Throughout my home that was purchased a couple yrs ago, are baseboard vents. How do I remove them since I will never use? They seem to be taking up excess space?

Well, removing them involves disconnecting the wires to them and capping the wires and pushing them back into the electrical boxes in the wall.

Then you can undo the mechanical connections (screws, etc.) that hold them to the wall, and remove the baseboard heaters. (Then you will probably have to paint or refinish the wall, to make the part that was underneath the heater match the rest of the wall.)

Finally, you will have to put blank cover plates over the electrical boxes in the wall -- usually these were not installed, since the baseboard heaters covered them. You might want to find the circuit breakers that control these heaters, and turn them off. You might even tape them, so nobody turns them back on. Or even open the breaker box and disconnect the wires to them entirely. This is just an extra precaution, since the wires were disconnected from the heaters.

But I would really wonder why you would want to do such a thing as this. All the baseboard heaters I've seen are less than 2" thick, and about 6" high. I can't think of much use for a 2" by 6" space at baseboard height along a wall -- what valuable use do you plan for that area?

I'd much prefer to leave them there as "emergency" heaters. But then, here in Minnesota winters, we tend to be very concerned about heating.