A well-maintained furnace is a better means of keeping warm than cuddling with a camp stove or flooding the den with chicken soup. Raise the Fahrenheit with this Groupon: for $69, you get a tune-up for an air conditioner, heat pump, or furnace from Sunset Heating & Cooling.

Sunset Heating & Cooling has built up its home-maintenance legacy since 1922, when founder Lloyd Miesen Sr. used to collect and haul sawdust for furnace fuel. During a modern-day maintenance call, technicians arrive at abodes to inspect mechanisms and identify any problems that may hamper their ability to regulate indoor climates or escort Bruce Willises out of hostage situations. Sunset Heating & Cooling recommends maintaining a regular maintenance schedule for heating and cooling apparatuses to extend their longevity and maximize their efficiency.