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<p>[QUOTE=&quot;digitect, post: 1509502, member: 38157&quot;]Daily fluctuations in humidity or heat can cause condensation. Coins are highly conductive and moisture is therefore more likely to form on their surfaces if not sealed from the environment.</p><p><br /></p><p>In other words, an attic is a terrific place to corrode coins and rot currency. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /> If you are unaware of these fluctuations, buy a small digital temperature AND humidity gage for both indoor and outdoor from the local home improvement store ($35) and observe the fluctuations hourly for a day or two. </p><p><br /></p><p>Turning off your HVAC at night or on vacation destabilizes the temperature and humidity to a lesser degree. Anyone with valuable coins, paper, art, cloth, wood, musical instruments, etc., should seriously consider keeping the HVAC about the same temperature and humidity 24/7. During dry seasons, the air should be humidified and during wet seasons dehumidified. (Plus, it feels better!)</p><p><br /></p><p>This approach is not free, but might be more cost effective than the damage by decomposition or corrosion of valuables. Museums take this approach. It may be simpler to isolate the valuables in a small room with it&#039;s own localized conditioning system if the home does not have a central system.</p><p><br /></p><p>You may be surprised to learn that maintaining 24/7 isn&#039;t that much more expensive. Some people think they save energy by opening all the windows at night. But in a high humidity location (like the US Southeast), this re-introduces a tremendous amount of energy back in to the house (in the form of humidity) that the system just spent the entire day extracting. It doesn&#039;t cost that much to cool at night since it is so much cooler. The bigger benefit to collectors is that this greatly reduces humidity spikes![/QUOTE]</p><p><br /></p>

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