3.5 Ton 14 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 seeking reliable heating and cooling without premium pricing. The 96% AFUE furnace and 16 SEER condenser make it practical for those balancing efficiency gains against installation costs, though single-stage cooling limits peak efficiency on extreme heat days.

Review

The Goodman 3.5 Ton system represents a solid mid-range option for homeowners seeking dependable HVAC performance. This upflow configuration combines a gas furnace with an air conditioning condenser, making it suitable for homes without existing split-system installations. The Energy Star certification signals manufacturer commitment to efficiency standards, and the Goodman brand maintains reasonable recognition among contractors for parts availability and service support.

The heating side delivers impressive performance with a 96% AFUE rating and 100,000 BTU output, translating to minimal wasted fuel during winter months. The cooling condenser rates at 16 SEER1 efficiency on a 42,000 BTU capacity, exceeding typical industry minimums. The multi-speed ECM blower motor adjusts from 0 to 1600 CFM, allowing seasonal optimization. Two-stage burners modulate heat output rather than simple on-off cycling, reducing temperature swings and energy consumption.

Pros & Cons

Pros

96% AFUE furnace rating delivers excellent heating efficiency, recovering nearly all fuel energy
16 SEER1 rating on the 3.5 ton condenser exceeds the stated 14 SEER specification
Multi-speed ECM blower motor allows airflow optimization from 0 to 1600 CFM across seasons
Two-stage burner provides modulating heat output for more consistent comfort and lower energy waste
Energy Star certified with 10-year warranty when registered, covering major components

Cons

Single-stage compressor limits cooling efficiency during peak summer demand periods
73 dB noise level runs slightly above quieter variable-speed alternatives in cooling mode
Spec discrepancy shows 3.5 ton in product title but 5 ton in unit specifications, creating confusion

Who Should Buy

Best For

Homeowners in moderate climates looking for a balanced, efficient system without variable-speed pricing. This works well for those replacing older equipment and wanting Energy Star performance with straightforward two-stage heating.

Consider Alternatives If

Anyone in extreme climates or seeking minimal noise operation should explore variable-capacity or dual-stage compressor models, which handle temperature swings more efficiently.

3.5 Ton 14 SEER 96% AFUE 100,000 BTU Goodman Gas F

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Installation

This upflow unit requires standard gas line connections, 115V single-phase 60Hz electrical service, and a 23.5 to 40 amp breaker. The A-coil design fits standard return air plenums efficiently. PVC plastic exhaust flue venting simplifies installation compared to metal alternatives. Dimensions of 30 inches tall, 21 inches wide, and 21 inches deep fit most utility closets and basement locations. Refrigerant line sizing uses 3/8 inch liquid and 7/8 inch suction connections with 1/2 inch insulation thickness.

Warranty & Reliability

Goodman provides a 10-year comprehensive warranty on all components when you register the unit online after installation. This covers compressor, evaporator coil, and furnace components against manufacturing defects. Registration typically takes minutes through Goodman's website. This duration matches competitor offerings at this price point and provides meaningful protection during the system's peak usage years.

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.
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Furnace Efficiency / AFUE	96%
Blower Motor	Multi-Speed - ECM
Maximum CFM	1600
Configuration	Upflow / Downflow
Flue Location	Right
Burner Stages	Two
Fuel Type	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 difference between 14 SEER and 16 SEER1 mentioned in the specs? +

SEER1 is the updated testing standard that typically shows slightly higher numbers than older SEER ratings under identical conditions. This unit's actual 16 SEER1 performance exceeds its 14 SEER title specification, meaning real-world cooling efficiency performs better than advertised. Always check which standard applies when comparing systems.

Can this system work in both upflow and downflow installations? +

Yes, the configuration field shows upflow/downflow capability, providing installation flexibility. However, your application determines which orientation works best. Upflow suits basements and utility closets, while downflow works for attic installations. Your contractor should confirm airflow direction matches your home's existing ductwork.

Is 73 dB noise level loud compared to other systems? +

At 73 dB, this system runs slightly louder than variable-speed units, equivalent to a typical conversation. Single-stage compressors generate more noise than multi-stage alternatives. For reference, most home HVAC systems range from 70 to 80 dB. If quiet operation matters, request sound-dampened models during comparison shopping.

How does the two-stage furnace heating compare to single-stage models? +

Two-stage burners run at reduced capacity for normal heating, firing full capacity only during extreme cold. This minimizes temperature swings, improves comfort, and reduces gas consumption during mild winters. Single-stage units simply turn on and off, creating more variability and wasting fuel through overshooting temperature targets.

Does the 10-year warranty require annual maintenance? +

Most manufacturers require professional maintenance annually to preserve warranty validity. Check Goodman's warranty documentation after registration. Typical coverage includes filter changes, refrigerant checks, and combustion analysis. Skipping maintenance can void coverage, so budget for professional service yearly.

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