Is your whole condo built with heated floors? We have a house with a walk out basement. The upstairs is regular forced air, the downstairs is infloor heating. A boiler heats the floor downstairs and we turn it off in summer. Our furnace hardly runs, summer or winter. In summer, dont really need it, unless a summer like last year. In winter, you get the best of both worlds. Warm air rises, heating the upstairs with very little running of the furnace.
There should be a wild loop that runs around the periphery, it usually is on all the time, unless you turn your boiler off of course, but the rest should be on zones and you should be able to turn the zones off.
If the whole thing is infloor heating, you wont want to turn it off permanently in summer. Infloor heating is not automatic like forced air, and once turned off, it will take a day or two for the slab to get reheated again.
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