I called Evergreen for a second opinion on my furnace. Another company had shut my furnace down claiming there were cracks in the heat exchanger. The serivice technician (Rob) took a lot of time in an attempt to find the cracks. He had a hand held video camera that could examine the inside of the exchangers and show me via LCD display. He could not find the cracks the other guy stated were there. He then did a carbon monoxide test and found none. Rob put my furnace back together and gave me his honest opionion that the furnace was safe. He charged me a reasonable price for great service. It took him about thirty minutes to put the furnace back together after the other company had totally disabled my furnace by cutting wires and attempting to ruin my furnace. I would recommend Evergreen to everybody when a second opionion is necessary or when needing any type of service at all