krw wrote:
says...

Any energy you put into latent heat will come back later.

Latent heat, as in evaporation?

With out without a phase change (though there wouldn't be one in a
hydronic system)...

Latent heat requires a phase change.

As long as you don't get condensation mold shouldn't be an issue.

To avoid mold, keep the RH below 60%.

You have to avoid anything in the room below the dew point too.
Windows and frames often "sweat".

At 100 vs 60% RH.

Nick