WINDHAM (AP) — Summer isn’t officially here yet but Maine residents who heat their homes with wood are already thinking about next winter.

Mark Killinger, owner of Atlantic Firewood, and other firewood dealers say homeowners are calling early and ordering more wood than normal, while memories of last winter’s brutal cold are still fresh.

Wait too long to order firewood this year, dealers warn, and it may be hard to get come fall. By late summer, some say, seasoned wood may be especially hard to find.

Killinger tells the Portland Press Herald that if someone calls him today to order green firewood, he’ll deliver at the end of June.

Wood heat is in favor again because based on British thermal units, it’s currently far cheaper than oil.