Quick Take
When you're replacing a commercial or residential refrigeration compressor, the first decision is refrigerant: R134a, R404a/R507, or R290. Then you match back pressure (LBP, MBP, or HBP), voltage, and horsepower. These four hvac refrigeration compressors are split between R134a and alternative refrigerants, with capacities from a 1/4 HP dual-duty unit to a 1/2 HP medium-back-pressure R290 model. One is listed as an open-box item, so condition is part of the comparison.
Listed Price Comparison
Listed prices for the four compressors run from $112.66 to $273.28.
| Product | Listed price | Price bar |
|---|---|---|
| Secop NF5.5CLX (R404a/R507) | $112.66 | |
| Secop NF8.4FX2 (R134a) | $177.23 | |
| Sikelan GQR12TD (R134a) | $209.99 | |
| Secop NLE11MN (R290) | $273.28 |
Decision Matrix
| Product | Refrigerant | Capacity / Frame | Best match |
|---|---|---|---|
| Secop NF8.4FX2 | R134a | 1032 BTU LBP / 3767 BTU HBP, 115V 1/4 HP | Low-temp freezer or medium-temp cabinet replacements |
| Secop NF5.5CLX | R404a / R507 | 1/3 HP, 115V, LBP/MBP | R404a/R507 appliance or food service swaps |
| Secop NLE11MN | R290 | 4167 BTU MBP, 115V 60Hz 1/2 HP | Commercial medium-back-pressure runs |
| Sikelan GQR12TD | R134a | 4521 BTU HBP, 110-120V 1/3 HP | Ice cream machines and commercial high-back-pressure use |
Product Notes
Secop NF8.4FX2
The Secop NF8.4FX2 is a 115V 1/4 HP R134a compressor that lists both low- and high-back-pressure ratings: 1032 BTU at LBP and 3767 BTU at HBP. That split-duty range is the main reason to choose it if your system might run at either back pressure. The listing also identifies replacement targets including Danfoss, Embraco, NE2121Z, FF10HBX, and ARE37C3E-IAA, which makes it easier to match an older unit. The limitation is the 1/4 HP frame: in this group, the 1/3 HP models and the 1/2 HP R290 unit are built for heavier loads, so the NF8.4FX2 is a better fit for lighter refrigeration duty.
Secop NF5.5CLX
Choose the Secop NF5.5CLX when you need an R404a or R507 compressor: it's the only model in this comparison using those refrigerants. It runs on 115V at 1/3 HP and is described as suitable for low and medium back pressure, with replacement applications covering Whirlpool, GE, and Electrolux appliances as well as food service equipment and bottle coolers. The condition is listed as New - Open box, which is a different buying situation than the other units. The trade-off is that you're getting an open-box item rather than a sealed new compressor, so the condition is the main thing to weigh against the price.
Secop NLE11MN
The Secop NLE11MN is the highest-capacity option here, with 4167 BTU at medium back pressure using R290 propane as the refrigerant. It's a 115V 60Hz 1/2 HP compressor and the listing calls out replacements for True 219179, 967265, and Delfield 8050688, which points to commercial refrigeration cases. The upside is the large MBP capacity in a 7.99-inch-tall package, built for systems that need the lower-GWP R290 route. The limitation is that you must be committed to R290 as the refrigerant; the other compressors here use R134a or R404a/R507, so it won't swap directly into one of those systems.
Sikelan GQR12TD
The Sikelan GQR12TD brings R134a power to the high-back-pressure side, listed at 4521 BTU with a 110-120V 1/3 HP frame. It's aimed at commercial replacements like ice cream machines and other medium/high-back-pressure units, and it names Tecumseh models such as AE4450Y-AA1A, RGA5454YXA, and HGA9430YXA as direct replacements. The package includes overload protection, starter, capacitor, grounding screw, plastic cap, and rubber feet, which is useful when you want the electricals in the box. The limitation is the higher back-pressure focus: it's not the model to pick if you're working with low back pressure, where the Secop NF8.4FX2 would be the better R134a fit.
Final Recommendation by Use Case
Lowest listed price for R404a/R507 work: Go with the Secop NF5.5CLX at $112.66. It's an open-box 1/3 HP compressor, so the price is the entry point for this set if you're okay with the open-box condition and need R404a/R507 compatibility.
Broadest R134a coverage: The Secop NF8.4FX2 at $177.23 covers both LBP (1032 BTU) and HBP (3767 BTU) in one 115V 1/4 HP unit. It's a good middle-priced pick for dual-duty R134a replacements.
High-BTU commercial R134a: The Sikelan GQR12TD at $209.99 gives you 4521 BTU at HBP with a 110-120V 1/3 HP frame and includes the electricals. It's aimed at ice cream machines and similar commercial medium/high-back-pressure jobs.
Highest capacity and R290 natural refrigerant: The Secop NLE11MN at $273.28 is the most expensive but also the biggest, delivering 4167 BTU at MBP on 115V 60Hz with a 1/2 HP motor and R290.
