Best HVAC Installation Or Replacement in Aurora CO

I called and got an estimate on a couple large plumbing jobs. The technician they sent the first time seemed very knowledgeable. However...a couple days later I needed someone to come over asap and change some washing machine valves. I needed the job done asap because of another unrelated home improvement job. A different technician came by the next day and replaced the valves. About an hour after they left I noticed one was leaking, I called and they sent the same guy back over the next day to fix it. He said he fixed it and was about to leave when I noticed it was still dripping! Absolutely terrible quality control and attention to detail. I said im sorry but that is still dripping and will need to be fixed yet again. He then removed all the problematic fittings and replaced them with a different style of valve and soldered it into place. Finally not dripping he left. Needless to say I'm not planning on hiring them for the remaining major plumbing job. It is mind boggling to me that the technician didn't check his work for leaks on either occasion!