heat exchanger crack 是要red tag的。会有CO进入生活空间,有生命安全隐患。家里装有CO detector吗?
I have my furnace checked every year too. Just found a crack in the Heat exchange a week ago, red tag too. My furnace is 11 years old. I think I can still use it for another 10 years so I paid over $1,000 to fix it. If I didn't have the maintenance, I would not know it had problem as the furnace was running as usual.
炉子一般寿命是20--25年。不介意的话,我想问一下,你是如何发现有裂纹的?