SEER, BTU, and Tonnage: An AC Buyer's Guide

https://wiki-book.win/index.php/Repair_vs._Replace:_When_to_Stop_Fixing_an_Old_AC

If you've started shopping for a new air conditioner, you've encountered a set of technical terms that can make the process feel more complicated than it needs to be. SEER2. BTU/h. Tonnage. HSPF2