
Refrigerant R-438A, commonly known as MO99, is a non-ozone-depleting hydrofluorocarbon (HFC) refrigerant developed as a reliable replacement for R-22 in refrigeration and air conditioning systems.
R-438A is particularly well-suited for retrofitting existing HCFC systems that utilize direct expansion (DX) evaporators and positive displacement compressors. It enables system owners to transition away from R-22 with minimal equipment changes while maintaining dependable cooling performance.
When you purchase from HVACFrigo, you receive brand new, 100% virgin refrigerants. Every product meets or exceeds ARI-700 purity standards, ensuring consistent quality, system safety, and reliable long-term performance.
Direct partnerships with Chemours, Honeywell, Arkema, and others. No middlemen. No uncertainty.
Free US shipping on every order — no minimum. Same-day processing keeps your jobs moving.
Send empties back. Receive credit.
No, You don't need EPA certification to buy refrigerants from us.
Yes. HVACFrigo offers free US shipping on every order to the contiguous United States — with no minimum purchase required. Whether you need one cylinder or a pallet, standard ground shipping is on us. The only additional charge is the mandatory $25 hazmat fee for orders containing refrigerants, which is required by carriers for handling hazardous materials.
We carry a full range of refrigerants for residential, commercial, automotive, and industrial applications, including:
| Category | Examples |
|---|---|
| High-Pressure | R-410A, R-32, R-454B |
| Medium & Low Pressure | R-134A, R-404A, R-507 |
| Retrofit & Drop-Ins | R-438A (MO99), R-421A, R-407C |
| Low-GWP Alternatives | R-448A, R-449A, R-513A |
If you don't see what you need, contact us — we can source specialty gases upon request.
Because refrigerants are regulated hazardous materials, opened or used cylinders cannot be returned. However, we accept returns under the following conditions:
| Condition | Timeframe | Restocking Fee |
|---|---|---|
| Unopened, unused, resalable condition | Within 14 days | 20% |
| Damaged upon arrival | Within 7 days | None |
| Incorrect item shipped | Within 7 days | None |
