The A2L refrigerant transition, sourced
HVAC systems are switching from R-410A to new A2L refrigerants (R-454B or R-32). This site answers the compatibility and code questions that come up during a replacement — every number here is tagged with where it came from, so you can check it yourself instead of taking our word for it.
I got a quote and something on it doesn't add up
Saw "R-454B" or "leak detection system" on a replacement quote and want a second opinion before you sign? Tell us what it says.
Get your quote reviewed →I need to look up a spec
AHRI-certified indoor/outdoor equipment pairings, by manufacturer and model — a structured lookup table, not a blog post.
Look up equipment →How this site works: every fact carries a source link, a retrieval date, and a confidence level — "verified" or "unconfirmed." We never guess a spec value or infer one from general knowledge. If something isn't traceable to a real source we checked, it doesn't go on the site.