High or Low?

I feel like an icicle. It has been hot in Texas for the past 3-4 months now, and the past few days the temperature has been up to 100. For a non-Texas girl, I think I have adjusted pretty well. One of the ways I can measure I am doing good with heat is that we set our thermostat to about 78-80 in the house. This feels just great. Sometimes, I even turn it higher than that, and I run some fans. My parents are here visited, and they are not used to the heat. One of the things that comes with that is that they like to have the thermostat lower. It's kind of nice until I go to bed. Last night I woke up several time, freezing! I also have a stuffy nose this morning and generally feel miserable (or is that because I have been sleeping on the futon?). Don't get me wrong, I am happy to give up my bed for a week for my parents. We're gonna have to figure out a happy medium though, temperature wise. In general, I don't understand that you almost have to wear a sweater during the summer, especially in church, school, grocery stores etc. Pretty much all public places. In the winter our thermostat is set to 68, and in the summer it's set to 78. Mostly because I'm wearing the clothes to accommodate those temps. Oh, and I guess it's helpful for the pocket book too.