Framed by two of four 80-gallon water tanks in his home, Aron Cromwell, right, owner of Cromwell Environmental, gives a tour of his energy-efficient home at 1616 N.H. Cromwell's superinsulated, retrofitted home features a solar hot water system and is one of six stops on a bus tour of energy-efficient homes Sunday.
Aron Cromwell's home has solar-generated electricity that provides 75 percent of the home's power.
Cromwell uses four 80-gallon tanks to store solar-heated water at his home.
The home's windows are superinsulated and retrofitted to reduce energy use.
Cromwell's energy-efficient East Lawrence home, at 1616 N.H., was built in 1911.