I live near Charlotte, NC where the high today was over 100. I came home and started my weekly water change on both my 75 and 29 gallon tanks. I syphoned/vacuumed and got out the python to refill. Usually, I stick a digital thermometer in the tank, see what the tank temp is and them match the tap temp within a degree before starting to refill. Today, with the temp so high outside (and in the crawl space of my house where the plumbing is, my tap water on ALL cold was over 83 degrees. Since I had already removed water (15 gallon from the 75 and 5 from the 29) I had to fill them back up. The temp in the 75 gallon went from 78.1 to 79.8. The 29 gallon wasn't quite that much with only a 1 degree change. Has anyone else experienced this and what do you do to prevent large temp changes? Our temperatures are supposed to get back to normal on Thursday so I hope I don't run into this again.