That is a heat recovery system. They do save energy cost's when they're working correctly.
If you do live in Florida all your water lines run under the slab.
I'm gonna have it bypassed and disconnect. The line to this runs underneath the house and if that were ever to leak it would be a big problem. Just like the AC line, it use to run underneath the house and when it started to leak I had to have it bypassed through the outside of the house up to the attic.
I hit the like button by mistake. Your heat pump unit is only a 10 seer (efficient rating) - the evaporator coil rating may be less. You should have an HVAC guy out to see is the heat recovery unit is working before disconnecting. I agree with John, if the unit is working it will help on energy cost.
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