I selected Knight for my furnace & AC replacement based on their stellar reviews and I was not disappointed. The sales agent (Brian) came to the house, spent about an hour with me discussing the heating and cooling characteristics of the present system. He then made some very good recommendations and engaged in a very productive dialogue to explain merits & demerits of the various options.
When installation time came, no delays in start date by the way, the install techs (Carson and ??) were very communicative and highly proficient. The finished promptly and cleaned up very well, gave me a brief rundown of the new furnace.
The new Trane 2 stage furnace keeps the house much more comfortable than the prior single stage unit (we were in the middle of a polar vortex when it was installed); I highly recommend 2 stage in this region. AC will be installed in the spring, will try to update this review afterwards.
To summarize, Knight Plumbing, Heating & AC is a first class HVAC installer.