Maryland has a $1,000 grant, an SREC program where solar customers receive about $140/year for their renewable energy credits, a favorable net metering program, plus state and federal tax credits. https://www.energysage.com/solar-panels/solar-reba...Regarding your guess that 30-50% of homes with solar have the panels removed during a sale: If you have seen or heard of solar panels being removed it is likely they are old 4'x10' tilted up solar thermal panels, rare relics which heat hot water or glycol.

Solar hot water systems (popular in the Carter administration), used large, usually tilted up panels on the roof to preheat hot water or glycol in order to lower the homes electricity and/or gas consumption and to heat hot water.

Sun hits the panels, glycol gets hot and goes to a storage tank inside, then into the radiant floors.

A savvy architect, knowledgeable of both building and fire protection codes, with the energy to muddle through the process, could prove to be very valuable.And since the sprinkler piping was installed in the attic spaces, we used a glycol system to prevent freezing.What's driving the requirement for a second water line... is the existing line too small to handle the sprinkler demand or do they want the lines isolated?  

This would probably be true if the vapor was truly just water, but the primary ingredients in e-juice are propylene glycol and vegetable glycerin, both of which are actually a very thin oil.