As temperatures dip below freezing, some Brooklynites were out early, braving the cold. “Layers,” said a mother with her two kids. “And for the kids, even more layers”. For those staying home, officials remind tenants that landlords are legally required to turn on the heat. Apartments should be at least 68 degrees during the day, and at least 62 degrees overnight. The FDNY also warns New Yorkers to be extra careful when using a space heater inside their home, as they are a leading cause of house fires this time of year. They also say that gas stoves or ovens should never be used to heat up a home, as it could lead to carbon monoxide poisoning.