We requested quotes from three vendors on Homestars for which 2 called us back. We settled on Trane for a furnace based on product reviews and research which lead us to Button's, and the other vendor. Button's sales person, Pete, was extremely knowledgeable in HVAC having been in the business for many years and having also been an time installer many moons ago. I think he could talk for hours on all aspects of HVAC from the 60's through to today. The other vendor was not nearly as knowledgeable and didn't seem to know Trane all that well.
Button's installers were great. They were always on time and were accurate down to the hour as to when they would be done. They could have easily done the bare minimum but ensured everything was done properly and then went above and beyond by fixing non essential items that were done improperly by the previous installers.
They cleaned up everything afterwards and they even repositioned some of the drop down tiles that were out of place because of what I had done.
They also submitted the OPA forms for us so that all we had to do was enter basic info on the OPA site for which Button's sent us the link.
Their price was inline with the other vendor and cheaper than our incumbent. Not sure what else you could ask for?