Replacing an air-comfort component can mean choosing a complete air handler, a small filter, or a display assembly-and those are fundamentally different purchases. The useful decision is to start with the job at hand: whole-unit single-zone equipment, a filter identified by part number, a filter with a stated size, or a display box subassembly.
Quick take
The Comfort-Aire Hyper Heat Air Handler is the clear whole-unit option, while the other three choices are individual air-conditioner parts. Between the two filters, the part numbers are different, and the Comfort Aire Air Conditioner Part # 12120300005844 - Air Filter also states a 7-1/2 by 13-inch size. The Comfort Aire Air Conditioner Part # 17220300A17150 - Display Box Subassy Box serves a separate display-component role rather than a filtration role.
Listed-price comparison
| Listed option | Listed price | Relative bar |
|---|---|---|
| Comfort-Aire Hyper Heat Air Handler | USD 800.00 | |
| Comfort Aire Air Conditioner Part # 12100204000202 - Filter | USD 12.61 | |
| Comfort Aire Air Conditioner Part # 12120300005844 - Air Filter | USD 13.53 | |
| Comfort Aire Air Conditioner Part # 17220300A17150 - Display Box Subassy Box | USD 42.17 |
The range runs from the small filter part at USD 12.61 to the air handler at USD 800.00. That spread reflects the difference between replacement components and a complete air-handling unit, rather than four interchangeable ways to address the same task.
Decision matrix
- Need a single-zone air handler: Focus on the Comfort-Aire Hyper Heat Air Handler, with its one scroll compressor, one fan motor, 21-inch stated width, and 208/230V corded-electric configuration.
- Need filter part number 12100204000202: The Comfort Aire Air Conditioner Part # 12100204000202 - Filter is the direct title match and includes MDA12100204000202, 12100204000202, and CMF12100204000202 among its references.
- Need a 7-1/2 by 13-inch air filter: The Comfort Aire Air Conditioner Part # 12120300005844 - Air Filter is the relevant choice, carrying its own distinct MPN references.
- Need a display box subassembly: Choose the Comfort Aire Air Conditioner Part # 17220300A17150 - Display Box Subassy Box, which is named for that component category and references 17220300A01677 and CMF17220300A01677.
Product notes
Comfort-Aire Hyper Heat Air Handler
The Comfort-Aire Hyper Heat Air Handler suits an air-comfort project centered on a complete unit rather than a small replacement part. Its listed configuration is gray and single-zone, with one scroll compressor, one fan motor, a 21-inch width, corded-electric power, 208/230V operation, and a 24-hour timer. Those details make it the relevant selection when the need is an air handler with a compact stated width and a single-zone setup. At USD 800.00, it occupies a distinctly different purchase scope from the three service parts. Its limitation is equally clear from the title: an air handler does not address a filter replacement or a display-box subassembly task.
Comfort Aire Air Conditioner Part # 12100204000202 - Filter
The Comfort Aire Air Conditioner Part # 12100204000202 - Filter is the most direct choice when part number 12100204000202 is the target. The filter title is supported by reference numbers including MDA12100204000202 and CMF12100204000202, and the description names models such as Comfort-Aire REG-123J, REG-123H, REG-123M, REG-81J, and REG-81M. Its USD 12.61 listed price places it at the low end of this group. The tradeoff is specialization: this is a filter component identified by its own part-number family, not the 7-1/2 by 13-inch filter or the display box subassembly.
Comfort Aire Air Conditioner Part # 12120300005844 - Air Filter
The Comfort Aire Air Conditioner Part # 12120300005844 - Air Filter is the filter to prioritize when the stated 7-1/2 by 13-inch measurement matches the component being replaced. Its reference set includes MDA12100204000700, MDA201121190007, 201121190007, and CRC201121190007, while the description names Comfort-Aire models including R-51L, RG-51J, RG-51M, RADS-51L, and RADS-61H. The USD 13.53 listed price is close to the other filter's price. The limitation is its distinct identity: its size and part-number family set it apart from the filter numbered 12100204000202, despite both being labeled for air conditioners.
Comfort Aire Air Conditioner Part # 17220300A17150 - Display Box Subassy Box
The Comfort Aire Air Conditioner Part # 17220300A17150 - Display Box Subassy Box fits a display-component need rather than an airflow-filter need. Its identifying references include CMF17220300A01677, 17220300A01677, and CMF203321990255, and its description associates the assembly with Comfort-Aire REG-123L, REG-123M, REG-183J-20A, REG-81M, and REG-81L models. At USD 42.17, it sits between the filter parts and the full air handler in listed price. The key limitation is function: the display-box title describes a control/display assembly, so it is not the option for a replacement filter or a single-zone air-handler project.
Final recommendation by use case
For a complete single-zone setup with the stated 21-inch width and scroll compressor, make the Comfort-Aire Hyper Heat Air Handler the leading choice. For a filter replacement centered on part number 12100204000202, choose the corresponding Comfort Aire Filter. For the stated 7-1/2 by 13-inch filter format and its separate part-number group, select the 12120300005844 Air Filter. When the task is a display-component replacement, the 17220300A17150 Display Box Subassy Box is the purpose-matched option.
