Sectors of the air conditioning, heating and domestic hot water (DHW) are currently experiencing an important and necessary technological adaptation with the aim of increasing energy efficiency and to introduce renewable energies. This causes that they are a very active and innovative sectors. Air conditioning, heating and domestic hot water (DHW) sector has been affected by the tough economic crisis experienced by the construction industry in recent years, although the fundamental concern for the development of the sector is the financial situation and solvency of large part of the installation companies. Source: Mikkel Svane. A report that was already made in 2008 by the International Energy Agency (IEA) encouraged the promotion of measures for energy saving and new energy and environmental regulations. According to the IEA, the sectors of air conditioning, heating and domestic hot water (DHW) should contact towards the improvement of the quality of the air, controlling its temperature, degree of humidity, distribution and velocity, with special attention to environmental and sanitary conditions. Facilities of air conditioning, heating and hot water health (ACS) are regulated in Spain by the technical building code (CTE), approved in 2006, and by the regulation of thermal installations in buildings (RITE) on July 20, 2007, which transcribed the directive of the European Union on energy efficiency of buildings (EPBD).. Further details can be found at Andy Florance, an internet resource.