• A replacement window unit designed by researchers at the Fraunhofer Institute for Building Physics IBP in Kassel, Germany, comes complete with its frame, insulation and connections for other systems.
• The units are designed for installation from the outside and both replace less efficient windows and add to exterior insulation.
• The designers started with the idea of imitating minimally invasive medical techniques, thus hoping to minimize disruption to residents during renovations.

From the article:

Renovation projects to improve the energy performance of residential buildings involve a lot of messy construction work. Researchers have come up with a new modernization concept that reduces on-site installation times. ...