So how do we sell each style?

The Dominant person wants to make decisions.  Don't ask him how the vacation went, ask him when he would like to start using the sun to pay part of his utility bill.  The Influencer has a hard time making a decision.  They will try to drift, they love to talk.  Keep them on target, stay focused.  Let them know the family and friends will love the fact they are helping to save the planet.  The Conscientious person needs to see details spelled out.  They want to know what sort of training your employees have had, and if you have a license and insurance to do this kind of work.  The Steady person realizes there are two reputations at risk, yours and theirs.  Before they recommend you to do the work, they want to know you have done this type of project before, and have a complete staff to be sure no problems will arise that can't be solved.  Warranties and guarantees are also real important. 

Back to where we started.  Use the questioning process to determine what the customer wants and needs.  Now show how your company, the products you are looking at, and your unique installation will do exactly what you said they will do.  Then show them how easy it is to proceed.  Ask a closing question.  This is not a closing question: Well, what do ya think?  That is not going to move the customer into action.  They may respond with a snippy remark about health care.  So ask something like this: When would you like to start lowering your carbon footprint?  When would you like for the sun to take over the majority of your electric bill?  Questions that ask for action, and an order.