Energy Beastiary & Glossary by NEB Staff Ah, what strange and curious creatures roam untamed in the interstitial spaces wreaking havoc on our heating bills and the unwary contractor! Anyway you cut it, energy is a tough nut. With the exception of a few wavelengths of visible light, it's mostly invisible, very slippery, hard to measure, and always rising in price. And the jargon doesn't make it any easier. But don't be intimidated. The next time you're called upon to wrestle the wily Btus, just keep this guide close by. In no time, you'll be running circles around convective loops and have anomalies eating out of your hand. Study well. salesman's commission. Lost R-Value—This