Replacing a furnace is one of the larger home investments a Metro Detroit homeowner makes — and one of the most important. Get it right, and you’ll have reliable, efficient heat for the next 15–20 years. Get it wrong, and you’ll be dealing with comfort problems, high energy bills, and premature repairs. Cregger has installed and replaced furnaces across Southeast Michigan since 1993. This guide covers everything you need to know to make a confident decision in 2026.
When Is It Time to Replace a Furnace?
Furnaces don’t usually fail all at once. They decline gradually, giving homeowners signals along the way. Here are the clearest signs that replacement makes more sense than continued repair:
- Age over 15–18 years: Most gas furnaces last 15–20 years with proper maintenance. Once a system passes the 15-year mark, the cost-benefit of repairs shifts significantly.
- Frequent repair calls: If you’ve called for furnace service two or more times in a single season, the system is telling you something. Recurring repairs are rarely isolated incidents.
- Rising heating bills without explanation: A furnace losing efficiency burns more gas to deliver the same heat. If your winter gas bills are climbing year over year without changes in usage, the furnace is likely the reason.
- Uneven heat throughout the home: Cold rooms, warm rooms, and constant thermostat adjustments point to a system that can no longer distribute heat effectively.
- A cracked heat exchanger: This is a safety issue, not just a performance issue. Once confirmed, replacement is almost always the only responsible option.
- The system uses R-22 refrigerant or other discontinued components: Aging systems that rely on parts no longer manufactured create increasing repair costs and availability problems.
Types of Furnaces Available in 2026
Cregger installs several types of heating systems for Metro Detroit homes. Understanding the options helps you choose the right fit:
Single-Stage Gas Furnaces
Single-stage furnaces operate at full capacity whenever they run — either fully on or fully off. They’re the most straightforward and least expensive option, but they’re less efficient at maintaining consistent temperatures and tend to produce more temperature swings. Best for homeowners with tighter budgets or smaller homes.
Two-Stage Gas Furnaces
Two-stage furnaces run at a lower capacity (typically 65–70%) most of the time, ramping up to full output only on the coldest days. This delivers more consistent temperatures, better humidity control, quieter operation, and improved efficiency compared to single-stage units. A significant step up in comfort for most Michigan homes.
Variable-Speed (Modulating) Gas Furnaces
Variable-speed furnaces continuously adjust output to match the home’s exact heating demand. They run longer at lower capacities, delivering the most even temperatures, the best humidity control, and the highest efficiency of any gas furnace option. Premium cost upfront, with the lowest operating costs over time. An excellent choice for larger Metro Detroit homes.
Heat Pump and Dual-Fuel Systems
Cold-climate heat pumps have matured significantly and are now a practical primary heating option for Michigan homes. A dual-fuel setup pairs a heat pump with a gas furnace — the heat pump handles most of the heating load efficiently, and the gas furnace kicks in on the coldest days when heat pump efficiency drops. This configuration delivers the best of both technologies and can meaningfully reduce annual heating costs.
AFUE Ratings: What They Mean for Your Gas Bill
AFUE (Annual Fuel Utilization Efficiency) measures how efficiently a furnace converts gas to heat. A 96% AFUE furnace converts 96 cents of every dollar of gas into usable heat. The federal minimum for new furnaces installed in Michigan is 80% AFUE. Here’s how efficiency levels translate to real operating costs:
- 80% AFUE: The minimum standard. Adequate, but leaves 20 cents of every fuel dollar as waste.
- 90–92% AFUE: Mid-efficiency. A meaningful improvement over 80% units, with moderate upfront cost.
- 96–98% AFUE: High-efficiency. These are condensing furnaces with two heat exchangers. The operating cost savings over Michigan’s long heating season are substantial.
Upgrading from an 80% to a 96% AFUE furnace can reduce heating fuel consumption by roughly 17%. Over a Michigan winter, with gas bills that can run $200–$400 per month or more for larger homes, that’s a real number.
Furnace Installation Cost in Metro Detroit for 2026
Furnace installation costs vary based on system type, efficiency rating, home size, and installation complexity. Here are realistic ranges for the Detroit area in 2026:
- Single-stage gas furnace (80% AFUE), installed: $2,500 – $4,000
- Two-stage gas furnace (90–96% AFUE), installed: $3,500 – $5,500
- Variable-speed gas furnace (96–98% AFUE), installed: $4,500 – $7,500
- Cold-climate heat pump (dual-fuel with existing furnace), installed: $5,000 – $10,000+
These ranges include equipment, labor, removal of the old system, and standard installation. Additional costs may apply for flue liner upgrades (often required for high-efficiency condensing furnaces), electrical work, gas line modifications, or ductwork repairs identified during installation.
Cregger provides detailed, itemized quotes before any work begins. There are no surprise add-ons after the job starts.
What the Installation Process Looks Like
A standard furnace replacement with Cregger typically takes four to eight hours for a straightforward swap. Here’s what the process includes:
- Pre-installation assessment: Cregger evaluates your existing system, ductwork condition, flue configuration, and gas line to identify any required modifications before equipment is ordered.
- Equipment selection and sizing: Proper sizing using heating load calculations — not just matching the old system’s capacity — ensures the new furnace is right for your home.
- Removal and disposal of the old system
- Installation of the new furnace, including all connections to gas, flue, electrical, and ductwork
- System startup, testing, and commissioning
- Thermostat programming and homeowner walkthrough
High-efficiency condensing furnaces vent through PVC pipe rather than a traditional flue, which means new venting must be run through a wall or rim joist. This adds some installation complexity but is standard work for Cregger’s installation crews.
Rebates and Incentives Available in Michigan in 2026
Michigan homeowners replacing older furnaces with high-efficiency systems may be eligible for rebates through DTE Energy, Consumers Energy, or federal tax credits under the Inflation Reduction Act. Available incentives vary based on equipment type, efficiency rating, and income qualifications. Cregger can point you toward current programs and help ensure the equipment you choose qualifies.
How to Choose the Right Furnace for Your Metro Detroit Home
The right furnace depends on your home’s size, insulation levels, existing ductwork, and your budget for both upfront cost and long-term operating expenses. A larger, older home with minimal insulation has very different heating requirements than a well-insulated newer build.
Cregger’s approach is to assess your specific home before recommending equipment — not to steer you toward the highest-margin product on the shelf. We’ll explain the performance differences between options, run the numbers on long-term operating costs, and help you make a decision that makes sense for your situation.
Frequently Asked Questions About Furnace Replacement in Detroit
How long does a new furnace installation take? Most standard replacements take four to eight hours. More complex installations involving new venting, ductwork, or gas line work take longer.
What brands does Cregger install? Cregger works with leading brands including Carrier, Lennox, Trane, and Rheem. We’ll recommend the best fit for your home and budget.
Is financing available? Contact Cregger to ask about current financing options for furnace installation and replacement.
Call Cregger in Metro Detroit today to schedule your furnace replacement consultation. We serve Ferndale, Royal Oak, Birmingham, Troy, and communities across Southeast Michigan with expert installation, honest guidance, and workmanship that lasts.
