Hello Jerome and Welcome to the Forum:
The ceiling radiant heat is typically a thin cable placed between two layers of sheetrock; and yes, repair is virtually impossible. The baseboard heaters are a viable alternative because they feature individual room thermostats--you can turn rooms off that are not occupied.
There are a couple of alternatives that work with electricity. The air to air heat-pump is the easiest to install and the new high efficency models do a bang-up job. The ground source heat pump is the "greenest" and most efficient but would require underground lines burried in the yard. The lines can be either horizontal, in long trenches or they can be vertical, placed in wells 150' deep. Each ton of capacity requires 500' of trench line or 150' of vertical line.
The problem is, in a condo, you normaly don't own the ground outside. Your boundries are usually the paint on the walls and the carpet on the floor. However, you may be able to start a community co-op where everyone goes to a geothermal systme and wells could be drilled all around the condo complex (the holes are spaced 15' apart). That should be plenty to chew on for a while, I wish you success in your quest and please let us know how you work it out.
Glenn
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