Type a date and then click Show Chart. If you're using Chrome, then the HTML5 pieces work, but not yet in Firefox 13

Today's Temperatures
Missing values are where Windows Task Scheduler is demonstrating itself to be an inferior way of executing a task.

HVAC Runtimes

Several Days Temperature History
Try showing a range of dates

All Time Indoor History
Hi/Low temps

All Time Outdoor History

Alternative sources of outdoor temp - need a voting system to pick the consensus temp with a preference for one particular sensor
Weather Underground outdoor temp is http://api.wunderground.com/auto/wui/geo/WXCurrentObXML/index.xml?query=90210<-999>