Your chimney damper is open
You close the damper when you are not using the fireplace too keep air from coming in and to keep the air from being sucked out. This is most important in the winter. You don't want cold air coming in and your heat sucked out. When you are using the fireplace you have to open the damper to allow the smoke and fumes to escape.
Yes. The wind can suck more heat up the chimney and suck more cold air into the house. I bet you didn't realized that a fireplace in cold weather has to draw cold air from the outside by some means into the house to feed the fireplace updraft. Go figger!
It's somewhat cold. It's just very little cold air coming out. Can't hear the vent blow the air as well.
If there is no cold air coming from the air conditioner on a Honda Odyssey the condenserÊmay have failed. No cold air coming from the air conditioner can also mean that the unit needs to be recharged.
pluged filter, dirty coils,
because all of the gravity is coming up from the ground where air circulates through it
The simple solution is to set your heater to recirculate so no new fresh air comes in. If it is coming in through the doors and such you may need to replace the seals.
A cold air intake regulates the amount of cold air coming into a car and ensures the air is properly filtered.
it means that there are a high pressure system coming in through the air from the weathers butt
Yes, cold air does have a higher density than warm air. For example, if you turn on the fireplace, all of the warm air rises to the ceiling. On the floor, the air is cooler.
Is there a flame in the furnace. Precisely where is this air coming from and how strong is it?
I would think both. Cold air from the room goes in the bottom and warmer air comes out the top.