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ST. PAUL, Minn. -- Being in high demand on day featuring subzero temperatures usually means you work in heating or plumbing.

"Very busy time of year, anytime the temperature gets around zero things just start breaking," AAA Wicks plumber Karl Dodge said Monday morning while out on a call for a frozen pipe break in Woodbury.

Dodge said that kind of call has been the most common over the last few days.

"Definitely weather related. Wind is beating on it with 50 degrees below wind chill and the inside of the wall gets cold and everything starts freezing up," Dodge said.

KARE 11 tagged along on a call in which a pipe that was connected to outdoor spigot froze and burst.

The experts said a way to have prevented that would have been to turn the valve for that pipe off in the first place but since that didn't happen and because it was just so cold, it burst.

The best tip Dodge said overall for pipe health when it gets this cold, keep the house temperature nice and toasty, about 71 degrees.

"Try to keep as much heat as you can going into the walls and that will prevent you from having to meet me in person," Dodge said with a smile.

As far as the other super nice guy you don't want to meet professionally?

"If the furnace had a weakness or a flaw heading towards failure, they probably chose last night to fail," Standard Heating and Air Conditioning furnace tech Seth Roe said of the bitter cold temperatures beating down old furnaces.

Roe knows his full time job is all time now.

"Hunker down, you are working a long day. Can't leave people without heat, can't do it," Roe said.

24 hours a day, that's the furnace fixing schedule.

When it's this cold the furnace can clunk out because it's just overworked, Roe says there is no universal problem that is plaguing them.

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