CK-12 Foundation
Ck 12: Physical Science: Thermal Conductors and Insulators
[Free Registration/Login may be required to access all resource tools.] Thermal conductors and insulators and the ways they are used.
The Wonder of Science
The Wonder of Science: Ms Ps3 3: Thermal Energy Transfer Solution
Lessons to show thermal energy transfer. Middle schoolers will "apply scientific principles to design, construct, and test a device that either minimizes or maximizes thermal energy transfer".
Science Buddies
Science Buddies: Bake Your Ice Cream
This activity will teach you how it is even possible to bake ice cream in a hot oven and have it come out frozen.