What is the odor coming from the boiler?

My spouse walked into the loft yupterday and started sniffing.

I thought he was odoring our breakfast, which was just about done.

I waited for him to tell me how good it odored, but instead, he wrinkled his nose. He asked what the odor was that was coming from the boiler? I didn’t odor anything, but I had been in the loft all day. He said he remembered the odor as a kid and said it odored like the stink bug his mom had killed one day. The odor was in the loft for days. I knew all about stink bugs and how they would make their way into HVAC duct through small holes and cracks. The heat from the boiler would kill them and they would end up stinking up the entire house. He called the Heating, Ventilation, and A/C and made an appointment to get professional HVAC duct cleaners to the house. He wanted the HVAC duct cleaned and sanitized. He then called an exterminator. He told them he suspected an infestation of stink bugs and needed them out of the HVAC duct so it could be cleaned and sanitized. Not only did he remove multiple hundreds of stink bugs, but he eliminated thousand of stink bug eggs. He could not believe they had spread so far, and they had survived so well inside the HVAC duct. He said my buddy and I were lucky they stayed in the HVAC duct and not gotten in the house. I was now itching and asked him to check the loft to make sure they were only in the HVAC duct. He laughed and said my spouse had already asked him to do it.

air vent