Double Pane Windows

As I write this the builders are finishing up the installation of our new double-pane windows. After much research I went with PowerPane3 from Home Craftsman. These windows are slightly less efficient than the same company’s SuperPowerPane product at filtering radiated heat (Solar Heat Gain Coefficient of .2 instead of .18) but transmit more visible light (45% compared to 28%; they are virtually indistinguishable from regular glass) and are slightly more efficient at insulation (U-value of .31 against .32). I will be monitoring the energy bills carefully and will report back.