Carrier Infinity 18 Central Air Conditioners | FurnaceCompare®

Carrier Infinity 18 Air Conditioner Overview

The Carrier Infinity 18 is a discontinued high efficiency air conditioner. Offering up to 18 SEER when paired with compatible components, this series used Puron refrigerant and was available in 2- to 5-ton models.

Features of the 38TDB included a 2-speed compressor, the company’s proprietary “Silencer System” to maintain quiet operation as low as 69 decibels, and an on-board self-diagnostic system for quick maintenance. A copper tube aluminum fin coil, high and low pressure switches, and liquid line filter drier were additional components of this series.

The exterior of the unit was protected with Carrier’s WeatherArmor System, including a condenser grille guard, powder paint finish, and ceramic-coated cabinet screws. Optional accessories such as a low-pressure and high-pressure switch kit were also available.The Infinity 18 air conditioner was part of the Carrier Infinity series.

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Consumer Reviews of Carrier Infinity 18


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #5 of 10 Carrier Air Conditioner
  • 0% of customers recommended

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Carrier Infinity 18 Air Conditioner Reviews

Showing 6-6 of 6 reviews

"Pure Lemon"

1.0 rating
Very Unsatisfied

Has caused us nothing but money. replaced 2 compressors, a condensor switch and a fan motor. Carrier should give us a better unit and pay all installation. I do not recommend or will we buy one again.



Other Infinity 18 Reviews

As a commercial unit, the 38TDB Infinity has very few consumer reviews across the web. However, the Carrier Infinity air conditioning series has a strong presence on review sites and forums. Several review sites, including and, recommend these systems for homeowners in warmer climates because of the unit’s high efficiency and durability.

Homeowners and contractors on also are pleased with Carrier’s top-of-the-line Infinity units. Although several homeowners mention the installation took more than a day and the unit’s high price point, other consumers report a noticeable decrease in their utility bill with the new unit. With minimal troubleshooting issues reported across the web, professionals also note very little issues with these systems when properly installed.

Carrier Infinity 18 Model Numbers

The Infinity 18 is available in different models which vary in efficiency and capacity.

Model Number SEER BTUs per Hour
38TDB02430 15 24,000
38TDB03630 16.5 36,000
38TDB03730 18 37,000
38TDB04830 15 47,500
38TDB06031 15 60,000

Infinity 18 Warranty

Carrier provides a 10-year limited warranty for the unit’s compressor and a standard 5-year limited warranty for remaining parts. Products must be registered with Carrier online within 90 days of installation. Extended warranties also are available.

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