When I called I spoke with Jackie who was very polite and quick to get me in the schedule for service on my AC unit. Within a half hour she called back to confirm the technician Jim was in route. Jim found the condensate line clogged and a leak in the coil and said it looked like something was eating the copper of the coil, but typically something like that would only happen around sewage/sewage treatment areas. I was surprised by his intuition! A drain in the basement, right next to the furnace, has been backing up lately and releasing sewage gas into the basement. I had been putting off dealing with it since I thought it was a small problem. He recommended I fix it right away. He showed me where the filters went and measured the fit for me, which I greatly appreciated. Jim also signed me up for the semi-annual service agreement maintenance program and gave me several tips about oil furnaces. We have been told before that the furnace doesn’t have much time left, which Jim confirmed.