[ttodd]

There's been lots of discussions on some other threads about the benefits of dual stage or variable speed HVAC systems and I was pretty sold on this idea. I did just learn that as of Jan 2025, the only option is the Carrier Performance 15 Single Stage system.

This decision appears to be driven by EPA mandate which requires a phase-out of HFC refrigerants (like R-410A) in favor of newer, lower-global-warming-potential (GWP) refrigerants—beginning in 2025.

As of January 1, 2025, manufacturers will no longer be able to produce new HVAC systems that use R-410A. The two most common replacements are expected to be:
* R-32 and
* R-454B

So in anticipation of the potential for supply issues during this transition period, it seems that TV just simply decreed that these variable speed units are just not going to be offered.

However - when Iook at the website for Sunshine AC, these units are absolutely available. It's my understanding that systems with the old R-401A refrigerant can still be installed in 2025 as long as the system was manufactured prior to 2025.

Hopefully the powers that be will soon again allow for more upgraded systems to be become available.