We had used Natural Choice in the past for a new central air. This time we needed a new furnace so called Natural Choice. Price was about $1,000 less than the competition. Installation was efficient, timely and thorough.
Installed a new until at my house with no troubles and left the place absolutely clean after.
City Gas has been servicing my furnace for many years (decades?) because their service is always prompt (on time), professional, polite, and priced fairly. I can't imagine anything they could improve - pretty rare in today's world.