My Diamond 80 York central heat and air unit is leaking water under the carpet of the room where the unit is housed. It has saturated the carper in the front of the door to this room. Had repair person come out and he first told me it was the coil and that it was around $700 to replace a coil. Then after looking further he said it was the drip pan and that he could probable get it rebuilt for around $400. My question is this amount too much and can that be done. The unit is 10 yrs old.

did he check the drain? could it be stopped up and the water is just overflowing

Not sure. At fist he talked about cleaning out some pipes or lines. He said the water was leaking underneath the pan where it met with another part. Now sure what it was. Showed it to me and I saw the water. I also stood in front of the unit and looked to the far back of the unit, I could also see where the water leaked down the back of the wall where the unit is housed.

Assuming that the coil pan is leaking, if it is only 10 years old a replacement should still be available. Something sounds a li'l fishy about a "rebuild" for $400.

Thank you.

My gut tells me you need to have the problem looked at a little closer. Take a look for yourself and see how it is draining. Be sure the condensate is dripping into the pan and then to the trap into a condensate pump (if you have one), and then down the drain. Its not rocket science, just follow the water.