You could nail down a couple of 1x4 sections in a little box around each leg, hopefully they wouldn't try to jump the piano over it. We had some rooms with really bad bunching carpet so I was concerned about the legs and casters. I tried putting a Do Not Move sign on the pianos, but it was only somewhat successful. Then, one day someone pushed a piano and the caster jammed and came out of the leg. The piano was fine, but it was scary enough that I could get the department to pay for a grand piano spider-type dolly. That created the idea that the grand dollies were good, so later it was easier to get them to buy more. In one case, there were two professors who had a disagreement over how the piano should be situated in a theory/ear training classroom. I was able to help by installing a dolly, solving not only the piano problem, but I was also seen as settling the dispute to everyone's satisfaction. I know this doesn't address your heat/ac concerns, but it's something to think about. <div class="gmail_quote">On Wed, Mar 2, 2011 at 9:27 AM, Joe Wiencek <<a href="mailto:joespiano@gmail.com">joespiano@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> Thank you, gentlemen. Wim, do you mean like an, "ahoy there, matey!" anchor, or fastening the piano to the floor via a chain to the bracing? Because I could see both working, but a ship anchor is not readily available at my local hardware store. Joe </blockquote></div>