We live in a 20 year old home built on a slab. About 4 years ago we were hit with about 8 inches of rain in one day. From that point on, we have had a problem with water seeping into the duct work under the slab. We have had carpet cleaning companies come out to try to suck the water out of the ducts and it only fixes the problem temporarily. If it rains enough, all of the heat and A/C is directed to the 2nd floor and no air moves through the vents on the first floor. With the most recent rain we had, the vent in the NW corner of the house remains blocked. How do we fix this? Do we need to have someone come out and jack-hammer up the slab? We don't even know where to start. Help!!

There is no real way to seal the ducts. Most abandon the leaky ducts, perhaps to use them to pull PEX tubing to run baseboard for heat around the perimeter, then seal the ducts to prevent mold and insects.

The heat source would then be a boiler for the downstairs and a hot water coil in the blower for upstairs to keep the air conditioning for upstairs.

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