cost/benefit studies were made comparing Jee with a normal window. the items studied were:

 - materials  (aluminium, thermal mortar, cork, glass) 

 - manufacture

 - energy costs

 - eco-efficiency

 - climate (sun and temperature)



THE BASIC STANDARD DIMENSIONS OF JEE ARE:

1,5 x 2,0  (3,0sqm)



the investment payback time depends on:

 - energy costs (higher cost less time)    

 - local climate 

 - the building  (envelope and solar orientation)



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THE STUDIES CONFIRMED THAT JEE INVESTMENT CAN BE BACK in 7 TO 9 YEARS 



(Jee building system is state of the art in thermal efficiency. besides that Jee uses solar energy to reduce light and heat needs saving energy and money)