Did they require it to be upgraded to the next generation with the mildly flammable refrigerant or do you have the option of using a 410A system? Did they require the Air handling unit to be replaced too?
If it is 410A you won't have to replace the inside unit which will be much cheaper if you have that option. Also remember 410A will be still available for years to come but it will gradually go up in cost. Only the production of 410A equipment will be halted at the end of this year.
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The new refrigerant mandate officially takes effect on January 1, 2025. From this date forward, new HVAC systems and air conditioning units will no longer be manufactured with R-410A refrigerant. Instead, any new HVAC equipment produced and installed will be required to use a refrigerant with a lower GWP than R-410A, like A2L refrigerants such as R-454B and R-32.
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R-410A Refrigerant Phase Out: Upgrade Your AC Now And Save Big.