I live in a townhome built in 2000. Our furnace is working fine but next to it is a duct blowing in freezing?

The duct is most likely for combustion air. When homes started being built very tightly there became the need to supply combustion air to the furnace to replace the air going up the flue. If you plug it your furnace may starve for air and run too rich or go out all together.

Ductwork in most homes consists of warm air (warm air traveling away from the furnace) and cold air (cool air returning to the furnace from various parts of the house) to be reheated. "Freezing" air should not even be available to the duct system. I think the best thing to do would be to call a heating and air conditioning company and ask about it. They may be able to answer your question without a service call. If it does require a service call, it will probably be cheaper than heating all that "freezing" air.

You need to call an HVAC Contractor. You're basement being really cold is a clear indicator that there is an issue with the duct.

on condition which you think of you are able to play alongside wisely. If that appeared a threat, then i'd attempt a head-pretend: "pay attention that? -- that's the hearth alarm, the hearth branch is on their way. specific, i'm particularly specific." and so on. Failing that, you have have been given to distract the guy merely long sufficient so which you are able to destroy out and get in touch with the paramedics. frequently speaking, nonetheless, because of fact which you have a perfect to no longer be harmed and an criminal accountability to grant your self with protection, that's suitable to stay out of somebody else's fantasy.

you should the repair people in your area;it sounds like a duct has fell off .