STATEN ISLAND, N.Y. — New York City emergency officials activated a Code Blue alert effective 4 p.m. Wednesday through 8 a.m. Thursday in response to dangerously cold temperatures.

The New York City Emergency Management, in coordination with the National Weather Service, issued a Cold Weather Alert, prompting the NYC Department of Homeless Services to declare the Code Blue — a protocol that opens additional shelter beds.

Outreach teams will canvass all five boroughs to connect vulnerable New Yorkers to shelters. No one who is homeless and seeking shelter during a Code Blue will be denied.

Residents who see individuals experiencing homelessness and in need should contact 311 via phone or mobile app to request outreach assistance.

The city is urging residents to check on neighbors, relatives, and friends, especially older adults, people with disabilities and anyone who may have limited mobility or access to heat. Cold weather can be dangerous, and some people may be unable to safely leave their homes or operate heating equipment on their own.

Buildings without heat or hot water should be reported immediately to building supers, property managers or owners. If there is no resolution, residents should call 311. NYC heat rules, effective Oct. 1 through May 31, require indoor temperatures of at least 68 degrees between 6 a.m. and 10 p.m. when outdoor temperatures fall below 55 degrees.

Between 10 p.m. and 6 a.m., indoor temperatures must be at least 55 degrees when outdoor temperatures drop below 40 degrees. Hot water must be maintained at 120 degrees.

Financial assistance is available for residents struggling with energy bills through the Energy Affordability Program, which offers monthly bill discounts. State law protects households from utility shutoffs between Nov. 1 and April 15.

For help with utility issues, residents can call the New York State Department of Public Service at 800-342-3355.

Officials are warning residents to practice fire safety during cold weather. Space heaters should be kept at least three feet from anything flammable. Plug them directly into wall outlets — never use extension cords or power strips. Turn them off when you leave the room or go to sleep. Stoves or ovens should never be used to heat homes.

Residents should check smoke alarms and carbon monoxide alarms and replace batteries if needed. Anyone who smells gas or hears a carbon monoxide alarm should leave immediately and call 911.

Hypothermia can develop faster than people realize, especially in older adults Warning signs include confusion, slowed or slurred speech, intense shivering, drowsiness or loss of coordination. Anyone noticing these symptoms should call 911 immediately. While waiting for help, move the person to a warm place, remove wet clothing and cover them with blankets.

Additional information on winter weather safety is available at Be Ready NYC and FDNY Smart.