<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div bgcolor="#FFFFFF" text="#000000"><div><font face="Helvetica, Arial,
sans-serif">
Opening windows depends on clients and weather. In say,
Chicago, there can be weeks when the temperature at night is not
below 70-75 and so is not an effective cooling option. In many
houses, people dont know or want to bother opening windows at
the right time. Based on the my walks through suburbia across
the US in the early evening when it is cool outside and the AC
units on house after house are running, I would venture to say
this is the vast majority of people.</font><br></div></div></blockquote></div><br><br>this leads to a question...in a refrigerated system, can you effectively distinguish the energy required for reducing sensible heat from the energy to reduce latent heat? The question arose on a project I am consulting on, in which the supposedly leading edge mechanical contractor designed an AC system that uses the dank, dark, and dismal 120 yr old basement as a return plenum. <br>
<br>but more to the point of this thread, it goes to the effect of opening windows at night in a humid climate, where carpets, bedding, and other furnishings absorb water vapor, and yield it back while the system is operating.<br>
<br>AA<br>