Greenwashing refers to false claims that a product or activity is environmentally friendly, especially when the claims are made by corporate PR and marketing divisions. Unintentional greenwashing may take place when an unjustified belief of environmental friendliness is actively maintained by well-intended people.

Permacomputing tries to base itself on physical reality rather than beliefs or positive social signals. Therefore, it is important to avoid being affected by greenwashing, be that intentional or unintentional. Claims should be questioned, and all the effects of every dependency should be accounted for. A lot of problems are related to buying new things (sometimes even if those things are solar panels), so a lot of greenwashing checks should be made before making purchases or advocating a hardware product.