Customers consistently praise the survey and design stage as thorough, data-driven and clearly explained, with installers taking time to walk through options, heat-loss calculations and the efficiency guarantee. The Heat Geek portal, grant and DNO paperwork are generally described as smooth, though a few reviewers noted slow portal updates or admin delays. Installs and commissioning are widely rated as neat, punctual and minimally disruptive, with teams cleaning up daily and patiently explaining controls at handover. Communication, professionalism and follow-up support stand out, with only a small number of reviews flagging post-install snags or response issues.