Out of curiousity - why?
Let's suppose one could make the case that solar thermal pays for itself faster than PV, and solar thermal has a lower environmental footprint than PV - that is, the energy it takes to build a solar thermal system is less than a comparable PV system.
Suppose the advantages of solar thermal radiant heating were made clear. No obtrusive radiators, no unhealthy dust being blown through your house.
If all that could be demonstrated, would you still prefer PV over solar thermal? Why?
This is the sort of marketing TrendSetter needs to be doing, IMO. They have a strong case to make, they just need to make it.
And incidentally, TrendSetter does install PV as well as their own solar thermal.