Everyone has heard stories of dodgy double-glazing firms who duck out of their guarantee obligations by folding the company and then starting it up again under a different name. In order to combat this practice and give consumers some come back for security, "insurance-backed guarantees" have been introduced.
Basically an insurance-backed guarantee works because the insurance company, and not the installer, takes responsibility for the guarantee and so will honour it if the installer folds.
All Homeshield installations come with a free 10 year insurance-backed guarantee.