The Northeast Sustainable Energy Association’s Green Buildings Open House Tour takes place Saturday, October 5, and for the second year NESEA is teaming up with EnergySage to provide an online database of the hundreds of houses that will be open to the public.The Open House Tour is in its 14th year. It’s affiliated with the American Solar Energy Society’s National Solar Tour, which takes place on the same day. The National Solar Tour includes about 5,000 solar-energy sites around the country, which can be located with the help of a link at its website.Plug in your zip code and how far you’re willing to travel and you will get a list of participating properties.NESEA’s database includes car dealerships, churches, apartment buildings, and public buildings as well as houses. Each listing includes a description of the energy-related upgrade and how much it’s expected to save annually. Technologies include photovoltaic systems, solar hot water systems, ground-source heat pumps, wind turbines, and biomass and biofuel appliances.