Residents of Windham and Raymond voted Wednesday to change the formula the towns use to split education costs in Regional School Unit 14.

The final vote, on a show of hands in the Windham High School auditorium, was 167 yes and 20 no.

The new cost-sharing structure will increase the tax burden for Windham residents, decrease the cost to Raymond residents and change the way capital improvements are funded. School board officials unanimously approved the new plan in January. The change will be phased in over three years.

Under the current formula, Windham pays 55 percent and Raymond pays 45 percent of school costs that exceed the state-required minimum. Under the new formula, Windham will pay 64 percent of school costs by the 2018 school year, with Raymond paying 36 percent.

Based on 2015 costs, a Windham resident with a home worth $250,000 will eventually pay $51 more a year for the public schools. A Raymond resident with a home of the same value will pay $90 less.

The change also will put most of the cost for any major capital expense on the town of the school where the capital improvement is to be done.

Raymond has been examining whether it will withdraw from the district, with questions about costs for school building upgrades.