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Site title: Heater Repair, Heater Replacement, Plumbing & Electrical | Oliver
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Reviewed by a NATE-certified technician Updated October 2026 11 min read
The short answer
R-410A was the standard refrigerant in home air conditioners and heat pumps from about 2010 through 2024. Since 2025, new systems use R-454B or R-32, which cut global warming poten...
Reviewed by a NATE-certified technician 14 min read
The short answer
Repair your HVAC system if it is less than about halfway through its expected life, the problem is a single part, and it is not a safety issue. Replace it if the furnace has a cracked heat exchanger, if a major pa...
Reviewed by a NATE-certified technician Updated October 2026 11 min read
The short answer
SEER2 is the efficiency rating for central air conditioners and heat pumps made since January 1, 2023. Like the old SEER rating, it measures cooling delivered per watt-hour of electricity over a season, bu...