Furnace stopped working at start of heating season (end of Oct). Nova Heating was able to get to our house and repair same day. My mother-in-law was at the house and commented how friendly repair person was.
I have used them in the past over the last 15 years, with equally positive experiences, for example:
1) they told me how to repair my furnace on my own (replace heat sensor .. pre all the you-tube DIY vids)
2) Came to site and diagnosed hot water tank, and provided tips for DIY furnace and hot water tank operation + maintenance, but then charged nothing and referred job to another company who was more familiar with the brand of hot water tank installed in our house.
Other experiences with other larger firms was much more negative:
1) technician never showing up to site to perform quoted work (over numerous rescheduling efforts) and
2) Replaced water heater company charging for permit that was never taken out (until a week later when I questioned them for a copy of the permit). (red van firm)