Residential air conditioners – split units, window ACs, inverter ACs. 2. Commercial air conditioners – small to medium office and shop ACs. 3. Heat pumps – for both heating and cooling. 4. VRF / VRV systems – larger multi-zone HVAC systems. 5. Chillers – for cooling water or industrial applications. 6. Any modern system designed specifically for high-pressure refrigerants (older R‑22 systems cannot use R‑410A).