Don with BOSS Services shared how to prevent carbon monoxide leaks. You need to get your furnace inspected. BOSS needs to put cameras in there to be able to visually see if there's any issues with their heat exchangers; the heat exchanger is a prime reason why you have carbon monoxide leaks in your home.
So it's very important to make an appointment to get that scheduled to get a professional check into it. If you're in need of these services, you should definitely call BOSS Services and get one of their expert technicians out there to take a look at that. It just gives you a peace of mind that you're not going to have any issues in the future.