Building Envelope basically refers to the materials that make up your house. The floors, walls, windows, doors, attic, basement, etc. I'm also going to include home orientation and exterior items that impact your energy/water usage in this category.
Solar Thermal (ST) water heating is a great way to take advantage of free energy from the Sun. Before we go in-depth on how solar thermal water heating works, let's go over the bare essentials.
1) Solar Thermal water heating is different from Solar PV (electricity)
2) Solar Thermal water heating is different than Solar Thermal power generation.
I'm sure I'll be writing a fair amount about CFLs on this blog, because even though they make so much sense, there still seems to be a fair amount of misconception about them by some in the public.