CHICAGO (WLS) -- Temperatures have plummeted across the Chicago area Monday, with even colder temperatures set for Tuesday.
The National Weather Service has issued a Cold Weather Advisory was in effect until 11 a.m. Monday for LaSalle, DuPage, Kane, Kendall, Lake (IL), and northern Cook counties.
Another advisory went into effect at 9 p.m. Monday. It is set to expire at noon Tuesday.
ABC7 AccuWeather Meteorologist Tracy Butler says the highs Monday will remain in the single digits, with wind chills at -25 to -10.
Warming centers will open across the Chicago area for the bitterly cold temperatures.
Tuesday is forecast to be even colder, with wind chills of -25 to -15.
ABC7 AccuWeather Meteorologist Larry Mowry said overnight lows will drop anywhere from -10 in the northwestern suburbs to about 1 along the lakefront. Wind chills will be -25 to -20 early Tuesday morning.
The NWS says wind chills this cold could cause frostbite on exposed skin in as little as 30 minutes.
READ ALSO | How to spot and treat frostbite, hypothermia other winter health dangers
People are wrapped in layers on Chicago's Magnificent Mile on Monday night.
A group of students visiting from Argentina as sub-zero wind chills arrive.
"It's very different because in Argentina. We don't have this cold," said Lucas Maspero.
While it is cold outside, there are also some precautions homeowners need to take while indoors.
That is why ABC7 took a trip with an HVAC crew as they tended to homes here on the city's Northwest Side on Monday.
ABC7 spoke to one homeowner who says, for weeks, she has not been able to keep her house warmer than 68 degrees.
Margaret finally decided to make the call to get work done on her furnace, knowing temperatures are expected to drop below zero on Monday night.
"Check the thermostat. Get the furnace looked at, because it can be a horrible problem going forward. No heat in below zero, not good," Margaret said.
Brendan Brown works with Four Seasons Heating and Cooling.
SEE ALSO | School Closings: Chicago Area Complete List
He was kept busy on Monday, fixing house furnaces and plumbing issues on the heels of this brutal cold.
"Extremely busy, especially now more than ever because, I mean, if you look outside, you have freezing temperatures. I mean, I think all throughout this week it's going to be very, very cold," Brown said. "If the ducts aren't being cleaned or the filter's not maintained, you basically are starting restrict more air flow that goes through the house."
He says the biggest tips for homeowners, as winter grips our area this week, are to keep a slow drip on your faucets to prevent pipes from bursting and to change your furnace's filter every month.
Mowry said snow is possible Wednesday afternoon and Wednesday evening, which may produce a coating of snow. High temperatures are expected to remain in the teens all the way through Thursday and still staying cold on Friday and Saturday.
Finally by Sunday, the Chicago area may see temperatures climb into the upper 30s to around 40.