I had a sense one of our furnaces (newly installed) was not always coming on when needed. I thought it might be the signal from the thermostat. When the technician arrived he cycled through the thermostat for me. The settings appeared correct. He then checked the furnace and found an error code. He corrected the problem and explained it to me. Throughout the visit Rolando Carrera was patient, communicated clearly, technically competent and thorough in his work.
