…Jamie Howland studies climate and energy at Acadia Center, a non-profit clean energy research organization. He said the declining price of a solar installation can make it a good deal, but “consumers have to do their homework and be careful.” Howland said customers should chart out any additional costs before going solar. If your roof is old and in need of replacement, for instance, do that before putting a panel on it. If there will be extra costs for things like tree removal, factor that in…