Insulation offers the greatest ‘bang per buck’ and has the fastest payback time of all of the measures Insulation reduces your homes heat loss, reducing your energy costs and emissions. There are Four Main Types of insulation: Loft Insulation, Wall Insulation, Floor Insulation and Pipe Insulation. The type of house that you live in determines what type of insulation is most suitable. Older homes will often need specialist, breathable solutions whilst smaller terraced properties with single skin brick walls are candidates for external insulation. A benefit of external insulation is that it saves space inside and improves the appearance of many houses.