I don't know your tech ability, but if you have access to a unix box (or a mac, for that matter....)
put this in a crontab that runs every hour.
You'll obivously have to change the url to match your tag......
$ lynx --dump http://www.mytaglist.com/ethLogShared.asmx/GetLatestTemperatureRawDataByUUID\?uuid=0f1bd206-2022-4387-842a-70f259814e6e\&useDegF=1\&name=Boiler_Output | cut -f7 -d" "> ./b.txt; C=$(<./b.txt); echo "9*$C/5+32" | bc -l >> hourlyoutput.txt
If that doesn't make sense, email me, I'll host it for you.
Go Hokies.