Yep, wear sunglasses, it tastes epic and its actually pretty fun. Plus, it literally will light up after 2-3 seconds if focused correctly.
Yeah its real easy with the texas sun. you can even do it in fall in texas... Well some days you can.
I don't think heat has to do with how much sunlight gets to your house. If it's really sunny and bright on a good day here it's 65˚F in the spring. But the magnifying glass would work just as effective as another place where it's super sunny and bright and 80˚F.
Thae sun beams in Texas! I have a question.. Do you believe that areas are "warmer" than others because the sun is stonger there? Maybe the closer you are to the equator the hotter your climate is going to be? If true i bet a mag glass can really fuck shit up.