This is the outdoor condenser unit only — Carrier model 37MAHAQ24AA3, a 24,000 BTU/h variable-speed heat pump condenser from the Infinity 27 (37MAHA) family. It is designed for homeowners or contractors assembling a single-zone ductless heat pump system; the matching indoor head, line set, and mounting accessories are sold separately.
Note: If you would like to review the manufacturer Product Specifications, Warranty, Brochure, etc., for this system, please refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
The 37MAHAQ24AA3 is the outdoor half of Carrier's Infinity 27 (37MAHA) single-zone ductless heat pump lineup, rated at 24,000 BTU/h cooling with a variable-speed inverter-driven compressor. AHRI system ratings for this size (21.2 SEER2, up to 13.5 HSPF2 IV) are established with a matched Carrier indoor head; specific matched indoor model numbers were not provided in the source data and are marked [NEEDS VERIFICATION] below. This unit uses R-454B (Puron Advance) refrigerant and is not a self-contained system — it requires a compatible indoor unit and professional line set installation.
- Outdoor Condenser: Carrier 37MAHAQ24AA3 (family 37MAHA), 24,000 BTU/h rated cooling capacity, variable-speed compressor, R-454B refrigerant.
- Indoor Unit: Not included with this listing — matched Carrier indoor head sold separately. Specific compatible indoor model numbers: [NEEDS VERIFICATION].
- Voltage: 208/230V, 1-Phase, 60Hz — dedicated circuit required.
- Minimum Circuit Ampacity (MCA): 24.9A. Maximum Overcurrent Protection (MOP): 25A.
- Line Set Sizing: 3/8 in (9.52mm) liquid line; 5/8 in (15.9mm) suction line. Line Set Sold Separately.
- Not Compatible With: 115V-only circuits.
- Not Included: Indoor unit, line set, wall sleeve, mounting bracket, refrigerant, and low-voltage control wiring.
- Installation: Professional installation is required — this unit uses R-454B (A2L, mildly flammable classification) refrigerant and is not a pre-charged DIY system.
Pro-Installer Tip: Flare connections on R-454B systems demand full attention to torque spec and cleanliness — a loose or under-torqued flare joint on the 3/8 in liquid line is a common source of slow refrigerant loss and nuisance low-charge faults down the road. Use a calibrated digital torque wrench matched to the flare nut size rather than "feel," and confirm the joint with a soap-bubble or electronic leak detector before evacuation. This protects long-term charge integrity and system efficiency. Per EPA Section 608, only certified technicians may handle refrigerant during evacuation, charging, and recovery on this system.
- Variable-speed inverter compressor for closer temperature control than fixed-speed units.
- Outdoor sound pressure as low as 61.5 dBA at this 24K size.
- Puron Advance (R-454B) refrigerant, rated at 75% lower global warming potential than legacy refrigerants.
- ENERGY STAR certified at the system level (with matched indoor head).
- Continues delivering rated heating capacity at 17°F and 5°F outdoor test conditions per manufacturer data.
| Spec | Value | Unit |
|---|---|---|
| Cooling Rated Capacity (DOE A2, 95°F) | 24000 | BTU/h |
| Heating Rated Capacity (DOE H12, 47°F) | 29000 | BTU/h |
| Heating Rated Capacity (DOE H32, 17°F) | 21000 | BTU/h |
| Heating Rated Capacity (ODE H42, 5°F) | 24200 | BTU/h |
| SEER2 | 21.2 | Btu/h.W |
| EER2 (DOE A2, 95°F) | 13 | Btu/h.W |
| HSPF2 IV | 13.5 | Btu/h.W |
| HSPF2 V | 9.8 | Btu/h.W |
| Voltage | 208/230; 1Ph; 60 | V;Ph;Hz |
| MCA (Minimum Circuit Ampacity) | 24.9 | A |
| MOP (Maximum Overcurrent Protection) | 25 | A |
| Outdoor Sound Pressure Level | 61.5 | dBA |
| Net Weight | 130.29 | lbs |
| Refrigerant Type | R-454B | — |
| Liquid Pipe Size | 3/8 (9.52mm) | in |
| Suction Pipe Size | 5/8 (15.9mm) | in |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
- Compatible with dedicated 208/230V, 1-phase, 60Hz circuits only.
- Not compatible with 115V-only circuits.
- Must be matched to a Carrier indoor head listed for use with the 37MAHA outdoor family; specific matched indoor model numbers are [NEEDS VERIFICATION] from the manufacturer data provided.
- Line set, indoor unit, wall sleeve, and mounting bracket are NOT included and must be purchased separately.
- This listing is the outdoor condenser only — it is not a complete ductless system by itself.
What breaker size do I need for this system?
The 37MAHAQ24AA3 outdoor unit has a Minimum Circuit Ampacity (MCA) of 24.9A and a Maximum Overcurrent Protection (MOP) rating of 25A, on a dedicated 208/230V, 1-phase, 60Hz circuit.
Is professional installation required to keep the warranty valid, or is this a true DIY kit?
This is not a DIY kit. This unit uses R-454B (A2L) refrigerant and requires professional installation by a licensed HVAC contractor. It is not a pre-charged quick-connect system.
Is the line set included, and if not, what size do I need to buy?
The line set is sold separately. For the 37MAHAQ24AA3, use a 3/8 in (9.52mm) liquid line and a 5/8 in (15.9mm) suction line.
Does this system work in cold climates (low-ambient heating)?
The manufacturer data lists a Heating Rated Capacity at DOE H32 (17°F) of 21,000 Btu/h and at ODE H42 (5°F) of 24,200 Btu/h for this model, indicating continued heating output at low outdoor temperatures. Full operating temperature range limits beyond these test points are [NEEDS VERIFICATION].
What indoor unit does this outdoor condenser pair with?
This listing is for the outdoor condenser (37MAHAQ24AA3) only. A matched Carrier indoor head must be selected separately; specific matched indoor model numbers are [NEEDS VERIFICATION] from the data provided.
Installation by a licensed HVAC professional is required to maintain warranty. This unit uses R-454B (A2L) refrigerant, and EPA Section 608 certification is required for anyone handling refrigerant during installation or service. Carrier's Consumer Choice Warranty, upon timely registration, offers eligible equipment either a 10-year parts-only limited warranty or a 5-year parts plus 3-year labor limited warranty; terms depend on registration and professional installation as documented in the manufacturer warranty materials referenced in the Resources tab.
