Absolutely the best. They send highly qualified individuals to help you. Rick and Chuck recently helped me out and they were wonderful. They called to let me know they were on their way eliminating the need to sit and wait for hours. And they diagnosed and performed the work beautifully. When our air conditioning went out and it was 115 degrees they came immediately and took care of the problem for $300 where I had been quoted $1800. We have used Sterling for plumbing needs but have now used them for our air conditioning needs as well. I high recommend Sterling.