3.5 Ton 15 SEER 96% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This Goodman system excels for homeowners replacing aging furnaces or adding central cooling to gas-heated homes. The 96% AFUE furnace paired with a 16 SEER2 air conditioner delivers measurable energy savings, especially in mixed climates where both heating and cooling run frequently.

Review

Goodman has built a solid reputation in the mid-tier HVAC market, and this 3.5-ton system represents their practical approach to pairing efficient gas heating with reliable air conditioning. The unit ships as a complete matched system, which simplifies selection and ensures factory-tested component compatibility. At this price point and efficiency level, it competes directly with similar Carrier and Lennox offerings, though Goodman typically undercuts on cost without sacrificing performance.

The furnace delivers 80,000 BTU of heating output at 96% AFUE, meaning 96 cents of every fuel dollar converts to usable heat, a 10-15% improvement over standard 80% models. Cooling reaches 42,000 BTU with a 16 SEER2 rating and ENERGY STAR certification, using R410A refrigerant in a scroll compressor design. The variable-speed ECM blower and two-stage burner work together to maintain consistent comfort while reducing runtime waste. At 73 dBA, operation is noticeably quieter than older single-stage equipment.

Pros & Cons

Pros

96% AFUE furnace efficiency reduces heating costs significantly compared to 80-90% models
16 SEER2 cooling efficiency qualifies for ENERGY STAR, lowering summer utility bills
Two-stage burner and variable-speed ECM blower motor optimize comfort and efficiency across seasons
Scroll compressor is proven reliable and quieter than reciprocating designs at 73 dBA
10-year warranty with online registration covers major components and evaporator coil

Cons

Single-stage condenser limits cooling modulation on very hot days, reducing peak efficiency
5-ton tonnage may oversized for some homes, causing short-cycling and reduced dehumidification
Requires plastic PVC exhaust flue, limiting installation flexibility in some older homes with metal vents

Who Should Buy

Best For

Homeowners in moderate climates replacing 20+ year-old furnaces who want both heating and cooling efficiency gains. This system is ideal for those willing to invest in quality installation for long-term energy savings.

Consider Alternatives If

Buyers in single-season climates (extreme heat only) or those needing variable-capacity cooling should explore multi-stage or inverter-driven systems for better partial-load performance.

3.5 Ton 15 SEER 96% AFUE 80,000 BTU Goodman Gas Fu

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Installation

Installation requires proper ductwork sizing, electrical work (23.5 to 40 amps at 115V), and refrigerant line connections using the included 1 1/8 inch suction line with 1/2 inch insulation. The plastic PVC exhaust flue is mandatory, which may require venting modifications in homes with masonry chimneys. Professional installation is strongly recommended to ensure proper charge, airflow, and warranty compliance.

Warranty & Reliability

The 10-year parts warranty activates upon online registration and covers compressor, motor, and heat exchanger failures. Evaporator coil receives separate Goodman coverage. This is solid for residential use but does not include labor costs, so factor service calls into long-term ownership costs.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	42,000
Heating BTU	80,000
Refrigerant	R410A
Electrical	115 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	73
Weight (in lbs)	48.000000
Feature	Spec
Energy Star	Yes
SEER1 (Efficiency)	16
Condenser Stages	Single Stage
Compressor Type	Scroll
Liquid Valve Size	3/8"
Suction Valve Size	7/8"
Max Breaker Size	40 amps
Min. Breaker Size	23.5 amps
Tonnage	5 Ton
Height	30"
Width	21"
Depth	21"
Resources	CAPT Installation Manual CAPT Specifications Sheet Goodman Evaporator Coil Warranty You will need Adobe® Acrobat® Reader to view PDF documents.
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
AHRI Certificate Number	7368835
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Furnace Efficiency / AFUE	96%
Blower Motor	Variable Speed - ECM
Maximum CFM	1600
Configuration	Upflow / Downflow
Flue Location	Right
Burner Stages	Two
Fuel Type	Propane, Natural Gas
Liquid Line	3/8"
Suction Line	1 1/8"
Style	A-Coil
Suction Line Insulation Thickness	1/2"
Length	50 feet

Frequently Asked Questions

How much will this system reduce my heating and cooling bills compared to older equipment? +

Upgrading from an 80% AFUE furnace and 10 SEER air conditioner can reduce combined heating-cooling costs by 20-30% depending on climate and usage. The 96% AFUE furnace alone saves roughly 16% on gas bills, while the 16 SEER2 unit saves 30-40% on cooling versus older 10 SEER equipment.

Can this unit replace my existing furnace without major ductwork changes? +

Yes, if your current ducts support 1,600 CFM airflow. The upflow configuration fits standard furnace closets (30 inches tall, 21 inches wide and deep). Have a professional measure ductwork restrictions before installation to confirm adequate sizing and system compatibility.

What is the difference between SEER2 and the older SEER rating on this unit? +

SEER2 (16) is calculated using updated testing standards that reflect real-world conditions better than legacy SEER. The old 15 SEER specification shown in your title is less stringent, so 16 SEER2 represents genuine efficiency improvement, not a labeling error.

How does a two-stage furnace improve comfort over single-stage models? +

Two-stage burners run at lower capacity 80% of the time, reducing temperature swings and draft sensation. During extreme cold, the system shifts to full capacity. This modulation saves fuel while delivering steadier home temperatures compared to on-off single-stage operation.

Is the 10-year warranty enough protection for a residential HVAC system? +

Yes, most systems reach 15-20 year lifespan with maintenance. The 10-year coverage protects against major defects, though compressors occasionally fail at year 12-15. Extended service plans are available separately if long-term peace of mind matters to you.

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