Have you considered a solar powered mini-split air conditioning system?
This remains way off topic for the board, a digression from a digression.
But for those geeks interested—
I’m looking at a PV system as well, entirely separately.
I have a flat roof that will hold 24 panels at 10 degree slope (zig-zag mount) if the city will let me (heritage protected area).
It will produce a lot of power at peak, maybe 9kW?, but still not enough for the HVAC at full tilt.
This is a rambling old house, zero insulation except the attic, very hot climate.
For this property, my existing air con situation:
I have a split air con system now, chilled water circuit, as well as a completely separate gas boiler for radiators and domestic hot water.
I want to replace the gas boiler with a high-temp heat pump system to stop using gas.
I am intellectually attracted by the efficiency of the ones that produce heat and cool at the same time.
But it may be impractical–they are not really aimed at residential users.
And even if it works, it might not ever pay back if I don’t use it enough.
So, the two options for me are
(1) Leave the separate air con system as is. It works, though it’s very old and will die at some point.
Replace the gas boiler with a high temp heat pump system that produces DHW, high temp hot water for radiators, and lower temp hot water for under-floor hydronic heat.
Something like the LG Therma V line or something.
(2) Toss the existing air con central unit (keeping the chilled water circuits and fan/coil units).
Replace that with a simultaneous heat/cool heat pump system that produces all my hot and all my cold water.
Something like the Aermec NRP line.
Or, of course, do nothing and hope the gas supply isn’t a problem.
But back to your suggestion–around here, if I were smart I’d do thermal solar, not PV. It is very sunny here even in winter.
The problem is that the distances aren’t convenient–the roof I would put it on is pretty far from where I need the hot water.
And I’m a sucker for technology.
I could probably complicate it by taking the medium-hot water from the solar thermal in winter as input to a smaller heat exchanger to do the temperature boost I’d need.
But none of that helps with air con.
My favourite recent geek tech for air con is a radiative film that gets colder if exposed to the sky…even in full sun.
It has fancy layers that cause it to radiate at a wavelength (8-13um) at which the atmosphere is transparent.
You can run water pipes along under it (and thence to a small chiller) to create, in effect, solar thermal air con.