I've been successful in cold weather like this by providing space that is ventilated near the roof so that no drafts are blowing on the chickens in the coop, wrapping our run with heavy plastic (1/3 of roof is actually hardware cloth), and then hanging tarps/large area rugs inside the run to create an outdoor area around the coop that is also free of drafts. It really does feel warmer in the run and coop because the wind has been blocked.
I also feed them plenty of protein. One of the younger ranchers out here advised me early on that animals can survive the cold in those conditions as long as you feed them plenty of protein. So, my chickens eat pretty well in this weather: rice with oregano, cayenne pepper and a little coconut oil; cornbread made with coconut oil and cayenne pepper; 'fried' rice with scrambled eggs, spinach and cocktail shrimp; canned corn; scratch (of course); oatmeal. Depending upon how cold it is, I feed them 3-4 meals throughout the day, something warm when they come out of the coop in the morning, and something warm before they go to bed. Oh, and cayenne pepper helps to keep them warm but the capsaicin doesn't burn their mouths. Just don't go overboard with it.
Also, I heated bricks in the oven this last storm - about an hour at 400 degrees. Wrapped them in thick towels so that the heat would dissipate more slowly and nestled the bricks down in the bedding under the roosts. I also use deep litter method which does seem to raise the temp about 10 degrees in the coop. Our electricity service is very unstable in bad weather so I never use constant heat as they would then be without it once the electricity went out (a friend lost about a 1/3 of her flock in the 2021 deep freeze for that reason). It feels like a nonstop job keeping them warm during storms, but they have emerged from the latest storm unscathed.
I hope your flock made it through the storm OK!