Be careful as to how the systems are addressed by the writer of the course. Some writers are advocates for solar/green and ignore the economics, financial impact. Example from my own experience: a subdivision was built, 'green high-efficiency' construction, all the bells and whistles except for solar. New cost was a good 25% higher than competing homes of similar design, finish. At resale, no premium was paid, seller lost a lot against going-in cost. As to solar, we looked at a solar owned for a 1800 SF home. Cost was $42K (got docs). Over the probable holding period of the home, discounted return on utility cost was approximately 1/3 of cost which fit nice
Into the final sale price of the home. Yet advocates will often tout the 'savings' while ignoring the financial realities (return on investment.
