Don't Wait for the First Cold Night: A Minnesota Landlord's Furnace Check

In Minnesota, a furnace that stops working in August is an inconvenience.

A furnace that stops working on a January night can quickly become an emergency.

That's why late summer is one of the best times for rental property owners to take a serious look at their heating systems. The objective isn't simply to make sure the furnace turns on. It's to identify the small problems that can become expensive service calls—or leave a tenant without adequate heat—once Minnesota winter arrives.

Turn the Heat On Before You Need It

One of the simplest things an owner or property manager can do is actually operate the heating system before the weather gets cold.

Turn the thermostat several degrees above the room temperature and let the system run through a complete cycle. Listen for unusual noises. Make sure warm air is reaching the rooms it should. Check that the thermostat responds properly and that the system shuts down normally after reaching temperature.

For boilers, confirm that radiators or baseboard zones are heating appropriately and look for evidence of leaking valves or piping.

Finding something unusual now gives you time to investigate it without turning the repair into an emergency.

Change the Filter—But Use the Right One

Furnace filters are inexpensive, yet they can have a significant effect on HVAC performance.

Minnesota's Center for Energy and Environment notes that a clogged filter restricts airflow, reduces efficiency and makes a furnace work harder; prolonged restricted airflow can damage the equipment.

One mistake I see owners make is assuming that a more expensive, higher-rated filter is automatically better.

It isn't necessarily.

CEE specifically cautions that a one-inch furnace filter with too high a MERV rating can restrict airflow. The correct filter depends on the furnace and filter configuration, so follow the equipment manufacturer's recommendations rather than simply buying the highest-rated filter on the shelf.

Know When a Professional Tune-Up Makes Sense

Not every furnace needs a repair simply because fall is approaching, but regular professional maintenance can provide useful information about the system's condition.

CEE recommends annual heating-system tune-ups and says a professional inspection may include checking worn components, cleaning the equipment, evaluating efficiency and checking carbon-monoxide levels.

The Minnesota Department of Health likewise recommends having fuel-burning appliances such as furnaces checked annually by a qualified heating contractor. Warning signs of combustion or venting problems can include soot, rusting flue pipes, unusual condensation and improper flame color.

For an older rental property, that inspection can also help an owner begin planning for eventual replacement rather than discovering unexpectedly that a 20-year-old furnace has reached the end of its economical life.

Look Beyond the Furnace

Heating problems aren't always furnace problems.

Walk through the property and check supply and return vents. Furniture, rugs and tenant belongings can restrict airflow. Look at exterior doors and obvious window drafts. Check basement mechanical rooms for stored items crowding equipment.

If the property has a humidifier, boiler, heat pump or other heating equipment, make sure those components are included in the inspection rather than assuming the furnace is the entire system.

And make sure carbon-monoxide alarms are installed and operational as required.

For Rental Owners, Heat Is More Than a Maintenance Issue

There is also an important legal distinction between recommended maintenance and Minnesota's actual requirements.

Under current Minnesota law, residential landlords must equip or furnish heat maintaining at least 68°F in areas intended for habitation, including kitchens and bathrooms, from October 1 through April 30, unless a utility company requires and instructs otherwise.

An annual tune-up itself isn't the point of that statute. Maintaining adequate heat is.

Preventive maintenance is simply one of the best ways to reduce the chance that an owner will be dealing with that obligation during an equipment failure in the middle of winter.

Maintenance Is Cheaper When You Control the Timing

This is a recurring theme in property management.

A furnace repair scheduled on a Tuesday morning in September is one thing. Trying to locate an available HVAC technician during the first below-zero weekend of the winter is something entirely different.

Good maintenance doesn't mean replacing everything before it breaks.

It means understanding the age and condition of the property's systems, watching for warning signs and addressing predictable problems while you still control the timing.

For Minnesota landlords, the heating system is one place where that planning can pay for itself very quickly.