This sort of smug "Did you not invest in solar in order to decrease your carbon footprint?" with the implied "Why did you expect it to save you money?" argument is not going to be productive if your goal is reducing emissions.
Selling solar as a means to lower your costs in an environmentally friendly way, then raising prices in a way that cancels out those savings and smugly telling angry people that they were supposed to do it for the environment without concern for cost to themselves is only going to make them less receptive to your cause.
Selling solar as a means to lower your costs in an environmentally friendly way, then raising prices in a way that cancels out those savings and smugly telling angry people that they were supposed to do it for the environment without concern for cost to themselves is only going to make them less receptive to your cause.