At the moment the PC is open and there is some warm up of the air in the pc. This is due mainly to no fans to move the air around, so it stagnates in areas. Natural convection will avoid this getting excessive, but convection requires a differential to work.
With artificial convection currents caused by the chimney effect this slow warm up probably wouldn't occur.
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(GR)Well, cooling without condensation will RAISE the RH, and bring the dewpoint closer to the temperature of the cooled air. Cooling with condensation will lower the amount of water vapour in the cooled air, but that air will still have a high RH (because of it's low temperature) as long as it isn't warmed back up.
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Sounds good but I really don't think atmospherics are that simple. If that were the case the only way the air could release moisture when it was cooled would be to condensate on everything around it, and that just doesn't happen. At times in the summer here in the uk, (and I use the term summer loosely), we can get big swings between relative humidity and temperature. almost always the humidity % goes down significantly when the temp drops.
Another point to clear up any Tec(s) used will have, and require the cold side to be insulated / isolated. This proposed solution is to prevent condensation on the block surfaces & tubes.