Winters in the Iowa Great Lakes region are long and cold. In Spirit Lake, January highs average just under 25°F and overnight lows average around 9°F, with December and February not far behind. Subzero stretches are common, and the town’s record low sits at -39°F, set back in 1899. Add the wind that sweeps across open water and frozen lakes, and homes here face more heat loss than many other parts of Iowa.
Keeping your house warm in winter comes down to three things: a heating system that runs reliably, a home that holds onto the heat it produces, and smart habits that make the most of both. Here is how to cover all three.
Start With a Furnace Tune-Up Before the Deep Cold Hits
Your furnace or boiler is doing the heavy lifting from October through April. A system that is dirty, out of adjustment, or wearing out will struggle to keep up on a 10-below night, and those are the nights when a breakdown is the most dangerous and the hardest to schedule around.
A professional furnace tune-up covers the items most homeowners cannot easily check on their own. A technician will inspect and clean the burners and flame sensor, check the heat exchanger for cracks, test the igniter and safety controls, verify gas pressure and airflow, and look over the blower motor and belts. They will also confirm the system is venting properly, which matters for carbon monoxide safety when the house is closed up tight all winter.
Routine furnace maintenance pays off in a few ways. Your system runs more efficiently and uses less fuel. Small problems get caught before they turn into a no-heat call in the middle of January. And a well-maintained furnace tends to last longer, putting off the cost of a replacement. CW Suter’s HVAC maintenance plan schedules this service for you every year, so it does not slip through the cracks.
Change Your Furnace Filter More Often in Winter
A clogged filter is one of the most common reasons a furnace is not heating the way it should. Restricted airflow makes the system work harder, can cause it to overheat and shut down, and leaves rooms farther from the furnace feeling cold. During heavy-use months, check your filter every month and replace it when it looks gray or dusty. Learn more about our filter program and sign up today to receive automated shipments so you never forget to change your filter!
Know the Signs Your Furnace Needs Repair
Call for furnace repair if you notice any of the following: the furnace runs but blows cool or lukewarm air, it cycles on and off frequently, you hear banging, squealing, or rattling, the pilot or burner flame looks yellow instead of blue, or your heating bill jumps without a change in how you use the system. Any of these can be an early warning that something is wrong, and an early repair is almost always cheaper than an emergency one.
Find and Fix the Drafts in Your House
A drafty house can undo much of the work your furnace is doing. Cold air leaks in, warm air leaks out, and your heating system keeps running to make up the difference. In a windy lake community, those leaks can be significant.
Start with the obvious spots. Feel around windows and exterior doors on a cold, windy day. If you can feel moving air, add or replace weatherstripping and caulk gaps around the frames. Door sweeps on exterior doors make a noticeable difference for very little money. Heavy curtains or cellular shades help windows hold heat at night.
Then look at the less obvious places. Outlets and switch plates on exterior walls, attic hatches, recessed lights, plumbing and wiring penetrations, and the rim joist in the basement are all common sources of air leaks. Foam gaskets behind outlet covers and weather stripped, insulated attic hatch are quick fixes. If your attic insulation is thin or compressed, adding more is one of the best investments you can make in a cold climate.
Check Your Ductwork
If some rooms are always colder than others, the problem may be your ductwork. Leaky or poorly connected ducts that run through unheated spaces like crawlspaces, garages, and attics can lose a large share of the heat before it ever reaches a vent. Ductwork sealing and insulation can help even out temperatures and lower your heating costs. A CW Suter technician can inspect your duct system and recommend repairs during a heating service visit.
Use Your Thermostat Wisely
The right thermostat settings in winter balance comfort and efficiency. The U.S. Department of Energy suggests around 68°F while you are home and awake, and turning it down several degrees while you sleep or are away. Because Spirit Lake winters are so cold, avoid deep setbacks for long periods, and never let the house drop below 55°F, which is the general guideline for protecting your plumbing from freezing.
A programmable or smart thermostat does this for you automatically. SENSE by Suter smart thermostats let you adjust your schedule and check your home’s temperature from your phone, which is a big help on a cold night when you want to make sure the heat is still running.
Add Humidity to Feel Warmer at the Same Temperature
Winter air in northwest Iowa is extremely dry, and running the furnace dries it out even more. Dry air pulls moisture from your skin, which makes you feel colder than the thermostat reading. It also leads to static shocks, dry sinuses, cracked wood floors, and gaps in trim.
Keeping indoor humidity between roughly 30 and 50 percent makes your home feel warmer, so you can often lower the thermostat a degree or two without noticing. Portable humidifiers work for a single room, but a whole-house humidifier connected to your furnace treats every room and requires far less upkeep. Learn more about humidity control and other indoor air quality solutions from CW Suter.
Keep Warm Air Moving Where You Need It
A few simple habits help your home use the heat it already has:
- Keep supply vents and return grilles clear of furniture, rugs, and drapes.
- Run ceiling fans clockwise on low to push warm air down from the ceiling.
- Open south-facing curtains during sunny afternoons and close them after dark.
- Close the fireplace damper whenever the fireplace is not in use.
Be careful with space heaters. They can help warm a single cold room, but keep them at least three feet from anything that can burn, plug them directly into the wall, and never leave them running unattended or overnight. If you are relying on space heaters to stay comfortable, that is a sign your heating system or home needs attention.
Does a Heat Pump Work in Spirit Lake Cold Weather?
Many homeowners ask whether a heat pump can keep up with Spirit Lake winters. Today’s cold-climate air-source heat pumps perform much better in low temperatures than older models, and in northwest Iowa they are usually paired with a furnace as a backup for the coldest days. Geothermal heat pumps are another strong option because they draw heat from the ground, which stays at a steady temperature year round no matter what the air is doing. If you are considering a new system, CW Suter can help you compare heating installation options including high-efficiency furnaces, boilers, mini-splits, and geothermal.
Tips for Lake Homes and Seasonal Properties
Many homes around Spirit Lake, West Okoboji, East Okoboji, Arnolds Park, and Milford sit empty for part or all of the winter. An unoccupied lake home comes with its own risks, since a furnace failure can go unnoticed for days while temperatures inside fall below freezing.
If you are closing up a lake home or cabin for the season, schedule a furnace inspection before you leave so you know the system is in good shape. Set the thermostat no lower than 55°F, and consider a smart thermostat that sends an alert to your phone if the indoor temperature drops. Have someone you trust check on the property regularly. Shut off and drain the water supply if the home will be vacant for an extended period, or have a plumber winterize the system for you. These steps help protect your heating system, your plumbing, and everything else inside the house.
When to Consider Replacing Your Furnace
If your furnace is 15 years or older, needs repairs every winter, or cannot keep your home comfortable even after a tune-up, replacement may be the better long-term choice. A new high-efficiency furnace can noticeably lower your heating bills and deliver more even comfort through the whole house. CW Suter offers free, no-obligation quotes on new systems and flexible financing options to make an upgrade more manageable.
Stay Warm This Winter in Spirit Lake With CW Suter
CW Suter has kept homes in northwest Iowa warm for nearly 100 years, and our Spirit Lake team serves the entire Iowa Great Lakes area, including Okoboji, Arnolds Park, Milford, and the lake homes along West and East Lake Okoboji. Whether you need a furnace tune-up, a repair on a cold night, help with a drafty room, or a new heating system, our technicians are ready to help.
Contact CW Suter for heating service in Spirit Lake, IA and schedule an appointment online for a free, no-obligation quote. If your heat goes out, 24/7 emergency service is available at (712) 215-6222.