4 houses that are earth-friendly and for sale

This four-bedroom, two-bath house in Franklin Square has a south-facing greenhouse. The house is on the market for $309,000. Listing agent: Madeline DeFlores, Bernard Miglio Real Estate, 516-270-3780.

This four-bedroom, 31/2-bath Victorian in Mount Sinai has a solar electric system, solar hot water, solar-powered exterior lights and a solar-heated saltwater pool. The house is on the market for $899,000. Listing agent: Ray Manzoni, Manzoni Real Estate, 631-928-1188.

This three-bedroom, 11/2-bath Colonial house in Bayville has new energy-efficient heating and cooling systems, appliances and windows, with some added insulation. The house is on the market for $549,400. Listing agent: Kathy Borg, Daniel Gale Sotheby's International Realty, 516-759-4800.

This three-bedroom, 11/2-bath ranch in Bohemia has solar hot water and some updated windows. The house is on the market for $399,900. Listing agent: Rose Mary Bruno, Bruno Realty Consultants, 800-448-5191.