If you live in De Pere, Green Bay, or anywhere in Brown County, your furnace isn’t just another appliance — it’s essential during Northeast Wisconsin winters.
One of the most common questions homeowners ask is: “Should I repair my furnace — or replace it?”
This guide will help you determine the right time to replace your furnace, what warning signs to watch for, and what replacement costs look like in Northeast Wisconsin.
How Long Does a Furnace Last in Wisconsin?
Most gas furnaces last 15–20 years.
In our climate, systems often run 5–6 months per year. Your furnace also moves the air needed for your air conditioning in the Summer. That extended runtime accelerates wear on:
Heat exchangers
Blower motors
Ignition systems
Control boards
If your furnace is 15 years old or older, you should at least start planning for replacement — even if it’s still operating.
7 Signs It May Be Time to Replace Your Furnace
1) Your Furnace Is 15+ Years Old
Efficiency drops over time. Older systems are typically 80% AFUE, while new systems are 95–98% efficient.
That difference can significantly reduce winter heating bills.
2) Frequent or Expensive Repairs
3) Rising Energy Bills
If your heating bills keep climbing but usage hasn’t changed, your furnace may be losing efficiency.
Older heat exchangers and blowers work harder to produce the same heat.
4) Uneven Heating or Cold Rooms
Hot and cold spots can indicate:
Declining blower performance
Improper airflow
Failing internal components
Or Air Leakage and Insulation Problems in the home
New variable-speed systems deliver much more consistent comfort.
5) Loud Noises
Banging, rattling, screeching, or booming ignition noises are not normal — especially in older systems.
6) Cracked Heat Exchanger Concerns
A cracked heat exchanger can potentially leak carbon monoxide.
If this is confirmed, replacement is strongly recommended.
7) You’re Planning to Stay in Your Home Long-Term
If you plan to stay 5+ years, replacing an aging furnace now prevents emergency breakdowns when it's coldest when availability is lowest and costs are highest.
How Much Does Furnace Replacement Cost in Northeast Wisconsin?
In De Pere, Green Bay, and Brown County, high-efficiency furnace replacement typically ranges:
Factors that affect cost:
Furnace size (BTUs)
Efficiency rating (AFUE)
Venting modifications
Ductwork adjustments
Indoor air quality add-ons
Thermostat upgrades
Benefits of Replacing Your Furnace
- Lower monthly heating costs
- More even comfort throughout your home
- Quieter operation
- Better humidity control
- Improved indoor air quality
- Manufacturer warranty protection
- Increased home resale value
Schedule Your Furnace Evaluation
If your furnace is 15+ years old or showing signs of decline, now is the time to plan.
Serving homeowners in:
De Pere
Green Bay
Howard
Bellevue
Brown County, Outagamie County, and Northeast Wisconsin