I highly recommend Furnace King.
My furnace broke down on the coldest day of the year, in January 2022. I had another company visit and diagnose the issue, but they took days to organize a replacement.
In frustration, I called Furnace King to see if they could help faster. A tech visited me the same day, followed by a Sales Lead - Sandip. Sandip walked me through the options and organized an install for the next day.
The Furnace King team was responsive, professional, and most importantly fast in a tricky situation. Moreover - they were always on time (which is rare these days).
Big thanks to Furnace King.