I shopped around for a new high efficiency furnace / air conditioner. Cozy Comfort was not the cheapest, but the salesman convinced me that by going with Cozy I would get the best install job possible. That's where things went off the rails and the salesperson seemingly had no further involvement outside of making that sale (his crew didn't even know who he was - and had no information I have the salesperson of the specific items I wanted taken care of when they arrived). I received an "ok" install, but had to more or less sit there the entire time to make sure the crew was doing things properly (for example, they did not have proper items it hook-up the condensate line and asked me to run to Canadian-Tire to grab some items?). The install was not as per the manual and caused problems (which I will get into later). The salesman promised a communicating setup which was not completed (they set it up as a standard A/C unit). The communicating thermostat was not setup properly (setup as a two-stage furnace when I paid extra for the top-of-the-line modulating version with communicating thermostat). I had to correct all these errors myself by reading the manual and changing the settings. That's not what I paid for, I paid for it to be setup properly. If I wanted a two-stage furnace I would have paid less and purchased that.
Outside of the crew having no idea to configure the furnace / A/C properly, the install was "OK". Ductwork fabrication was fine, but it was not taped to seal holes and so forth.
After a few days, the furnace stared throwing all kinds of pressure switch errors. Long story short, Cozy could not diagnose it. After getting fed up with their useless techs coming over and wasting our time saying "looks good, try it for another week" - all the while the furnace inducer being full of water (confirmed by a tech who said this was a huge problem), I finally grabbed the installation manual and started reading. Low and behold, the condensate drain was improperly installed. I corrected it and the furnace hasn't thrown an error code since.
Finally, I had the yearly "maintenance" completed to keep my warranty intact. What a rip-off that $150 was. It involved a tech coming out, looking at the furnace, turning it on, and saying "yup - everything works fine". Not only that, he unscrewed the blower door compartment and when we left didn't even put all the screws back in (they were laying on the floor by the drain). My understanding was that this service was to clean the furnace. There was visible debris (which could be seen through the burnerbox peephole) that was there either from the install or was sucked in through the intake vent. Either way, it wasn't cleaned out. I had to do it myself (remove 1 screw and vacuum out, took about 1 minute).
I can't recommend these guys. They don't take the proper time to figure out what they are installing and definitely don't take the time to maintain the units properly. After seeing what the tech did during the yearly maintenance, that's the last time I will be wasting $150 for visual checks which I can do myself.