Solar PV from EvoEnergy working well. EvoEnergy gave
excellent service including, under their 5-year guarantee,
promptly fixing a problem that arose after installation.
Solar thermal from Daikin/Rotex (UK agent is Responsible
Energy Management of Bristol, www.remltd.org. Beautifully engineered system, hot water plus some heating assistance.
User manuals need improvement. It took me a while
to learn how to optimize the system.
I'm a scientist (and FRS) persuaded that the climate system is
under serious threat.
Carbon dioxide emissions are a permanent, irreversible,
and large input signal to the climate-system amplifier.
That's a simple fact from hard science about past climates:
I also share the kind of thinking well expressed in the book
"Eco-Republic" by Melissa Lane. Individual efforts to lower
carbon footprints are tiny in themselves, but potentially
important through social osmosis. So I try to do my bit
with domestic energy
My next step would be to convert to underfloor heating, difficult
though that is in an old (1938) house. The low running temperatures would greatly improve the utilization of solar heat.
But it may not be affordable and practicable for us. Nor would
massive insulative wall thickening.
It would be wonderful to have seasonal underground heat
storage (e.g. in our deep clay subsoil) but I suspect the
engineering isn't sufficiently reliable yet. The problem is
to achieve reliable injection of summer heat with very high
temperatures in the pipes and their surrounds.