<html> <body> Roger, thanks for forwarding the password reminder, and your response. <blockquote type=cite class=cite cite>The undercover was developed to allow better system performance in drafty environments.</blockquote> As best as I could tell, there is not any discussion of the covers on the web site, and thus, my questions remain somewhat unanswered.  I understand the benefit of the undercover in a situation such as you describe above.  That would seem to indicate the reduced air exchange as the target effect.  Since I recall some early installations I did in rather small, underventilated practice rooms and the mildew problems that ensued, I raised that question.  Andrew Anderson's response does not really address my expressed concern regarding the effects of that much heat, regardless of the humidity. David Skolnik At 06:32 AM 6/21/2004 -0600, you wrote: <blockquote type=cite class=cite cite>One should keep in perspective what elevated heat means, look at the wattage.  It is a simple matter of physics that warmer air can hold more water.  When you make that environment under the piano warmer than the surrounding air you dry it out. The concern would be more about adding heat to an environment you want cooled (your front room/etc.).  Still, I think the longevity of the piano should win out.  I've seen too much humidity cycling damage in older pianos in the western states I've worked in to give much weight to comfort considerations. Andrew At 05:11 AM 6/21/2004 -0400, you wrote: <blockquote type=cite class=cite cite>At 06:06 AM 6/20/2004 -0400, Terry Farrell wrote: <blockquote type=cite class=cite cite>I own a Boston GP-178, which is located in my home. I have about five rods on it totaling about 190 Watts. The unit runs 80% of the time during periods of high humidity. I do not have a bottom cover nor a string cover. The tunings/pitch are steady as a rock.</blockquote> So, does this mean that, as long as the humidity remains at or above the humidistat setting, elevated heat in proximity to the soundboard is not a concern? Also, since I have forgotten my technician password for the DC website, what is the intended purpose of the cover?  Is it to prevent heat or humidity loss (upward) or eliminate air exchange (bottom)?  Is there any concern about mold or mildew conditions in such a contained environment? David Skolnik _______________________________________________ pianotech list info: <a href="https://www.moypiano.com/resources/#archives" eudora="autourl">https://www.moypiano.com/resources/#archives</a></blockquote></blockquote></body> </html>