SplitAtlas

Carrier / Infinity 35

Carrier Infinity 35 9k R-454B 208/230V Mini-Split

Certified capacity
9,000 BTU/h[2]
SEER2
33.5 SEER2[2]
Heating floor
-22 F[1]
Voltage
230 V[1]
Install path
Professional install

A 9,000 BTU Infinity 35 hyper-heat head on 230V and R-454B, rated 33.5 SEER2, 17 EER2, and 14.6 HSPF2. Certified heating is 12,000 BTU at 47F, 11,000 BTU at 17F and 13,500 BTU at 5F. It is ENERGY STAR certified and cold-climate designated.

1 zoneProfessional installCurrent

Refrigerant generation

R-454B - current-generation refrigerant

This brand doesn't honor its warranty on systems bought online. Buy it through a local contractor who installs it: get quotes from installers in your area, and ask whether they're an authorized dealer for this brand.

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Error Codes
Carrier Infinity 35 9,000 BTU R-454B 208/230V (45MPHAQ09XA3 / 37MPRAQ09AA3)

Image: Carrier

Data completeness: 100%
Last sourced
Jul 27, 2026

SplitAtlas score

9.3 / 10

Methodology
Cooling efficiencyTop 10%

(33.5 SEER2) among <=9k systems

Heating efficiencyTop 10%

(14.6 HSPF2) among <=9k systems

Cold-weather performanceTop quartile

(5F certified capacity: 100% of the 47F rating; -22 F heating floor) among <=9k systems

WarrantyAbove average

(10 yr parts, no separate compressor term) across the catalogue

Feature setAbove average

(6 verified features) across the catalogue

Documentation & partsBelow average

(6 manuals; spec sheet) 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

9,000BTU/h[2]

Rated heating

12,000BTU/h[2]

Buyer review snapshot

Best for / skip if

Best for

  • Top efficiency shortlists; SEER2 is 33.5.

Install difficulty

Professional install
  • Electrical: 230V.

Availability and price context

  • Carrier doesn't honor its warranty on systems bought online. Buy it through an authorized dealer or contractor.

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 27, 2026
Page reviewed
Jul 27, 2026
Source-backed records
4
Newest source retrieved
Jul 27, 2026

Warranty tiers

Registered
10 yr parts / no separate compressor term - eligible timely registered residential installation
Dealer alternative
5 yr parts / no separate compressor term - Consumer Choice dealer alternative: 5-year parts plus 3-year labor through a participating dealer

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: -22 F.

Strengths

  • Flagship-level 33.5 SEER2 and 17 EER2 for elite year-round efficiency.
  • Hyper-heat class: 13,500 BTU certified at 5F, above its 47F rating - ideal for the coldest conditions.
  • Cold-climate and ENERGY STAR certified, backed by Carrier's premium warranty network.

Weaknesses

  • Flagship pricing that is hard to justify outside genuinely cold climates.
  • 230V only, requiring the correct dedicated circuit.

Climate suitability

Minimum heating ambient
-22 F[1]
Certified heating at 5F
13,500 BTU/h[2]
Rated heating at 17F
11,000 BTU/h[2]
Rated heating at 47F
12,000 BTU/h[2]

Specifications

Show
Manufacturer
Carrier
Brand
Carrier
Product line
Infinity 35
Model number
45MPHAQ09XA3 indoor / 37MPRAQ09AA3 outdoor
Indoor unit model
45MPHAQ09XA3
Outdoor unit model
37MPRAQ09AA3
Number of zones
1
Max indoor units
not published
Rated cooling capacity
9,000 BTU/h[2]
Rated heating capacity
12,000 BTU/h[2]
Voltage
230 V[1]
MCA
Not published for this model
Maximum fuse or breaker size
Not published for this model
Breaker needed
not published
SEER2
33.5 SEER2[2]
EER2
17 EER2[2]
HSPF2 (Region 4)
14.6 HSPF2[2]
HSPF2 (Region 5)
not published
COP
not published
COP at 47F
not published
COP at 5F
2 COP[2]
Minimum outdoor heating temperature
-22 F[1]
Minimum outdoor cooling temperature
Not published for this model
Maximum outdoor temperature
122 F[1]
Indoor noise range
Not published for this model
Outdoor noise rating
Not published for this model
Indoor weight
Not published for this model
Outdoor weight
Not published for this model
Refrigerant
R-454B[2]
Refrigerant charge
not published
Manufacturer coverage
not published
Line-set size
Not published for this model liquid / Not published for this model suction
Included line-set length
Professional installations use separately selected line sets
Maximum line-set length
Not published for this model
Max line set per indoor
not published
Maximum elevation difference
Not published for this model
Max height between indoor units
not published
Wi-Fi support
Not published for this model
Energy Star status
ENERGY STAR certified[3]
AHRI certification number
215413142[2]
Warranty
Registered: 10 yr parts / no separate compressor term (eligible timely registered residential installation); Dealer alternative: 5 yr parts / no separate compressor term (Consumer Choice dealer alternative: 5-year parts plus 3-year labor through a participating dealer). Score uses Registered. Additional published terms are shown for reference and not counted in the score.. Consumer Choice Warranty: 10-year parts-only or 5-year parts plus 3-year labor for eligible timely registered residential installations; terms and participating dealer requirements apply.
Install path
Professional install
Retail price
online listing with warranty risk: $3,599.99
Available retailers
HVACDirect
Manual links
AHRI public directory record 215413142, ENERGY STAR exact check 215413142, Infinity 35 installation documentation locator, Carrier Infinity 35 Mini Split Heat Pump with Basepan Heater, AHRI Appendix M1 public detail 215413142
Specification sheet
AHRI Appendix M1 public detail 215413142
Last sourced date
Jul 27, 2026

Retail purchase context

Warranty consequence

Warranty coverage does not apply to any product purchased over the Internet.

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

Authorized channel: Licensed HVAC technician installation with defective parts returned to the distributor through a registered servicing dealer; not an internet purchase.

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

Paid link

Warranty-risk online listing

Last seen at HVACDirect on Jul 27, 2026: $3,600

View listing at HVACDirect

Electrical requirements

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

Installation considerations

Show
Liquid line
Not published for this model
Suction line
Not published for this model
Line connection type
not published
Precharged length
not published
Included line-set length
Professional installations use separately selected line sets
Maximum line-set length
Not published for this model
Max line set per indoor
not published
Max height between indoor units
not published
Indoor dimensions
Not published for this model
Outdoor dimensions
Not published for this model
Indoor weight
Not published for this model
Outdoor weight
Not published for this model
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Carrier Infinity 35 9,000 BTU R-454B 208/230V (45MPHAQ09XA3 / 37MPRAQ09AA3) myself, or do I need a pro?
Carrier Infinity 35 9,000 BTU R-454B 208/230V (45MPHAQ09XA3 / 37MPRAQ09AA3) 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 Infinity 35 9,000 BTU R-454B 208/230V (45MPHAQ09XA3 / 37MPRAQ09AA3) keep heating in a cold winter?
The AHRI/ENERGY STAR certification lists 13,500 BTU/h of heating capacity at 5F. Rated heating operation extends down to -22 F. Certified heating efficiency is 14.6 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 Infinity 35 9,000 BTU R-454B 208/230V (45MPHAQ09XA3 / 37MPRAQ09AA3) need?
Published electrical requirements: 230 V voltage. Confirm the final circuit against the unit nameplate and local code with a licensed electrician.
What warranty does the Carrier Infinity 35 9,000 BTU R-454B 208/230V (45MPHAQ09XA3 / 37MPRAQ09AA3) carry?
The manufacturer publishes these warranty tiers: Registered: 10 yr parts / no separate compressor term (eligible timely registered residential installation); Dealer alternative: 5 yr parts / no separate compressor term (Consumer Choice dealer alternative: 5-year parts plus 3-year labor through a participating dealer). 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. Carrier Corporation: Carrier Infinity 35 Mini Split Heat Pump with Basepan HeaterSourced - manufacturer product page

    Covers Frequency, Phase, Voltage, Voltage range, Minimum outdoor heating temperature, Maximum outdoor temperature and more

  2. Air-Conditioning, Heating, and Refrigeration Institute: AHRI Appendix M1 public detail for 37MPRAQ09AA3 / 45MPHAQ09XA3Sourced - AHRI directory

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

  3. ENERGY STAR: ENERGY STAR exact row check for AHRI 215413142Sourced - Energy Star listing

    Covers Energy Star status

  4. HVACDirect: HVACDirect exact Carrier offer for 37MPRAQ09AA3 / 45MPHAQ09XA3Sourced - retailer listing

    Covers Retail price

Last updated

Jul 27, 2026