cold

Amirreza Mahmoudi is part of a research team which is focused on finding a retrofit solution for the heat pumps already being produced to make them frost-resistant. The most promising so far is an effort to integrate a membrane into a conventional heat pump to prevent frost.

Forecasters are warning of treacherous holiday travel and life-threatening cold for much of the nation as an arctic air mass blows into the already-frigid southern United States.

Bitter cold enveloping much of Canada has reduced the number of skiers on the slopes during the key Christmas holiday season, blunting industry optimism boosted by good early snow conditions and strong foreign visitor interest due to the weak Canadian dollar.