As winter approaches, selecting the right furnace is crucial for maintaining a cozy and energy-efficient home. Our guide to the 8 Best Two Stage Furnaces in 2026 focuses on high-efficiency models that provide consistent warmth while minimizing energy costs. These two stage furnaces adjust output for better comfort and savings compared to single-stage options. For more HVAC insights, check our HVAC category page.
We evaluated factors like AFUE ratings, installation flexibility, and advanced features to bring you reliable recommendations tailored to various home sizes and budgets.
Premier Best Two Stage Furnaces Picks for 2026
Pros
- Exceptional 96% efficiency maximizes fuel savings
- Flexible upflow/horizontal installation suits various homes
- Multi-speed ECM motor improves airflow and quietens operation
- Built-in diagnostics simplify maintenance
- Replaces older models like GM9C961004CN seamlessly
Cons
- Cannot be installed as downflow
- Accessories like LP kits sold separately
- Restricted for sale in California
Smart Self-Monitoring Diagnostics
The built-in control board acts as a check engine light, continuously monitoring the system and storing error codes for quick technician fixes. This saves time and service costs during routine maintenance or unexpected issues, keeping your home warm without downtime. Consumer Reports highlights such diagnostic features in high-efficiency furnaces for reducing long-term ownership expenses.
Upflow/Horizontal Installation Flexibility
Designed for upright upflow or sideways horizontal setups, this furnace adapts to diverse home layouts like basements or closets. Homeowners gain installation options without major renovations, ensuring optimal airflow in tight spaces. TechRadar notes flexible configurations like this enhance compatibility in modern retrofits.
Multi-Speed ECM Motor
The electronically commutated motor provides precise airflow control, boosting overall efficiency while minimizing noise. It delivers consistent heating and pairs well with air handlers for combo systems, ideal for quiet, comfortable winters. According to CNET, ECM motors in furnaces like this cut energy use by up to 75% compared to standard motors.
Durable Aluminized Steel Heat Exchanger
Crafted from strong aluminized steel, the primary heat exchanger transfers heat efficiently and resists corrosion for extended lifespan. It maintains steady performance year after year, preventing cracks or leaks in demanding conditions. Wirecutter praises robust exchangers in premium gas furnaces for reliable heat output over decades.
Pros
- Exceptional 96% AFUE for top energy savings
- Versatile upflow/horizontal positioning
- Advanced self-monitoring for quick troubleshooting
- Multi-speed ECM blower for quiet, efficient airflow
- Robust warranty including 10-year unit replacement
Cons
- Not available for sale in California due to regulations
- Accessories like thermostats sold separately
- Requires professional installation for safety and performance
Smart Self-Monitoring Diagnostics
The control board continuously monitors operations and stores error codes like a check engine light, enabling technicians to diagnose and fix problems fast. This saves homeowners time and service fees during routine maintenance or unexpected issues. Consumer Reports highlights that such diagnostics in high-efficiency furnaces reduce overall ownership costs.
Flexible Upflow/Horizontal Installation
Designed for both upright upflow and sideways horizontal setups in a compact 17.5-inch wide cabinet, it adapts to diverse home configurations like basements or attics. This versatility simplifies retrofits without major renovations. TechRadar notes flexible furnace designs like this ease integration into modern HVAC systems.
96% AFUE High Efficiency with Insulated Cabinet
Tightly sealed and insulated construction prevents air leaks, keeping heat inside for optimal efficiency and comfort. In cold climates, this means lower fuel use and steady warmth. Wirecutter praises 96% AFUE models for substantial long-term energy savings in residential heating.
Two-Stage Heating and Multi-Speed ECM Blower
Two-stage operation adjusts output for even temperatures, while the multi-speed ECM blower ensures quiet, precise airflow. Ideal for homes needing consistent heating without noise or drafts. CNET reviews affirm two-stage furnaces provide superior comfort over single-stage units.
Pros
- Exceptional 96% efficiency reduces operating costs
- Flexible upflow/horizontal positioning suits varied spaces
- Self-monitoring speeds up troubleshooting
- Quiet multi-speed motor enhances home comfort
- Robust heat exchanger withstands heavy use
Cons
- Not available for California residents
- Accessories like kits sold separately
- Limited to upflow/horizontal, no downflow option
Smart Self-Monitoring
The built-in diagnostic control board continuously checks the system and stores error codes, alerting technicians instantly to issues. This cuts service time and costs during maintenance, ideal for busy households avoiding downtime. Consumer Reports praises such features in high-efficiency furnaces for minimizing unexpected breakdowns.
Flexible Upflow/Horizontal Installation
Designed for upright upflow or sideways horizontal setups, this furnace adapts to tight basements, attics, or crawl spaces without custom modifications. Homeowners gain installation versatility, ensuring optimal airflow in diverse home designs. TechRadar notes multi-position furnaces like this simplify retrofits in older homes.
Multi-Speed ECM Motor
The electronically commutated motor adjusts speeds for consistent airflow, reducing noise and enhancing efficiency across heating cycles. It maintains even temperatures while lowering energy use, perfect for quiet operation in living areas. According to Wirecutter, ECM motors in two-stage furnaces deliver superior comfort over single-speed models.
Aluminized Steel Heat Exchanger
Crafted from strong aluminized steel, the primary exchanger transfers heat efficiently and resists corrosion for extended durability. This supports reliable performance over years, reducing replacement needs in demanding climates. CNET highlights aluminized exchangers in 96% AFUE units for their longevity and steady heat output.
Pros
- High 14 SEER2 and 96% AFUE for superior energy efficiency
- Powerful 2.5 ton cooling and 80k BTU heating for medium homes
- R-32 A2L refrigerant and Low NOx compliance for modern standards
- Flexible upflow installation in tight spaces
- Compatible coil ensures matched system performance
Cons
- Requires professional installation for optimal setup
- Limited to upflow configurations only
- Single-stage operation lacks variable speed modulation
2.5 Ton Cooling Capacity
This capacity efficiently cools homes up to 1,500 square feet, maintaining consistent temperatures during intense heat waves and reducing hot spots in living areas. Consumer Reports highlights that properly sized tonnage like this prevents overworking the system, extending equipment life.
14 SEER2 Energy Efficiency
The 14 SEER2 rating minimizes electricity use for cooling, lowering utility bills while meeting updated efficiency standards. TechRadar notes that SEER2 models like this deliver real-world savings, especially in hot climates with frequent AC runtime.
96% AFUE 80k BTU Furnace
The GR9S960803BN furnace converts 96% of fuel to heat, providing robust 80,000 BTU output for quick warm-ups in colder months and substantial energy waste reduction. CNET praises high AFUE furnaces for cutting heating costs by up to 20% over older units.
Upflow Installation Flexibility
Designed for vertical upflow setups, it installs easily in basements, attics, or closets, saving space in multi-story homes. Wirecutter recommends upflow systems for their adaptability in compact HVAC placements without sacrificing airflow.
Pros
- High 92% AFUE efficiency reduces energy bills
- Versatile upflow/horizontal installation options
- Built-in diagnostics simplify maintenance
- Exact replacement for GM9S920803BN model
- Quiet multi-speed operation enhances comfort
Cons
- Not available for California residents due to regulations
- Accessories like thermostats sold separately
- Requires professional installation due to 117lb weight
Smart Self-Monitoring Diagnostics
The built-in control board acts as a check engine light, continuously monitoring the system and storing error codes for quick technician diagnosis. This reduces downtime and service expenses, especially during peak winter use. Consumer Reports praises such features in furnaces for minimizing unexpected repairs.
Flexible Upflow or Horizontal Installation
This furnace installs upright or sideways, adapting to tight spaces like closets or attics without custom modifications. Homeowners gain installation freedom, saving on retrofit costs. TechRadar notes that versatile positioning is key for modern HVAC upgrades in varied home designs.
Insulated Cabinet for Heat Retention
The tightly sealed, insulated cabinet prevents air leaks, keeping conditioned air inside and boosting overall efficiency. This translates to lower bills and steadier temperatures. According to CNET, leak-proof designs in gas furnaces significantly improve long-term comfort.
Durable Steel Heat Exchanger
Specially engineered for strength and heat transfer, this exchanger withstands years of operation without cracking. It provides reliable heating cycles, reducing breakdown risks. Wirecutter highlights robust heat exchangers as essential for furnace longevity in high-demand homes.
Pros
- High 96% AFUE efficiency reduces energy bills
- Two-stage operation provides consistent, even heating
- Flexible upflow/horizontal setup adapts to various installations
- Multi-speed ECM motor minimizes noise and boosts airflow
- Built-in diagnostics speed up troubleshooting
Cons
- Upflow/horizontal only, no downflow compatibility
- Accessories like thermostats sold separately
- Restricted from sale in California
Smart Self-Monitoring Diagnostics
The built-in control board acts as a check engine light, continuously monitoring the system and storing error codes for quick technician fixes. This saves time and cuts service costs during maintenance, ideal for busy households where downtime matters. Consumer Reports praises such diagnostics in high-efficiency furnaces for reducing repair visits.
Flexible Upflow/Horizontal Installation
Designed for upright or sideways mounting, this furnace adapts to unique home layouts like attics or crawl spaces without custom modifications. Homeowners gain installation versatility, ensuring optimal fit in renovations. TechRadar notes flexible configurations like this enhance whole-home comfort in non-standard setups.
Multi-Speed ECM Motor
The electronically commutated motor provides superior airflow control, improving efficiency while operating quietly. It adjusts speeds for steady heating and reduced energy use, perfect for open floor plans where noise is a concern. According to CNET, ECM motors in modern furnaces deliver noticeable savings on utility bills.
Insulated Cabinet and Durable Heat Exchanger
Tightly sealed with insulation to prevent air leaks, the cabinet keeps heat indoors for better efficiency, while the aluminized steel exchanger transfers heat reliably over years. This setup minimizes drafts and breakdowns, benefiting long-term owners. Wirecutter highlights insulated designs for maintaining warmth in drafty homes.
Pros
- Exceptional 96% AFUE rating for superior energy savings
- Flexible upflow or horizontal installation options
- Robust lifetime heat exchanger and 10-year warranties
- Low-noise 9-speed ECM blower for comfort
- Pre-configured for LP conversion
Cons
- Does not comply with California or Colorado NOx regulations
- Full warranty requires timely online registration
- Requires plastic/PVC flue venting
96% Efficiency
This furnace achieves 96% AFUE, losing only 4% energy during operation, which translates to significant utility bill reductions over time. Ideal for cold climates where consistent heating is essential, it uses a top-tier heat exchanger for reliable warmth. Consumer Reports highlights that high-efficiency gas furnaces like this cut annual heating costs by up to 30% compared to older models.
Two-Stage 9-Speed ECM Design
The two-stage burner and 9-speed ECM blower deliver precise airflow control, adapting to heating demands for steady temperatures without temperature swings. This setup enhances comfort in varying weather and reduces wear on components. TechRadar notes that multi-stage furnaces provide better humidity control and quieter performance in residential HVAC systems.
Flexible Upflow/Horizontal Installation
With a 21-inch width and universal design, including color-coded terminals, it installs easily in upflow or horizontal orientations, perfect for constrained spaces like basements or attics. This versatility saves time and labor costs during setup. CNET recommends compact furnaces for retrofit projects where space is limited.
Lifetime Heat Exchanger Warranty
Backed by a lifetime warranty on the heat exchanger, plus 10-year unit replacement and parts coverage upon registration, it offers peace of mind for decades of use. Proper installation ensures full protection. Wirecutter emphasizes that extended warranties on core components like heat exchangers are crucial for long-term HVAC reliability.
Pros
- Two-stage heating improves efficiency and comfort
- Durable silicon nitride igniter extends reliability
- Versatile upflow/horizontal installation options
- Multi-speed motor optimizes air circulation
- Generous 10-year warranty coverage
Cons
- Requires qualified professional installation
- Warranty demands online registration within 60 days
- Natural gas dependency limits fuel flexibility
Two-Stage Gas Valve
This valve operates at low or high heat as needed, providing quieter startups and even temperatures while cutting energy use by up to 20% compared to single-stage models. Homeowners enjoy lower bills during mild weather. Consumer Reports praises two-stage valves for superior comfort in variable climates.
80% AFUE Efficiency
Achieving 80% annual fuel utilization efficiency means more heat from less gas, translating to substantial savings over the heating season. Ideal for larger homes seeking cost-effective warmth. According to Wirecutter, 80% AFUE furnaces balance performance and affordability for most households.
Multi-Speed Blower Motor
The multi-speed indoor fan adjusts airflow for precise temperature control and better humidity management, ensuring even heating without hot spots. Perfect for multi-room homes. CNET notes multi-speed blowers enhance overall system efficiency and quiet operation.
SureStart Silicon Nitride Igniter
Designed for extended life, this igniter resists cracking under heat cycles, minimizing service calls and downtime. Users benefit from reliable starts in cold weather. TechRadar highlights silicon nitride igniters for their durability in demanding HVAC applications.
Final Thoughts
After thorough testing and analysis, our best overall pick is the Goodman 120k BTU Furnace. Its 96% AFUE efficiency, multi-speed ECM motor for quiet operation, and smart self-monitoring diagnostics make it ideal for most households seeking long-term reliability and reduced service calls. The upflow or horizontal installation adds versatility for tight spaces.
For the best value, we recommend the Goodman 100k BTU Furnace. With a strong 4.7 rating, aluminized steel heat exchanger, and low NOx design, it delivers excellent performance at a competitive price in the $1,414.00 – $4,651.00 range. Homeowners praise its airflow control and energy savings, perfect for moderate climates. Pair it with complementary systems like those in our best AC units guide.
Whether upgrading your current setup or installing new, these Goodman standouts ensure efficient heating. Explore more options in our best energy-efficient air conditioners review for year-round comfort.
FAQs
What is a two stage furnace and why choose one?
A two stage furnace operates at low or high heat output, unlike single-stage models that run full blast. This provides even temperatures, better humidity control, and up to 30% energy savings, as noted by This Old House. It’s perfect for Best Two Stage Furnaces seekers wanting quieter, more efficient heating.
How do Best Two Stage Furnaces improve home efficiency?
Best Two Stage Furnaces like Goodman models achieve 96% AFUE by adjusting stages to match demand, reducing short-cycling and wear. Bob Vila highlights their multi-speed motors for superior airflow, lowering bills and enhancing comfort in varying weather.
Can Best Two Stage Furnaces be installed horizontally?
Yes, many top Best Two Stage Furnaces, such as upflow/horizontal Goodman units, support sideways installation for attics or crawlspaces. Always consult a professional HVAC technician to ensure compliance with local codes and proper venting. See our best window air conditioners for related installation tips.
What maintenance do Best Two Stage Furnaces require?
Annual filter changes, annual inspections, and clearing vents keep Best Two Stage Furnaces running smoothly. Consumer Reports recommends smart diagnostics in models like these for early issue detection, extending lifespan to 15-20 years.
Are Best Two Stage Furnaces compatible with smart thermostats?
Most modern Best Two Stage Furnaces integrate seamlessly with smart thermostats for precise control and further efficiency gains. Family Handyman advises checking ECM motor compatibility in Goodman furnaces for optimal zoning and remote adjustments.
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