What does it mean when the condensation overflow tube for my house air conditioner is dripping lots of water?

It most likely means that the unit is working as it should.

Some explanation is in order...

First the air conditioner in your home is designed to cool the air. When air cools, any moisture that is in the air gets squeezed out. This is called condensation.

Most air conditioners have a condensate pan buildt into the unit, and a line coming out of the pan through which the condensate can and will flow under normal conditions.

Most units also have a secondary drain line. if water is comming out of this line then the firs is possibly obstructed.

Hope this helps

Terry

Good explanation but if I'm understanding the definition of overflow tube it means you have problems. In my house, one of our A/C units is in the attic and has 2 drains. It has 1)a primary that drains to the house sewer system and 2)a catch pan under the unit that drains to a pipe and empties outside under the eaves. This is the overflow. If you see water dripping from a pipe outside, it means your primary is clogged and it should be fixed SOON. If the overflow also clogs, you'll have water damage to walls, ceiling, floors etc. We live in Texas and our air conditioner will remove gallons water from the air in a normal day. Imagine if it has nowhere to go.

Riley