Return air vents.........
Cose the high vents in the winter and low in the summer..
Cold air return vents are the ones on the wall
You will need to cut into the brickwork and install them to comply with local building regulations.
Not really, there's not much airflow when the furnace is not running.
Yes vents can be in the floor instead of the wall.
No. Doors will suffice.
In my opinion where the supply vents are located is not as important as where the return air vents are located. the supply vents should be located towards the outer walls if possible. the return air vents should be located towards the center of the dwelling if possible. every effort should be made to get the return air vents as high as possible on the wall , if not in the ceiling.Remember you are trying to get the warm air back to the a-coil so it can be pumped outside through the refrigeration lines to the condensing unit. if the ductwork is used for heating also you should put some return air vents down low to get the cool air to the furnace. This is my personal opinion and may not be everyones.
Air vents are placed based on the required cfm load calculation per room not necessarily set at specific square feet apart. But you need to make sure that supply and return air are not close to each other. Supply air vents should be placed close to outside walls and return air close to interior central walls.
because vents bring in things you need like air and bring out things you don't really need like water.
you may need to check your vents and see if they need cleaned or... you may need a new filter. you may need to check your vents and see if they need cleaned or... you may need a new filter. you may need to check your vents and see if they need cleaned or... you may need a new filter. COZ IT MIGHT BE AN AIR-CON!
Most certainly