Comfort First Heating are very responsive, and the gentlemen who came were very helpful. One even gave me his cell phone number so I could call him directly if I had any questions. They've done a couple of things for me. They come twice a year to check on my heating and cooling systems. I actually thought I had a problem so I called, and the guy walked me through what was going on and told me if the problem got worse to call them in. I'd say that they're reliable, I would recommend them to other people.