12/14/2015
Attention customers of the big rental companies:
Almost daily people call me with the same story.
On annual inspection or during service call the technician informs the customer of "high CO readings" or "cracked heat exchanger" and the furnace needs to be turned off If your furnace is less than 20 years old I would strongly recommend a second opinion. many times i have gone in and found no problems. CO readings in the flue gas of a high efficiency furnace may be up to 200PPM which is acceptable, 400PPM is the acceptable rate on a Cat. 1 furnace although it should be cleaned if it is higher than 50PPM. Ask to see results of tests. Most of the modern test equipment we use today has the ability to print results with time and date stamps. Check time and date stamps to make sure it is from your furnace.
Do not give in to high pressure sales tactics.