We moved into our house four years ago and have enjoyed a constant comfortable temperature at very reasonable cost. The energy consumption equates to a BER rating of A2. BER is actually better as our energy use also includes energy use for cooking, lighting, sockets,etc. as well as space heating and domestic hot water.
The system includes air to water heat pump, underfloor heating, solar tubes, heat recovery ventilation and thermostats on each circuit.
Controls are easy to use and ongoing advice was provided quickly when requested.
At the design stage,we were encouraged to be involved and options discussed. The installation was efficient.
I am happy to recommend Greentherm.