty statement itself requires licensed-contractor installation and does not state an Internet/resale purchase-channel condition.
Install path: Professional install
Retail price: Installed quote only
Available retailers: not published
Manual links: MUY(Z)-GS engineering data book, MSY(Z)-GS06-15NA installation manual, METUS Residential M-Series, P-Series and SMART MULTI Limited Warranty Statement, MSZ-GS indoor service manual, MUY(Z)-GS outdoor service manual, MSZ-GS12NA & MUZ-GS12NAHZ submittal
Specification sheet: MSZ-GS12NA & MUZ-GS12NAHZ submittal
Last sourced date: Jul 20, 2026

Parts and filters

Fits Mitsubishi Electric M-Series GS Hyper-Heating 12k 230V (MSZ-GS12NA / MUZ-GS12NAHZ). Part numbers and fit notes identify compatibility only; no manufacturer endorsement is implied.

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