What do the technical terms mean?

• in electrical engineering
  Topics like: Erthing, Mains structure, Potential equalization

• in heating and air-conditioning
  Topics like: Heating otput, Heating threshold, Hydraulic balance, Modulation

• statistics heating / air-conditioning / data-gathering
  Topics like: Boiler efficiency, Burner running time, Heating degree-day

Other lists we liked

http://www.bayern.de/lfu/umwberat/

Dictionary of the Bavarian Ministry of State - including environmental terms (German)

http://www.e-smog.ch/lexikon/

Lexicon with Info about electrosmog (German)

http://www.solarserver.de/solarmagazin/

The Renewable Energy Sources Act (German/English)

http://www.bibliothek.fh-aachen.de/

Specialist library of Technical College in Aachen - with download possibility (German)