Everyone is being bombarded these days with which type of renewable will make the most dramatic effect to the energy efficiency of your home. Everyone loves solar panels (but which type), some like wind turbines, photovoltaic solar panels, and then there is all the different types of heat pumps as well as pellet burners, boilers etc.
Everything mentioned above can make a huge difference to individual running costs in a home or be completely ineffectual. Solar panels mounted on a roof facing every direction but south is a favourite of mine, or heat pumps with high running costs which can be attributed to low levels of insulation or poorly installed systems. The only way to correctly choose the correct renewable system is first take account of the homes existing energy efficiency and which Elements of the home that reduce the homes current energy efficiency.
Elements. The building fabric, solid or raised access floor – insulated? External wall insulated? Attic or roof insulation? Boiler type and heating controls? Using an immersion to heat your water during summer time or all year round? Existing windows; are they single, double or treble glazed or even Passive House Institute Certified Window Systems. http://www.pazen.eu/
A professional home energy assessment would help determine the best course of action to take in bringing your existing home up to today’s building standards or to even aim for a Certified Passive House Retrofit.