House is one story on a slab. The air handler sits on a platform in the laundry room. The lineset and condensate drain go down through a PVC chase under the floor, across the width of the house, exiting on the side where the condenser is. The old 3.5t Rheem condenser is outside a b/r window and "shares" a concrete slab with the irrigation system pump. Physical size of the condenser is such that it's half on, half off the concrete and the "half-off" side where the compressor sits has completely rusted through. Various contractors have quoted replacement equipment and each has their own solution to "correct" the stationing of the outside unit. Here are the three options I've been given.
1) Most contractors said not to worry, they'd put the condenser in the same place on top of a pad that would be half-on and half-off the existing concrete.... no problem! Most would pull a new lineset and drain through the existing chase, one would pull a new lineset through but re-use the drain, one would simply flush the existing lineset and drain and re-use both.
2) Two would definitely move the condenser further to the rear of the house, past the 12'x12' atrium which has floor drains to the outside, where it would not be near a window and could sit firmly on a new pad on the ground. Their solution for the lineset and drain would be to flush and re-use the existing drain and run the lineset up through the attic, across and then down through the soffit to the outside, then down the side of the house, covered with a gutter-like chase.
3) One would move the condenser to the location described above, past the atrium, but would pull the new lineset through the existing chase under the house and then "bury" it and run it underground along the house to the new location.
I don't like option #1 and have ruled it out. Here in Florida anything sitting outside that's not on a concrete slab sinks into the ground when it rains. I don't think a heavy condenser sitting on a pad that's half-on, half-off concrete would remain level beyond a couple of years.
Option #2 sounds reasonable. Several neighbors have linesets behind a chase running down the wall from the soffit, apparently due to replacement installs.
It's option #3 that troubles me. Asthetically, it sounds good, but I'm worried that buried copper lines would corrode and leak after a couple of years.
Any comments on burying the lineset?