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18,000 BTU Carrier Infinity 21.5 SEER2 Single Zone Wall Mount Mini Split Heat Pump System – R454B | 230V

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Carrier

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Model

37MAHAQ18AA3 / 45MAHAQ18XA3

ID

213414

Was $3,740.00
Your Low Price $3,349.99
 
  • 18,000 BTU – cools up to 1,200 sq. ft.
  • 21.5 SEER2 – efficient for larger rooms
  • Adaptive Comfort
  • Sleep & Dehumidification Modes
  • Slim Wall-Mounted Design
  • 10-year limited parts warranty
Customize 18,000 BTU Carrier Infinity 21.5 SEER2 Single Zone Wall Mount Mini Split Heat Pump System – R454B | 230V
18,000 BTU Carrier Infinity Single Zone Mini Split Heat Pump Condenser - R454B
18,000 BTU Carrier Infinity Single Zone Mini Split Heat Pump Condenser - R454B
18,000 BTU Carrier Infinity Single Zone Mini Split Heat Pump Condenser - R454B   + $2,399.99
18,000 BTU Carrier Infinity Single Zone Mini Split Air Handler - R454B
18,000 BTU Carrier Infinity Single Zone Mini Split Air Handler - R454B
18,000 BTU Carrier Infinity Single Zone Mini Split Air Handler - R454B   + $950.00
Carrier Logo
Carrier Logo
Carrier Logo   + $0.00
 15 feet - 1/4" and 1/2" Line Set & Control Wire
Equipment Pad and Risers Kit
Installation Kit for Condensers
Cielo Breez Max Mini Split Thermostat with WiFi
18,000 BTU Carrier Infinity 25.8 SEER2 Single Zone Wall Mount Mini Split Heat Pump System – R454B | 230V – 37MAHAQ18AA3 / 45MAHAQ18XA3

$3,349.99

18,000 BTU Carrier Infinity Single Zone Wall Mount Mini Split Heat Pump System - R454B | 230V

The Carrier Infinity 18,000 BTU system is designed for spaces up to 750 sq. ft. Perfect for basements, family rooms, or open layouts.

Key Features

  • Covers ~600–750 sq. ft. — basements, family rooms, open layouts
  • High efficiency up to 21.5 SEER2
  • Quiet performance for its size
  • Strong output for larger rooms
  • Inverter (Variable Speed) Technology

Feature Highlights

Right-Sized Power

Delivers enough output for larger rooms while maintaining efficiency.

High Efficiency (21.5 SEER2)

Saves energy compared to traditional HVAC options.

Inverter (Variable Speed) Technology

Modulates output to maintain steady comfort.

What’s Included

  • Outdoor condenser — 18,000 BTU capacity, up to 21.5 SEER2
  • Indoor wall-mounted air handler — sized for ~750 sq. ft.
  • Wireless remote control
  • Installation manual

Recommended Accessories

  • Refrigerant line set (choose length based on installation)
  • Wall bracket or condenser pad
  • Wi-Fi adapter for smart control
  • Drain hose and insulation kit

Warranty

10-year limited parts warranty (with registration).

Installation Kit for Condensers

Ensure a professional and secure installation for your condenser with this comprehensive installation kit. Designed to provide all the essential components needed for a smooth setup, this kit helps protect your system while ensuring proper electrical and refrigerant connections.

What’s Included:

  • 3/4" x 6' Electrical Whip – SKU: 84138
  • 60A Non-Fused Disconnect – SKU: 83335
  • Surge Protector – SKU: ICM517
  • CPS Charging Adapter – SKU: 87-AD87
  • Telescoping Wall Sleeve – SKU: NFP-75

Equip your condenser with everything needed for a safe, durable, and professional installation. Order your Condenser Installation Kit today!

18,000 BTU Carrier Infinity Single Zone Mini Split Air Handler - R454B

Indoor unit sized for ~600–750 sq. ft. Provides quiet airflow and steady comfort.

  • Quiet airflow for living spaces
  • Clean wall-mount design
  • Even air distribution
  • Pairs with Carrier Infinity 18k condenser
18,000 BTU Carrier Infinity Single Zone Mini Split Heat Pump Condenser - R454B

Outdoor unit delivering 18,000 BTU for spaces up to ~750 sq. ft.

  • Up to 21.5 SEER2 efficiency
  • 18,000 BTU heating & cooling capacity
  • Durable outdoor design
  • Pairs with Carrier Infinity 18k air handler
Cielo Breez Max Mini Split Thermostat with WiFi

Introducing Cielo Breez Max, the ultimate smart thermostat for your mini-splits, designed to elevate your comfort with intelligent climate control. Transform your air conditioner into a smart powerhouse and manage your cooling or heating from anywhere using your phone. This award-winning device, available in black and white, prevents overheating or overcooling with AI-powered Comfy Max, while seamlessly detecting any mini-split brand for hassle-free setup.


Features:

  • Energy Savings
  • WiFi Connectivity
  • Weekly Schedule
  • Geofencing
  • Temperature Range Lock
  • Real-Time Notifications
  • HVAC Zoning

Weekly Schedule lets you set on and off periods throughout the week based on your needs.

Geofencing uses your smartphone's location to trigger actions in your system, such as turning the air conditioner on or off based on your proximity to home.

Temperature Range Lock ensures your air conditioner operates within a set temperature range for optimal comfort and efficiency.

Real-Time Notifications keep you informed with important updates, helping you manage your air conditioner better.

HVAC Zoning allows you to create customized temperature control zones by grouping multiple mini-split units.

The Cielo Breez Max offers innovative features and extraordinary performance, making it a perfect fit for any room air conditioner. Enjoy maximum energy savings and simplified home comfort with this advanced smart thermostat.

15 feet - 1/4" and 1/2" Line Set & Control Wire

Complete your mini-split installation with this convenient Line Set & Control Wire Bundle, designed to provide both the refrigerant lines and communication wire needed for reliable system performance. This bundle includes a heavy-duty 15-foot refrigerant line set with 1/4" liquid line and 1/2" suction line featuring durable flared ends for secure connections, along with a matching 15-foot 14/4 stranded copper control wire for dependable communication between indoor and outdoor mini-split components.

The insulated refrigerant lines help improve efficiency and durability, while the flexible control wire is built to withstand demanding HVAC installation environments. Ideal for ductless mini-split air conditioning and heat pump systems, this bundle helps simplify installation by combining two essential components into one convenient package.

What's Included

  • 15 ft. insulated refrigerant line set
  • 15 ft. 14/4 mini-split control wire
  • 1/4" liquid line with flared ends
  • 1/2" suction line with flared ends

Features

  • 1/2" thick insulation for improved efficiency
  • Heavy-duty refrigerant line construction
  • Stranded copper wire for reliable conductivity
  • Flexible and durable installation materials
  • Compatible with most mini-split systems
  • Ideal for HVAC installations and replacements
Carrier Logo
25 feet - 1/4" and 1/2" Line Set & Control Wire

Complete your mini-split installation with this convenient Line Set & Control Wire Bundle, designed to provide both the refrigerant lines and communication wire needed for reliable system performance. This bundle includes a heavy-duty 25-foot refrigerant line set with 1/4" liquid line and 1/2" suction line featuring durable flared ends for secure connections, along with a matching 15-foot 14/4 stranded copper control wire for dependable communication between indoor and outdoor mini-split components.

The insulated refrigerant lines help improve efficiency and durability, while the flexible control wire is built to withstand demanding HVAC installation environments. Ideal for ductless mini-split air conditioning and heat pump systems, this bundle helps simplify installation by combining two essential components into one convenient package.

What's Included

  • 25 ft. insulated refrigerant line set
  • 25 ft. 14/4 mini-split control wire
  • 1/4" liquid line with flared ends
  • 1/2" suction line with flared ends

Features

  • 1/2" thick insulation for improved efficiency
  • Heavy-duty refrigerant line construction
  • Stranded copper wire for reliable conductivity
  • Flexible and durable installation materials
  • Compatible with most mini-split systems
  • Ideal for HVAC installations and replacements
Equipment Pad and Risers Kit

E Lite Condenser Pad and Risers

E Lite Condenser Pad

E Lite Condenser Pad is designed to provide solid support for air conditioning condensers. It's made from sturdy polypropylene, striking a balance between lightness and stability. Its robust design ensures a level ground without the need for extra components.

Key Features:

  • Reliable Support: Abundance of ridges for stable ground support.
  • Durable and Lightweight: Tough yet not excessively heavy, thanks to polypropylene construction.
  • Anti-Slip: The surface prevents slipping, and rounded edges enhance safety.
  • Simple Appearance: Gray color with size labels.
  • Versatile Use: Suitable for condensers, pipes, ducts, cables, and more.

E Lite Risers

E Lite Risers complement the Condenser Pad, allowing you to adjust your setup as needed. They are constructed from weather-resistant PVC for outdoor use.

Key Features:

  • Weather Resistance: Made from tough PVC for long-lasting performance.
  • Secure Setup: The track securely holds bolts in place.
  • Bolts Included: Each set comes with two bolts.
  • Strong Support: Capable of handling loads of up to 397 pounds.

E Lite Condenser Pad and Risers offer reliable support without any complications. They are built to last and deliver efficient performance. Consider E Lite for your support needs – it's a practical solution for your projects.

No Return Policy

All sales of this product are final and are non-refundable.

30 feet - 1/4" and 1/2" Line Set & Control Wire

Complete your mini-split installation with this convenient Line Set & Control Wire Bundle, designed to provide both the refrigerant lines and communication wire needed for reliable system performance. This bundle includes a heavy-duty 30-foot refrigerant line set with 1/4" liquid line and 1/2" suction line featuring durable flared ends for secure connections, along with a matching 30-foot 14/4 stranded copper control wire for dependable communication between indoor and outdoor mini-split components.

The insulated refrigerant lines help improve efficiency and durability, while the flexible control wire is built to withstand demanding HVAC installation environments. Ideal for ductless mini-split air conditioning and heat pump systems, this bundle helps simplify installation by combining two essential components into one convenient package.

What's Included

  • 30 ft. insulated refrigerant line set
  • 30 ft. 14/4 mini-split control wire
  • 1/4" liquid line with flared ends
  • 1/2" suction line with flared ends

Features

  • 1/2" thick insulation for improved efficiency
  • Heavy-duty refrigerant line construction
  • Stranded copper wire for reliable conductivity
  • Flexible and durable installation materials
  • Compatible with most mini-split systems
  • Ideal for HVAC installations and replacements
21" Wall Mount Bracket

This wall mount bracket is perfect for outdoor mini split condensers. The length of the the wall bracket arms are 21" long. The condensing unit is mounted onto the L-shaped brackets and fastened using the bolts and anti-vibration washers provided.

Features:

  • 21" Arm Length
  • Weight capacity of 220 lbs per arm
  • Bolts and anti-vibration washers included

No Return Policy

All sales of this product are final and are non-refundable.

35 feet - 1/4" and 1/2" Line Set & Control Wire

Complete your mini-split installation with this convenient Line Set & Control Wire Bundle, designed to provide both the refrigerant lines and communication wire needed for reliable system performance. This bundle includes a heavy-duty 35-foot refrigerant line set with 1/4" liquid line and 1/2" suction line featuring durable flared ends for secure connections, along with a matching 35-foot 14/4 stranded copper control wire for dependable communication between indoor and outdoor mini-split components.

The insulated refrigerant lines help improve efficiency and durability, while the flexible control wire is built to withstand demanding HVAC installation environments. Ideal for ductless mini-split air conditioning and heat pump systems, this bundle helps simplify installation by combining two essential components into one convenient package.

What's Included

  • 35 ft. insulated refrigerant line set
  • 35 ft. 14/4 mini-split control wire
  • 1/4" liquid line with flared ends
  • 1/2" suction line with flared ends

Features

  • 1/2" thick insulation for improved efficiency
  • Heavy-duty refrigerant line construction
  • Stranded copper wire for reliable conductivity
  • Flexible and durable installation materials
  • Compatible with most mini-split systems
  • Ideal for HVAC installations and replacements
50 feet - 1/4" and 1/2" Line Set & Control Wire

Complete your mini-split installation with this convenient Line Set & Control Wire Bundle, designed to provide both the refrigerant lines and communication wire needed for reliable system performance. This bundle includes a heavy-duty 50-foot refrigerant line set with 1/4" liquid line and 1/2" suction line featuring durable flared ends for secure connections, along with a matching 50-foot 14/4 stranded copper control wire for dependable communication between indoor and outdoor mini-split components.

The insulated refrigerant lines help improve efficiency and durability, while the flexible control wire is built to withstand demanding HVAC installation environments. Ideal for ductless mini-split air conditioning and heat pump systems, this bundle helps simplify installation by combining two essential components into one convenient package.

What's Included

  • 50 ft. insulated refrigerant line set
  • 50 ft. 14/4 mini-split control wire
  • 1/4" liquid line with flared ends
  • 1/2" suction line with flared ends

Features

  • 1/2" thick insulation for improved efficiency
  • Heavy-duty refrigerant line construction
  • Stranded copper wire for reliable conductivity
  • Flexible and durable installation materials
  • Compatible with most mini-split systems
  • Ideal for HVAC installations and replacements
More Information
18,000 BTU Carrier Infinity Single Zone or Multi Zone Wall Mount Mini Split Air Handler – R454B | 230V
FeatureSpec
SKU45MAHAQ18XA3
Weight (in lbs)27.34
Brand/ManufacturerCarrier
UPC605468306840
Cooling BTU18,000 BTU
Heating BTU18,000 BTU
Maximum CFM294.3 - 635.7
Decibel Level (dBA)19.5 - 49.5
RefrigerantR454B
SEER2 (Efficiency)23.5
Electrical208-230V | 60 HZ | 1 Phase
BTU/Tonnage18,000 BTU/1.5 Ton
Mini Split TypeWall Mounted
Height12.56"
Width37.99"
Depth9.41"
WarrantyResidential Warranty: 10 Year Limited on Parts with Online Registration
Resources You will need Adobe® Acrobat® Reader to view PDF documents.
Safety InformationPROPOSITION 65 WARNING
18,000 BTU Carrier Infinity Single Zone or Multi Zone Mini Split Heat Pump Condenser – R454B | 230V
FeatureSpec
SKU37MAHAQ18AA3
Weight (in lbs)99.87
AHRI Certificate Number215323814
Brand/ManufacturerCarrier
UPC605468301012
Cooling BTU18,000 BTU
Heating BTU18,000 BTU
Maximum CFM1764.71
Decibel Level (dBA)59
RefrigerantR454B
SEER2 (Efficiency)21.5
Liquid Line1/4"
Suction Line1/2"
Electrical208-230V | 60 HZ | 1 Phase
Max Breaker Size20A
BTU/Tonnage18,000 BTU/1.5 Ton
Zone CompatibilitySingle Zone
Height26.5"
Width35.04"
Depth13.46"
WarrantyResidential Warranty: 10 Year Limited on Parts with Online Registration
Resources You will need Adobe® Acrobat® Reader to view PDF documents.
Safety InformationPROPOSITION 65 WARNING
E Lite Equipment Pad and Risers Kit 18" x 38" x 3"
FeatureSpec
SKU87762 / EL1838-3
Weight (in lbs)25
Brand/ManufacturerOnline Supply
UPCna
Height3"
Width18"
Depth38"
Safety InformationPROPOSITION 65 WARNING
Installation Kit for Condensers - Accessory Set
FeatureSpec
SKUMSK001
Weight (in lbs)15
Brand/ManufacturerOnline Supply
UPCna
Resources You will need Adobe® Acrobat® Reader to view PDF documents.
Safety InformationPROPOSITION 65 WARNING
Cielo Breez Max Mini Split Thermostat with WiFi
FeatureSpec
SKUBM101WA
Weight (in lbs)1
Brand/ManufacturerCielo
UPCna
ElectricalMicro USB with Standard Plug
Height4.25"
Width4.25"
Depth1"
Warranty1 Year Full Replacement
Resources You will need Adobe® Acrobat® Reader to view PDF documents.
Safety InformationPROPOSITION 65 WARNING
21" Wall Mount Bracket for Mini Split Systems
FeatureSpec
SKU230-B2L
Weight (in lbs)9.2
Brand/ManufacturerOnline Supply
UPC0095247127436
Length40"
Height3"
Width6"
Safety InformationPROPOSITION 65 WARNING
Refrigerant Line Set with 1/4" and 1/2" Line Ends & Control Wire - 15 feet
FeatureSpec
SKU201814 / CW-144-15
Weight (in lbs)15
Brand/ManufacturerOnline Supply
UPCna
Length15'
Height1/2"
Width1/2"
Safety InformationPROPOSITION 65 WARNING
Refrigerant Line Set with 1/4" and 1/2" Line Ends & Control Wire - 25 feet
FeatureSpec
SKU366400 / CW-144-25
Weight (in lbs)25
Brand/ManufacturerOnline Supply
UPCna
Length25'
Height1/2"
Width1/2"
Safety InformationPROPOSITION 65 WARNING
Refrigerant Line Set with 1/4" and 1/2" Line Ends & Control Wire - 30 feet
FeatureSpec
SKU216741 / CW-144-30
Weight (in lbs)30
Brand/ManufacturerOnline Supply
UPCna
Length30'
Height1/2"
Width1/2"
Safety InformationPROPOSITION 65 WARNING
Refrigerant Line Set with 1/4" and 1/2" Line Ends & Control Wire - 35 feet
FeatureSpec
SKU366401 / CW-144-35
Weight (in lbs)35
Brand/ManufacturerOnline Supply
UPCna
Length15'
Height1/2"
Width1/2"
Safety InformationPROPOSITION 65 WARNING
Refrigerant Line Set with 1/4" and 1/2" Line Ends & Control Wire - 50 feet
FeatureSpec
SKU366402 / CW-144-50
Weight (in lbs)45
Brand/ManufacturerOnline Supply
UPCna
Length50'
Height1/2"
Width1/2"
Safety InformationPROPOSITION 65 WARNING
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You're reviewing:18,000 BTU Carrier Infinity 21.5 SEER2 Single Zone Wall Mount Mini Split Heat Pump System – R454B | 230V
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Customer Questions
What happens if it arrives damaged?
If you are present during drop-off and you see obvious signs of damage or rough handling in transit - please ask the driver to wait while you inspect the equipment. If it is damaged badly enough that you believe it can not function, you have the right to refuse the damaged portion of the shipment. If you discover the damage after the driver has left, take photos of the damage and send them to customerservice@hvacdirect.com. Please refer to your order number in the email. This starts the process and one of our representatives will be in touch with you promptly.
How can I find an installer?
It’s easier than you think – the key is to find an independent contractor or small company as opposed to a larger HVAC service. A one or two person outfit will do the work more quickly and cheaply than a bigger company, too. Yelp.com, Thumbtack.com, and Porch.com are websites are designed to help you connect with a professional in your area. You could also place a call to the last professional who did work on your home and see if they have any recommendations.
Who makes Carrier mini splits?
Carrier mini splits come from one of the most recognized names in HVAC, offering reliable, energy-efficient solutions for year-round comfort.
Can I install a Carrier mini split myself, or do I need a professional?
Carrier mini splits require professional installation. A licensed HVAC contractor ensures proper sizing, refrigerant handling, and warranty protection.
What kind of warranty comes with a Carrier mini split?
Most Carrier mini splits include a 10-year limited parts warranty when registered, giving you long-term peace of mind. Warranty terms may vary by model and installer.
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