- We are a family-owned renewable energy company based in Horsham, West Sussex. We install and maintain solar PV, air source heat pumps and solar thermal systems in Sussex, Surrey, Kent and Hampshire. We carry out all our own installations and we never subcontract our work to third-party installers. At Sussex Solar we have a reputation for skilful work, using quality components on all our installations. Our customer testimonials are proof of our high standards of service and are a good indicator of the high quality of our work.