We had direct contact with a number of employees from FDG and they were all very prompt in responding via email and phone. They did visits and surveys and reports with a very quick turnaround and the installation was surprisingly done (including 16 new radiators!) in the 3 days they promised - and they made sure that we weren't left without hot water and only one night without heating during the installation process. When there was an issue with "balancing" the system, someone came out within a few days and spent 3 hours sorting it out. We're happy with our efficient new heat pump :-)