When an HVAC system needs a new component, the real decision is not just "which brand" but "which exact part." The four Carrier parts here cover very different jobs: a smart sensor, a knob, and two blower wheels. All are listed as new, genuine OEM parts, but their prices span from about $22 to over $412, so choosing based on the repair is essential.
Quick take
The Carrier SYSTXZNSMS01 smart sensor is the most expensive option in this lineup and is designed for whole-house AC/heater sensor work. The Carrier Hvac 336901-401 knob is the simplest and least expensive part. The Carrier Hvac LA22ZA120 and Carrier Hvac LA22LA014 are blower wheels with different dimensions. Match the component to the symptom, not the other way around.
Listed price comparison
| Product | Listed Price | Price Bar |
|---|---|---|
| Carrier SYSTXZNSMS01 -- Genuine OEM HVAC Replacement Part | USD 412.19 | |
| Carrier Hvac LA22ZA120- Genuine OEM Replacement Part | USD 194.73 | |
| Carrier Hvac LA22LA014- Genuine OEM Replacement Part | USD 96.94 | |
| Carrier Hvac 336901-401- Genuine OEM Replacement Part | USD 21.98 |
Decision matrix
- Carrier SYSTXZNSMS01: Best for replacing a smart sensor tied to a whole-house air conditioner and heater. Keep in mind it is the most expensive part in this lineup.
- Carrier Hvac 336901-401: Best for a simple knob replacement. Keep in mind it is single-purpose and does not handle the sensor or blower-wheel roles above.
- Carrier Hvac LA22ZA120: Best for a blower wheel with the larger listed dimensions. Keep in mind the fit is size-specific.
- Carrier Hvac LA22LA014: Best for a blower wheel with the smaller listed diameter. Keep in mind it only makes sense if those dimensions match.
Product notes
Carrier SYSTXZNSMS01 -- Genuine OEM HVAC Replacement Part
The SYSTXZNSMS01 is the most specialized part in this group: a smart sensor from Carrier's Infinity System line, designed for a whole-house air conditioner and heater. It is the highest-priced option here, which makes sense for a component that is tied to system-level sensing rather than mechanical repair. Choose it when the job calls for replacing the sensor itself in a whole-house setup. The limitation is simple: at this price point, it is not a part you pick casually. It should be reserved for cases where the sensor itself is the component being replaced.
Carrier Hvac 336901-401- Genuine OEM Replacement Part
The 336901-401 is a new Carrier Hvac knob and the most straightforward replacement in this lineup. It carries the lowest listed price among the four parts, and it is made in the United States. That makes it a practical first choice when the repair is as direct as a missing or worn knob. The limitation is its narrow purpose. This part is limited to knob replacement; it is not a blower wheel or a sensor. If the system is not responding correctly and a knob swap is only part of the symptom, this part will not resolve the underlying issue.
Carrier Hvac LA22ZA120- Genuine OEM Replacement Part
The LA22ZA120 is a blower wheel from Carrier Hvac, listed as a new genuine OEM replacement part. Its described size is an 11" x 11" wheel with a 1/2" bore, so it is a candidate when you are replacing a wheel that matches those exact dimensions. Its price sits in the middle of this group, and it is made in the United States. The main limitation is fit. Because the size is specific, you need to confirm that the existing wheel matches before choosing it. If you are working with a smaller diameter or a different width, this wheel would not be the right match.
Carrier Hvac LA22LA014- Genuine OEM Replacement Part
The LA22LA014 is the other blower wheel, described as 10 3/4" in diameter and 9 3/8" in width. It is priced below the LA22ZA120, so it is the less expensive option within the blower-wheel pair. This part is also a new genuine OEM piece from Carrier Hvac, made in the United States. It fits the same general role as the LA22ZA120, but only when the dimensions line up with the wheel being replaced. The limitation is that same size sensitivity: it is not a universal blower wheel, and it should only be selected when the 10 3/4" diameter and 9 3/8" width match the original component.
Final recommendation by use case
If the repair is a missing or worn knob, go with the Carrier Hvac 336901-401. If the issue is the system sensor in a whole-house AC/heater setup, the Carrier SYSTXZNSMS01 is the part built for that role, even at its higher price. For blower wheel work, measure first and then pick between the Carrier Hvac LA22ZA120 (11" x 11" with a 1/2" bore) and the Carrier Hvac LA22LA014 (10 3/4" diameter, 9 3/8" width). The right choice comes down to confirming the exact component your system needs, not chasing a single price point.
