Verify the coil option
Ask for the leak location and test result, the installed model numbers, and the proposed coil part number. Have the provider confirm manufacturer-approved compatibility with the outdoor unit, refrigerant, and other installed components.
A physically fitting coil is not necessarily an approved match. Ask whether replacing only the coil would retain proper operation and whether any additional parts or installation work are required.
Do not accept a different refrigerant as a simple top-up or drop-in substitute. EPA explains that alternatives may require changes to system components. Refrigerant work belongs to appropriately certified technicians. EPA repair and conversion guidance.
Compare more than the part price
Request a total repair price including the coil, refrigerant, labor, required related work, and warranty. Ask about availability and the condition of the remaining equipment.
Compare that with an itemized replacement proposal. A cheaper repair may be worthwhile if the system is otherwise sound. An aging system with other significant faults, an unavailable approved coil, or a costly repair can favor replacement.
Neither a low repair price nor a phaseout headline settles the choice. The useful recommendation explains what remains after the repair and why that investment is reasonable for your home.
Your next step is to request written coil compatibility, refrigerant availability, and a full repair-versus-replacement comparison. If the provider relies on a claimed ban without identifying the applicable rule, seek clarification or an independent assessment before deciding.