SplitAtlas

Carrier / Performance 25

Carrier Performance 25 18k R-454B 208/230V 3-Zone Mini-Split

Certified capacity
18,000 BTU/h[2]
SEER2
25.2 SEER2[2]
Heating floor
-13 F[4]
Voltage
230 V[1]
Install path
Professional install

The Carrier Performance 25 3-Zone 18k (37MGRAQ18CA3) is Carrier's standard-tier multi-zone: three indoor heads on one 208/230V outdoor unit, dealer-quoted through Carrier's installer network rather than sold as buyable equipment. Its certified nominal SEER2 of 25.2 is among the highest multi-zone efficiency we list, alongside EER2 14 and HSPF2 9.8.

It is ENERGY STAR certified and AHRI cold-climate designated, on current low-GWP R-454B refrigerant. Cooling is rated at 18000 BTU, with heating of 19000 BTU at 47F, 16000 at 17F, and 13500 at 5F.

Professional installation required.

3 zonesProfessional installCurrent

Refrigerant generation

R-454B - current-generation refrigerant

Error Codes
Carrier Performance 25 3-Zone 18,000 BTU R-454B 208/230V (37MGRAQ18CA3)

Image: Carrier

Data completeness: 95%
Last sourced
Jul 28, 2026

SplitAtlas score

8.4 / 10

Methodology
Cooling efficiencyTop 10%

(25.2 SEER2) among 18k systems

Heating efficiencyBelow average

(9.8 HSPF2) among 18k systems

Cold-weather performanceBelow average

(71.1% heat retained at 5F; -13 F heating floor) among 18k systems

WarrantyAbove average

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

Feature setTop quartile

(6 verified features) across the catalogue

Documentation & partsBottom quartile

(7 manuals) 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

    quote-only - no retail price to evaluate

Key ratings

Rated cooling

18,000BTU/hNon-Ducted Indoor Units[2]

Rated heating

19,000BTU/hNon-Ducted Indoor Units[2]

Best-fit use cases

A three-room home wanting Carrier's highest-efficiency standard multi-zone through a dealer; buyers who also want deep-cold heat that holds and buyable equipment should look at the matching Infinity 25 3-Zone.

Buyer review snapshot

Best for / skip if

Best for

  • 3-zone projects in the 18k outdoor capacity class.
  • Top efficiency shortlists; SEER2 is 25.2.

Install difficulty

Professional flared-line install
  • Electrical: 230V; MCA 16 A; breaker/fuse 20 A.
  • Line set: Flared line connections; precharged 24.6 ft; max 196.9 ft.
  • 3-zone condenser; indoor-head matching and branch layout are part of the job.

Availability and price context

We could not verify a current retail price for this model. We could not find this exact model in stock at a retailer we work with when we last checked on 2026-07-28.

Purchase channel policy

Carrier's ductless warranty excludes products purchased over the Internet; buyers should treat public online carts as outside the warranty-covered purchase channel.

Warranty consequence
Warranty coverage does not apply to any product purchased over the Internet.
Authorized channel
Licensed HVAC technician installation with defective parts returned to the distributor through a registered servicing dealer; not an internet purchase.

Any online offer for this brand should be treated as a warranty-risk warning, not a recommendation.

Compare online-purchase warranty rules by brand

Source: Carrier Corporation: CAC/BDP Limited Warranty Certificate - Limited Warranty for Ductless Split Units; retrieved Aug 15, 2026.

Source date

Model data sourced
Jul 28, 2026
Page reviewed
Jul 28, 2026
Source-backed records
4
Newest source retrieved
Jul 28, 2026

Warranty tiers

Warranty: 10 years parts and no separate compressor term published as standard.

Review methodology

Model context

Structured ratings
Certification: ENERGY STAR certified and AHRI cold-climate designated. Refrigerant: current low-GWP R-454B. Minimum heating ambient: -13 F.

Strengths

  • Class-leading efficiency: certified nominal SEER2 25.2, among the highest multi-zone we list.
  • Three zones from one condenser, ENERGY STAR certified.
  • AHRI cold-climate designated on current low-GWP R-454B.
  • Backed by Carrier, a major, trusted US HVAC brand and dealer network.

Weaknesses

  • Dealer-quoted, not buyable equipment - you get an installer quote, not a priced condenser.
  • Heating output tapers in deep cold (16000 BTU at 17F, 13500 at 5F).
  • Multi-zone part-load penalty when only one head is running.

Climate suitability

Minimum heating ambient
-13 F[4]
Rated heating at 5F
13,500 BTU/hNon-Ducted Indoor Units[2]
Rated heating at 17F
16,000 BTU/hNon-Ducted Indoor Units[2]
Rated heating at 47F
19,000 BTU/hNon-Ducted Indoor Units[2]

Specifications

Show
Manufacturer
Carrier
Brand
Carrier
Product line
Performance 25
Model number
37MGRAQ18CA3
Indoor unit model
Indoor heads are selected separately on a multi-zone system
Outdoor unit model
37MGRAQ18CA3
Number of zones
3
Max indoor units
3 units[1]
Rated cooling capacity
18,000 BTU/hNon-Ducted Indoor Units[2]
Rated heating capacity
19,000 BTU/hNon-Ducted Indoor Units[2]
Voltage
230 V[1]
MCA
16 A[1]
Maximum fuse or breaker size
20 A[1]
Breaker needed
not published
SEER2
25.2 SEER2Non-Ducted Indoor Units[2]
EER2
14 EER2Non-Ducted Indoor Units[2]
HSPF2 (Region 4)
9.8 HSPF2Non-Ducted Indoor Units[2]
HSPF2 (Region 5)
Certified per indoor-unit combination, not per outdoor unit
COP
not published
COP at 47F
not published
COP at 5F
2.3 COPNon-Ducted Indoor Units[2]
Minimum outdoor heating temperature
-13 F[4]
Minimum outdoor cooling temperature
-13 F[4]
Maximum outdoor temperature
122 F[4]
Indoor noise range
Indoor heads are selected separately on a multi-zone system
Outdoor noise rating
59.5 dBA[1]
Indoor weight
Indoor heads are selected separately on a multi-zone system
Outdoor weight
100.53 lb[1]
Refrigerant
R-454B[2]
Refrigerant charge
61.76 oz[1]
Manufacturer coverage
not published
Line-set size
1/4 in x 3 liquid / 3/8 in x 3 suction
Included line-set length
Indoor heads are selected separately on a multi-zone system
Maximum line-set length
196.9 ft[1]
Max line set per indoor
98.4 ft[1]
Maximum elevation difference
49.21 ft[1]
Max height between indoor units
33 ft[1]
Wi-Fi support
Indoor heads are selected separately on a multi-zone system
Energy Star status
ENERGY STAR certified[3]
AHRI certification number
215357470Non-Ducted Indoor Units[2]
Warranty
Standard: 10 yr parts / no separate compressor term (Consumer Choice 10-year parts-only option). Consumer Choice Warranty: 10-year parts-only option or 5-year parts plus 3-year labor option
Install path
Professional install
Retail price
We could not find this exact model in stock at a retailer we work with when we last checked on 2026-07-28.
Available retailers
not published
Manual links
AHRI public detail 215357470, ENERGY STAR exact row 215357470, Performance 25 Carrier ductless current brochure, Carrier Ductless Systems compatibility charts, Carrier Performance 25 Multi-Zone Mini Split Heat Pump, HVACDirect exact-offer audit for 37MGRAQ18CA3, Carrier R-454B ductless Consumer Choice Warranty
Specification sheet
not published
Last sourced date
Jul 28, 2026

Electrical requirements

Show
Voltage
230 V[1]
Voltage range
208/230V[1]
Phase
1[1]
Frequency
60 Hz[1]
MCA
16 A[1]
Breaker needed
not published
Maximum breaker size
20 A[1]
Maximum fuse size
20 A[1]
Maximum cooling current
not published
Maximum heating current
not published
Manufacturer wire notes
not published

Installation considerations

Show
Liquid line
1/4 in x 3[1]
Suction line
3/8 in x 3[1]
Line connection type
Flared line connections[1]
Precharged length
24.6 ft[1]
Included line-set length
Indoor heads are selected separately on a multi-zone system
Maximum line-set length
196.9 ft[1]
Max line set per indoor
98.4 ft[1]
Max height between indoor units
33 ft[1]
Indoor dimensions
Indoor heads are selected separately on a multi-zone system
Outdoor dimensions
35.04 x 13.46 x 26.5 in[1]
Indoor weight
Indoor heads are selected separately on a multi-zone system
Outdoor weight
100.53 lb[1]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Carrier Performance 25 3-Zone 18,000 BTU R-454B 208/230V (37MGRAQ18CA3) myself, or do I need a pro?
Carrier Performance 25 3-Zone 18,000 BTU R-454B 208/230V (37MGRAQ18CA3) 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 Carrier Performance 25 3-Zone 18,000 BTU R-454B 208/230V (37MGRAQ18CA3) keep heating in a cold winter?
The manufacturer publishes 13,500 BTU/h of heating output at 5F. Rated heating operation extends down to -13 F. Certified heating efficiency is 9.8 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 Carrier Performance 25 3-Zone 18,000 BTU R-454B 208/230V (37MGRAQ18CA3) need?
Published electrical requirements: 230 V voltage, 16 A minimum circuit ampacity, and 20 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 196.9 ft, and the included line set comes pre-charged for 24.6 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 Carrier Performance 25 3-Zone 18,000 BTU R-454B 208/230V (37MGRAQ18CA3) carry?
The manufacturer publishes these warranty tiers: Standard: 10 yr parts / no separate compressor term (Consumer Choice 10-year parts-only option). Registration requirements and proof of qualified installation commonly affect coverage, so read the warranty terms before install day.

Data sources

Show
  1. Carrier Corporation: Carrier Performance 25 37MG multi-zone compatibility and technical evidenceSourced - manufacturer technical document

    Covers Frequency, Maximum breaker size, Maximum fuse size, Minimum circuit ampacity, Phase, Voltage and more

  2. Air-Conditioning, Heating, and Refrigeration Institute: AHRI public detail 215357470Sourced - AHRI directory

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

  3. U.S. Environmental Protection Agency ENERGY STAR: ENERGY STAR exact row check for AHRI 215357470Sourced - Energy Star listing

    Covers Energy Star status

  4. Carrier Corporation: Carrier Performance 25 Multi-Zone Mini Split Heat PumpSourced - manufacturer product page

    Covers Minimum outdoor cooling temperature, Minimum outdoor heating temperature, Maximum outdoor temperature, Legacy compressor warranty value, Legacy warranty value, Standard compressor warranty status and more

Last updated

Jul 28, 2026