Replacing an air-conditioner component can look simple until several parts share a brand name but perform entirely different jobs. The key air comfort decision here is not merely choosing the lowest listed price: it is separating an exhaust-duct connector from a filter and from a display box, then narrowing the match by part number, dimensions, and the model names associated with each part.
Quick take
The four Comfort Aire parts divide into three clear repair categories. The Comfort Aire Air Conditioner Part # 12120600003049 - Connector, Air Exhaust Duct is the focused choice for an air-exhaust connection and is described as a round Midea Unit Adaptor. Two choices address filters, but they should not be treated as interchangeable: Part # 12100204000202 - Filter has its own compatibility list, while Part # 12120300005844 - Air Filter is specifically described as 7-1/2 inches by 13 inches. The Comfort Aire Air Conditioner Part # 17220300A17150 - Display Box Subassy Box is for the display-box role and carries the highest listed price.
All four are listed as new Comfort Aire parts. The listed-price spread from the connector to the display box is $33.24, reflecting the very different component roles rather than a like-for-like filter comparison.
Listed price comparison
| Part | Listed price | Price position |
|---|---|---|
| Comfort Aire Air Conditioner Part # 12120600003049 - Connector, Air Exhaust Duct | USD 8.93 | |
| 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 |
Decision matrix
- Replacing an exhaust hose connection: Focus on Part # 12120600003049, the connector identified for the air exhaust duct and described as a round Midea Unit Adaptor.
- Replacing a filter for named REG, Keystone, or Artic King models: Part # 12100204000202 is the filter choice whose fit list includes Comfort-Aire REG-123 and REG-81 variants, among others.
- Replacing a 7-1/2-inch by 13-inch filter: Part # 12120300005844 is the direct match because that measurement is stated in its description; its model list includes several Comfort-Aire R, RG, and RADS models.
- Replacing a display-box assembly: Part # 17220300A17150 is the relevant selection, with named Comfort-Aire REG-81, REG-123, and REG-183 model variants.
Product notes
Comfort Aire Connector, Air Exhaust Duct (#12120600003049)
Choose the Comfort Aire Air Conditioner Part # 12120600003049 - Connector, Air Exhaust Duct when the repair calls for the connection between the unit and its air exhaust duct. Its description identifies it as a round Midea Unit Adaptor, and the named fit list includes Comfort-Aire PS-121 and PSH-141 variants as well as several Midea, Toshiba, Danby, and Pelonis models. At USD 8.93, it is the lowest-priced part in this group. Its limitation is inherent to its role: it is a duct connector, not a replacement filter or a display-box assembly. The part number is the useful anchor for shoppers replacing the specific connector named in the title.
Comfort Aire Filter (#12100204000202)
The Comfort Aire Air Conditioner Part # 12100204000202 - Filter fits a filter-replacement need rather than an exhaust connection or control-panel repair. The description names Comfort-Aire REG-123J, REG-123H, REG-123M, REG-81J, and REG-81M, alongside several Artic King, Keystone, and Midea models. Its USD 12.61 listed price places it between the duct connector and the explicitly dimensioned air filter. Select it when the filter part number and the named model family align with the unit being repaired. The constraint is that its title identifies a filter only; it is not presented as the 7-1/2-inch by 13-inch air filter described under Part # 12120300005844.
Comfort Aire Air Filter (#12120300005844)
Pick the Comfort Aire Air Conditioner Part # 12120300005844 - Air Filter when 7-1/2 inches by 13 inches is the required filter size. That stated measurement is its clearest distinguishing detail, while its model references include Comfort-Aire R-51L, RG-51, RAD-61, and RADS model variations. The USD 13.53 listed price is slightly above the other filter listed here, but the sizing language gives it a more specific replacement role. The practical limitation is also its strength: this is a dimension-specific air filter, so it is aimed at repairs requiring the stated 7-1/2-inch by 13-inch format rather than a generic duct or display-box part.
Comfort Aire Display Box Subassy Box (#17220300A17150)
The Comfort Aire Air Conditioner Part # 17220300A17150 - Display Box Subassy Box is the clear choice for a display-box assembly replacement. Its description connects it to Comfort-Aire REG-123L, REG-123M, REG-183J-20A, REG-81M, REG-81L, REG-183L, and related REG models. It also references 17220300A01677 and CMF17220300A01677 as prior identifiers. At USD 42.17, it is the highest-priced entry in the comparison. That higher placement is the main tradeoff, and its specialized display-box designation means it does not substitute for either filter or the air-exhaust duct connector.
Final recommendation by repair need
For the lowest-priced, component-specific duct connection, choose Part # 12120600003049. For a filter tied to the REG-123 and REG-81 families named in its description, choose Part # 12100204000202. When the replacement requirement is explicitly 7-1/2 inches by 13 inches, choose Part # 12120300005844. Reserve Part # 17220300A17150 for the display-box assembly role and its named REG model group.
