Bryant Heating & Cooling review: Missed detecting carbon monoxide

had a young tech come out to tell us our heat exchanger was cracked. okay we asked how much for a new furnace? replied 4 or 5,000. Never attempted to tell us about or give information about a new furnace. Shame on them. Called another HVAC/Heating company. This tech also stated heat exchanger was cracked. He also used a carbon dioxide monitor showing furnace spewing carbon monoxide levels. He then contacted his company who put in a new furnace. Imagine if we had not done anything, we could have died in our sleep.