Hello! My furnace is leaking water... I thought it was from the pump box overflowing since there is water near there, but there is also water on top of the furnace where the duct (?) connects to it. I have a gas hot water heater that is one year old... please help!

I once found that the de humidifier attached to my furnace leaked a lot. This could be worth checking out.

Chech the coil for being dirty , coil not level , leaking condensate pan. The evaporator coil sits on top the furnace and is difficult to clean as well as checking it for a rusted out pan or cracks the best way is to disassemble and take it out side and wash it and inspect it at the same time.