PORTLAND, Maine — Plunging temperatures across half the country Thursday underscored a stark reality for low-income Americans who rely on heating aid: Their dollars aren’t going to go as far this winter because of rising energy costs.

Forecasters warned people to be wary of hypothermia and frostbite from an arctic blast that’s gripping a large swath from the Midwest to the Northeast, where the temperature, without the wind chill factored in, dipped to minus 32 Thursday in Watertown, N.Y.

Even before the cold snap, the Department of Energy projected that heating costs were going to track upward this winter, and many people are keeping an eye on their fuel tanks to ensure they don’t run out.

The burden caused by higher prices and higher energy usage is felt by all Americans, especially those who struggle to stay warm.

Elizabeth Parker, 88, of Sanford, Maine, said she lives in fear of running out of heating fuel and remains vigilant in monitoring the gauge outside her trailer. She said she is allowed to request a fuel delivery thanks to federal aid, but only when her gauge dips to one-eighth of a tank.

“I couldn’t get along without it,” said Parker, who lives with her 93-year-old husband, Robert Parker, along with a cat, a dog and four birds.

Prolonged, dangerous cold weather this week has sent advocates for the homeless scrambling to get people off the streets and to bring in extra beds for them. Warming centers also were set up in some locations.

President Donald Trump tweeted, “In the East, it could be the COLDEST New Year’s Eve on record.”

He added, “Perhaps we could use a little bit of that good old Global Warming that our Country, but not other countries, was going to pay TRILLIONS OF DOLLARS to protect against,” he wrote, referring to the Paris climate accord.

Frozen pipes and dead car batteries added to the misery across the region.

In Ohio, a dog was found frozen solid on the porch of a house in Toledo.

Despite the cold, there was some good news for recipients of federal aid from the Low-Income Home Energy Assistance Program. Trump released nearly $3 billion, or roughly 90 percent, of the funding in October after previously trying to eliminate the program.

But projected energy cost increases will effectively reduce the purchasing power by $330 million, making it imperative that the remaining funds be released, said Mark Wolfe, executive director of the National Energy Assistance Directors’ Association.

This winter, energy costs were projected to grow by 12 percent for natural gas, 17 percent for home heating oil, 18 percent for propane and 8 percent for electricity, according to the U.S. Energy Information Administration.