Growing demand for home insulation projects last year led Hallowell-based Sustainable Structures to add nine workers, more than doubling its work force. The building and energy services firm needs three more installers, said Curry Caputo, but it has stopped hiring.

A partner at the company, Caputo knows the federal stimulus money that helped homeowners pay for weatherization is almost all spent. Sizing up Maine’s new state government, he doesn’t expect the level of support for energy conservation that was a hallmark of the Baldacci years.

“We are all a little concerned about the future of efficiency funding in Maine,” said Caputo, president of the Maine Association of Building Efficiency Professionals. “It’s all having a cooling effect on our industry and the momentum we’ve gained.”