A Simple Checklist To Prepare Your Home For Subzero Temps

When winter in Wisconsin takes a turn toward the extreme, it can be costly and even dangerous if your home isn’t ready. Every year, residents in La Crosse face stretches of subzero weather that test heating systems, plumbing, and insulation. Knowing how to prepare your home for subzero temperatures before they hit can prevent frozen pipes, high energy bills, and emergency repair calls.

At Niebuhr Plumbing, Heating & Air Conditioning, we’ve seen firsthand how brutal cold can damage homes that aren’t properly protected. This checklist breaks down the most important steps to keep your home warm, efficient, and safe during extreme cold.

Step 1: Check And Maintain Your Heating System

Your furnace or boiler is your first line of defense against the cold. A little maintenance goes a long way toward preventing a breakdown in the middle of a subzero night.

1. Schedule a Furnace Tune-Up
Before the first cold snap, have your system inspected by a qualified technician. They’ll clean key components, check for leaks, and ensure it’s running efficiently. Preventive maintenance reduces the risk of midwinter failures.

2. Replace the Air Filter
A dirty filter restricts airflow, forcing your furnace to work harder. Change it every 1-6 months, depending on the filter you have. This simple step improves both efficiency and indoor air quality.

3. Test Your Thermostat
Make sure your thermostat is working properly and accurately reading the temperature. If you have a programmable or smart thermostat, set it to maintain consistent heat during cold nights.

4. Clear Heating Vents and Registers
Blocked vents prevent even heating and can cause your system to cycle unnecessarily. Move furniture, rugs, or drapes that cover vents.

5. Know the Warning Signs of Trouble
If your furnace starts making unusual noises, blows cold air, or struggles to keep up, don’t wait until it stops working. Contact Niebuhr before a small problem becomes an emergency.

Step 2: Protect Your Plumbing from Freezing

Frozen pipes are one of the biggest hazards during subzero temperatures. When water freezes, it expands and that can cause pipes to burst, leading to major water damage.

Here’s how to prepare your home for subzero temperatures and keep your plumbing safe:

1. Insulate Exposed Pipes
Wrap pipes in unheated areas—like basements, crawl spaces, and garages—with foam insulation or heat tape. Focus on pipes near exterior walls.

2. Keep Cabinet Doors Open
On especially cold nights, open kitchen and bathroom cabinet doors to allow warm air to circulate around plumbing.

3. Let Faucets Drip
A small, steady drip from your faucets keeps water moving, reducing the chance of freezing. Focus on the farthest fixtures from your water main.

4. Seal Air Leaks Around Pipes
Use caulk or expanding foam to seal gaps where plumbing enters walls or floors. Even a small draft can make pipes vulnerable to freezing.

5. Locate Your Main Water Shut-Off Valve
Know where your shut-off is in case a pipe bursts. Turning off the water quickly minimizes damage until repairs can be made.

6. Disconnect Outdoor Hoses and Shut Off Exterior Faucets
Drain hoses and close shut-off valves for outdoor spigots. Leaving hoses connected traps water that can freeze and burst the faucet or connected pipes.

Step 3: Improve Insulation and Seal Drafts

A well-insulated home retains heat and lowers your energy costs during extreme cold. Proper insulation also helps protect pipes and mechanical systems inside your walls.

1. Add Weatherstripping Around Doors and Windows
Check for drafts by feeling around edges for cold air. Add or replace worn weatherstripping and use caulk to seal gaps.

2. Check Attic Insulation
Heat rises, and without enough attic insulation, it escapes quickly. Adding insulation can reduce heat loss by up to 25%.

3. Insulate the Basement and Crawl Space
Cold air often seeps in through unfinished basements and crawl spaces. Insulating rim joists and basement walls keeps floors warmer and pipes safer.

4. Close Curtains at Night, Open Them During the Day
During daylight hours, open south-facing curtains to let sunlight warm your home naturally. Close them at night to trap that heat inside.

5. Use Door Draft Stoppers
Simple fabric stoppers placed at the bottom of doors can block cold air from entering under thresholds.

Step 4: Check Carbon Monoxide and Smoke Detectors

When you seal up your home and run your furnace nonstop, safety devices become even more important.

• Test carbon monoxide detectors and replace batteries if needed.
• Install detectors on every floor and near sleeping areas.
• Make sure smoke detectors are functioning properly.

Furnaces and other fuel-burning appliances produce carbon monoxide, so these alarms are critical during heating season.

Step 5: Keep an Emergency Heating Plan

Even with preparation, Wisconsin weather can be unpredictable. Power outages or furnace issues can happen. Having a backup plan helps protect your family and your plumbing during those emergencies.

1. Identify Backup Heat Sources
Keep space heaters on hand, but only use them safely. Make sure they’re away from flammable materials and never unattended.

2. Use Fireplaces Safely
If you have a fireplace, make sure the chimney is clean and the damper works properly. Never use outdoor grills or stoves indoors for heat.

3. Have Blankets and Extra Layers Ready
Stock up on warm blankets, sleeping bags, and winter clothing in case of power outages.

4. Keep Doors Closed in Unused Rooms
This traps heat in smaller spaces and conserves energy during an outage.

Step 6: Maximize Energy Efficiency

When subzero weather hits, your furnace works harder than ever. Improving efficiency not only saves money but helps your system keep up with demand.

1. Maintain Consistent Temperatures
Avoid large thermostat swings. Keeping the temperature steady helps your furnace run efficiently and prevents stress on components.

2. Reverse Ceiling Fans
Set ceiling fans to spin clockwise at low speed to push warm air down and distribute heat evenly.

3. Unblock Radiators and Baseboards
Ensure furniture and curtains don’t obstruct heat flow. Even partial blockages reduce efficiency.

4. Upgrade to a Smart Thermostat
Smart thermostats automatically adjust temperatures to your schedule and provide energy-use insights. Over time, this can lower heating costs significantly.

5. Schedule an Energy Audit
If high bills persist, a professional home energy audit can identify air leaks, insulation gaps, and system inefficiencies.

Step 7: Prepare the Exterior

The outside of your home also needs attention before the temperatures plummet.

1. Clear Gutters and Downspouts
Blocked gutters can lead to ice dams, which damage roofs and cause leaks. Clean them before freezing weather sets in.

2. Inspect the Roof
Look for missing shingles or weak spots where snow and ice could cause leaks.

3. Check Outdoor Vents and Exhaust Pipes
Make sure vents for your furnace, dryer, or water heater are clear of snow and debris to prevent carbon monoxide buildup inside.

4. Add Insulation to Garage Doors
If your garage shares a wall with living space, insulating the door helps maintain indoor warmth.

Conclusion

Knowing how to prepare your home for subzero temperatures can make the difference between a smooth winter and an expensive disaster. Simple steps like insulating pipes, changing filters, and sealing leaks add up to major protection against the cold.

For homeowners in La Crosse, Wisconsin, Niebuhr is your trusted partner for staying warm and worry-free all winter. From furnace maintenance to frozen pipe repair, our team ensures your home stays safe and efficient through even the harshest weather.

Call 608-782-1700 or visit niebuhrplumbing.com/contact to schedule your winter service today.