3.5 Ton 15 SEER 96% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This Goodman system excels for homeowners in moderate climates wanting dependable heating and cooling without premium pricing. The 96% AFUE furnace and variable-speed ECM blower deliver solid efficiency gains, though the SEER1 16 rating suggests the cooling side slightly outperforms typical market alternatives.

Review

The Goodman 3.5 Ton upflow gas furnace and air conditioner system represents solid mid-market equipment for residential HVAC replacement. Positioned as an Energy Star alternative to premium brands, this unit balances efficiency, reliability, and affordability without cutting corners on core components. The dual-fuel capability and variable-speed blower motor elevate it above basic single-stage alternatives, making it relevant for contractors specifying equipment across diverse customer scenarios.

Performance specs tell a strong heating story. The furnace delivers 100,000 BTU input with 96% AFUE efficiency, translating to roughly 96,000 BTU of usable heat output. The air conditioning side produces 42,000 BTU cooling capacity at SEER1 16, which is respectable but trails premium competitors. The variable-speed ECM blower reaches 2,000 CFM maximum, distributing conditioned air evenly while maintaining quiet operation at 73 dB. Two-stage burners modulate flame output for comfort without constant on-off cycling.

Pros & Cons

Pros

Furnace efficiency of 96% AFUE significantly reduces heating costs and qualifies for energy rebates in most states
Variable-speed ECM blower motor adjusts automatically for comfort and efficiency, reducing runtime noise to 73 dB
Dual fuel flexibility runs on natural gas or propane, ideal for areas with supply variability
Two-stage burner provides modulating heat output for better temperature control and less cycling
ENERGY STAR certified with AHRI certification number 7368836 confirms tested performance ratings

Cons

SEER1 rating of 16 is competitive but not best-in-class compared to inverter-driven units reaching 18-20 SEER2
Single-stage compressor limits part-load cooling efficiency on moderate days when full capacity isn't needed
Product specifications show conflicting tonnage data (title states 3.5 ton but specs list 5 ton) creating selection confusion

Who Should Buy

Best For

Contractors and homeowners in mixed climates where both heating and cooling matter equally benefit most from this system. The high AFUE makes it especially attractive for areas with harsh winters and moderate summers, where heating runtime justifies the efficiency investment.

Consider Alternatives If

Buyers in hot-climate regions should evaluate higher SEER2 units with variable-capacity compressors, since the single-stage design won't optimize for extended cooling seasons. Those seeking absolute minimum operating costs should compare inverter-driven systems despite higher upfront cost.

3.5 Ton 15 SEER 96% AFUE 100,000 BTU Goodman Gas F

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Installation

Installation complexity is moderate. The upflow A-coil configuration suits traditional basement or utility closet placement. Suction line requires 1 1/8 inch copper with 0.5 inch insulation (50 feet included), liquid line uses 3/8 inch. PVC exhaust flue is mandatory, which simplifies venting compared to metal alternatives. Electrical demands 115V single-phase 60 Hz with breaker sizing between 23.5 and 40 amps, fitting standard residential panels without upgrades.

Warranty & Reliability

Goodman provides 10-year parts coverage with online registration, which is industry standard for mid-tier equipment. This warranty covers compressor, heat exchanger, and coil defects. Real-world reliability typically ranges 15-20 years for furnaces and 10-15 for air conditioning components. Registration is mandatory to activate coverage, so documentation matters from installation day forward.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	42,000
Heating BTU	100,000
Refrigerant	R410A or R22
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	CAPF Installation Manual CAPF 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	7368836
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Product Features	Rebate Available
Furnace Efficiency / AFUE	96%
Blower Motor	Variable Speed - ECM
Maximum CFM	2000
Configuration	Upflow / Downflow
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

What's the actual difference between SEER1 16 and competitor SEER2 ratings I see advertised? +

SEER1 and SEER2 use different testing standards. SEER1 16 roughly equals SEER2 13-14. This unit's cooling efficiency is solid but not cutting-edge. Higher-efficiency competitors reach SEER2 18-20 by using variable-capacity compressors that better match light cooling loads on mild days.

Can I install this in an attic or horizontal position instead of upflow? +

The spec sheet lists both upflow and downflow configuration options. However, confirm exact model capability with installation manual before purchasing. Horizontal attic installation typically requires different coil orientation and drainage setup than the standard upflow A-coil shown here.

Why does the product title say 3.5 ton but specifications list 5 ton? +

This is a critical inconsistency in vendor data. The cooling capacity of 42,000 BTU converts to 3.5 tons of cooling (12,000 BTU per ton). Verify SKU LS381183850 specs directly with Goodman or the distributor before ordering to confirm actual tonnage for your home's load calculation.

How does this dual-fuel system compare to air-source heat pumps for heating efficiency? +

This gas furnace achieves 96% AFUE in heating. Modern heat pumps reach 300-400% COP (coefficient of performance) in moderate climates but drop in extreme cold. For homes below freezing regularly, this gas system is more reliable. Heat pumps excel above 30°F and cost less monthly in mild climates.

What happens to my warranty if I use R22 refrigerant instead of R410A? +

The system accepts both R22 and R410A refrigerants, though R22 is being phased out. Warranty terms should remain valid either way, but verify with Goodman's evaporator coil warranty documentation included with purchase. Older R22-compatible equipment may face future servicing cost increases as the refrigerant becomes scarcer.

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