Single-family houses which are built before 1980 comes energy certification circuit 1.7.2017
Ask for more energy certificate legislation on the content of Markku Elg.
Ask for more solar electricity and heat production
Spring 2017 SunWatt .fi will beging solarenergy advisor service for private customer and business combany, including ROI
Sunwatt.fi also have possibilites advise you to buy all materials you need, Photovoltaic panels, solar collector, inverter etc.