Fixed height jumping? 2D C#

Hello, I was wondering if anyone new how to keep all the jumps in a 2d game the same height. My character is never grounded and is always in the air and I want to be able to jump as many times as I want, but I need the height of the jumps to all be the same. I am also using the rigid body to move it as I need collisions. Thanks and I hope I make sense

If you just wanted to controll height you can do that with Damping and mass for the rigidbody, and when you add and rigidbody.AddForce(); you can decide on a certain number for velocity