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The evaporator coil is very cold, which causes water to condense on it's surface, like how water condenses on a cold soda can. The water runs to a drain pan at the bottom of the coil and then flows outside your home via a drain pipe. If water is leaking around your furnace, you very likely have a clogged drain pipe or cracked drain pan and should have it fixed immediately.

However, if you have a heat pump and you see water around the outdoor unit during the winter, this is normal.

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Q: Why would an air conditioner leak water?
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What would cause a central air conditioner to make a dripping sound in the inside unit and leak water?

When air is cooled the water in it comes out (like mist forming on the outside of a class filled with cold coke) and this happens in the air conditioner. Normally the dripping water is drained way to the outside (or a drain) by a pipe. If the pipe gets blocked the water will overflow and the conditioner will leak water - get it serviced.


Why would You have water dripping out of out central air unit?

This is water that has condensed out of the room air on the evaporator coils of the air conditioner, and it is completely normal. If the humidity is high, one will see more water condensing and dripping from the air conditioner than when the room air is dry.


What does it mean when the condensation overflow tube for your house air conditioner is not dripping water?

It means that the tube is clogged. You need to clean it out or eventually you will have a leak of the water that is backing up in the system.


Why is your indoor central air conditioner leaking water?

That isn't a leak, it is condensation from warm, moist air hitting the cold air conditioner parts. You can see the same thing under cars in the summer . . . there will be a little wet spot on the ground under the air conditioning compressor, and for the same reason.


What to do if water doesn't leak from air conditioner?

It's either not cooling enough or the drain is clogged. the water that is leaking from your a/c unit is humidity that has condensed on your evap coils. As air is passed thru the evap coils, heat and humidity are removed from said air.