Next year will be very interesting.
It has been finalized that there will be no sell through on R410A equipment starting January 1st, 2025.
There is a loophole if you aren't replacing the entire system and replacing one piece of a split system for a repair vs a replacement, but that could be even a bigger quagmire to navigate vs the inspections department.
R454 (most major brands) will be used, with Daiken using R32, Trane is going to be using something else (escapes me now) that is basically R454B but with their name on it or something like that.
Reality is manufacturers will have to plan on a conversion prior to 2025, which means next year. NO ONE will want to be stuck with inventory that they can't sell at the end of 2024.
When it you think about it, this is like the auto industry having 95% of their vehicles gas or diesel, and the government telling them that they have to go 100% electric 14 months and any gas or diesel vehnicle would be illegal to sell after that date.
R22 equipment had a sell through, as well as all the efficeny changes, but not this time.