According to Chris Lewis :
Now I doubt this 1953 house has AC with the quality control of HFAC,
but just making a point that AC is good, damn good when properly used,
and installed.

I suspect there's rather more to HVAC than simply a "well Q/A'd AC".

phoo! HFAC. I couldn't find any specs for it online.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.