The American Wind Energy Association, a trade group in Washington, recommends placing the turbine at least 30 feet above anything in a 500-foot radius, said Ron Stimmel, a specialist in small wind turbines at the trade group American Wind Energy Association, in Washington. “That way the wind can stretch its legs a bit.” For these taller towers, homeowners should be aware that they may have to deal with local rules prohibiting structures higher than 30 feet or so.

State and federal incentives will whittle down the price tag for many prospective buyers. For instance, about half the states have some sort of incentive, Mr. Stimmel said. The New York State Energy Research and Development Authority, for instance, covers up to half of the homeowner’s initial cost for a wind turbine.