Quick verdict
When an air conditioner needs a replacement part, the key decision is not simply which option costs less-it is whether the repair calls for a display box assembly or an air filter. The Comfort Aire Air Conditioner Part # 17220300A17150 - Display Box Subassy Box is the focused pick for several Comfort-Aire REG models, including REG-123L, REG-123M, REG-183J, and REG-81L. The Comfort Aire Air Conditioner Part # 12120300005844 - Air Filter is a 7-1/2 × 13 filter intended for a different group of units, including Comfort-Aire RG, RAD, and RADS models.
The listed-price gap is $28.64, but these are functionally different parts rather than interchangeable alternatives. Start with the replacement part type and the model family associated with your air conditioner.
At a glance
| Replacement part | Listed price | Key description | Named compatible examples |
|---|---|---|---|
| Comfort Aire 17220300A17150 Display Box Subassy Box | $42.17 | Display Box Subassy Box | Comfort-Aire REG-123L, REG-183J, REG-81M |
| Comfort Aire 12120300005844 Air Filter | $13.53 | Air Filter, 7-1/2 × 13 | Comfort-Aire RG-51J, RADS-51L, RAD-61L |
Where each part wins
- Choose the Display Box Subassy Box when replacing the display box assembly in a compatible Comfort-Aire REG-series unit. Its model list includes REG-123L, REG-123M, REG-183J-20A, REG-183L, and REG-81L.
- Choose the Air Filter when the needed item is a 7-1/2 × 13 filter for a compatible unit. Its compatibility list reaches beyond Comfort-Aire to named Artic King, Fedders, Hanover, and Midea models as well as several Comfort-Aire RG, RAD, and RADS units.
Product notes
Comfort Aire 17220300A17150 Display Box Subassy Box
This replacement is the clearer match for an air conditioner repair centered on the display box assembly. The description identifies it as a Display Box Subassy Box and associates it with a defined set of Comfort-Aire REG models, including REG-123J, REG-123L, REG-123M, REG-183J, REG-183L, and REG-183M. It is also listed as new. At $42.17, it is the higher-priced choice in this comparison, which makes the specific display-box purpose especially important to the decision. Its limitation is equally straightforward: it is not the filter option and is tied to the REG model group named for this part. Select it for a display-box replacement need rather than routine filter replacement.
Comfort Aire 12120300005844 Air Filter
Pick this part when the replacement need is an air filter in the stated 7-1/2 × 13 size. At $13.53, it is the lower-listed-price option, and its named model coverage includes Comfort-Aire R-51L, RG-51J, RG-51M, RADS-51L, RADS-61H, and RAD-61L. The description also names compatible models from Artic King, Fedders, Hanover, and Midea, making it relevant across several air-conditioner model families. It is listed as new. The tradeoff is its narrow role: this is an air filter, not a display box assembly, so it does not address a repair involving the controls or display-box component. Its size and part function should drive the choice.
Final choice by use case
- For a Comfort-Aire REG-123, REG-183, or REG-81 model needing a display-box assembly: choose the Comfort Aire 17220300A17150 Display Box Subassy Box.
- For a 7-1/2 × 13 filter replacement in named Comfort-Aire RG, RAD, or RADS models: choose the Comfort Aire 12120300005844 Air Filter.
- For a lower listed price among these two parts: the Air Filter is listed at $13.53, while the Display Box Subassy Box is listed at $42.17.
The practical answer is determined by the air conditioner's replacement-part requirement: choose the display box for the display-box assembly role, or choose the air filter for the specified filter role and size.
