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

https://seoneo3.blob.core.windows.net/mass-hvac/uncategorized/why-old-new-england-homes-are-tricky-to-cool.html

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