Guardian: 1) Environmentally friendly installation is expensive All insulation is environmentally friendly. Some installation has better environmental credentials, but what matters is the energy it saves. There is something nice about insulating the loft with reused sheep fleece, or recycled bottles, but if the cost of the insulation is putting you off doing it don’t think twice: buy the cheapest. Some stores have sold insulation as cheap as £1 a roll in the past. All insulation takes energy to …