Goodman 3.5 Ton 14 SEER 80% 120,000 BTU Furnace & AC System - R410A Upflow Review 2026

// Bottom Line

This Goodman system works best for budget-conscious homeowners in moderate climates who need reliable heating and cooling without premium pricing. The 80% AFUE furnace and 16 SEER1 AC unit deliver respectable efficiency for the cost, though you're trading some features for that lower price point.

Review

The Goodman 3.5-ton 80% AFUE furnace and AC system represents the entry-level value tier in residential HVAC. Positioned as an accessible option for cost-conscious homeowners and contractors managing tight budgets, this combo delivers functional heating and cooling without premium features. Online Supply backs it with a 10-year warranty on parts, adding some peace of mind to the base-model appeal.

Performance specs show 120,000 BTU heating output at 80% efficiency and 42,000 BTU cooling capacity with a 16 SEER1 rating. The scroll compressor and multi-speed PSC blower provide dependable operation across typical residential loads. However, the single-stage design runs at full capacity or off, limiting efficiency in mild weather when partial load would suffice. Noise output of 73 dB during operation is moderately loud for closer installation locations.

Pros & Cons

Pros

16 SEER1 rating on AC side exceeds the stated 14 SEER in marketing, delivering solid cooling efficiency
80% AFUE furnace meets minimum standards and qualifies for ENERGY STAR, reducing heating costs moderately
Scroll compressor is proven reliable technology with fewer moving parts than reciprocating designs
Multi-speed PSC blower motor provides flexible airflow up to 2000 CFM for various ductwork configurations
Single-stage operation keeps mechanical complexity low, reducing potential failure points

Cons

80% AFUE is entry-level efficiency, meaning higher heating bills compared to 95%+ modulating furnaces
Single-stage cooling and heating means no variable capacity, running full-blast or off with no in-between
73 dB noise level is noticeably loud, comparable to heavy traffic, potentially disruptive in quiet spaces
No mention of sound blankets or acoustic insulation, limiting noise reduction options
Spec sheet shows conflicting tonnage claims: title says 3.5 ton but specs list 5 ton, creating confusion

Who Should Buy

Best For

Homeowners replacing older systems in moderate climates where heating isn't extreme and cooling demands are typical. This works especially well for budget renovations where you need a functional split system fast without spending on premium modulation or variable-speed components.

Consider Alternatives If

Skip this if you live in cold climates needing high-efficiency heating, run your system nearly year-round, or value quiet operation. High-efficiency seekers should explore 95%+ AFUE furnaces and variable-speed compressors instead.

Goodman 3.5 Ton 14 SEER 80% 120,000 BTU Furnace &

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Installation

Installation requires a gas line connection for the 120,000 BTU burner and 120V single-phase 60 Hz electrical supply with 22.4 to 35 amp breaker capacity. Ductwork must handle up to 2000 CFM airflow. The upflow/horizontal A-coil configuration fits standard closets and utility spaces at 30 by 24.5 by 21 inches. Refrigerant line sizing uses 3/8-inch liquid and 7/8-inch suction connections with 1/2-inch insulation on a 50-foot maximum length.

Warranty & Reliability

Goodman provides 10 years parts coverage with online registration, a solid commitment for this price tier. The evaporator coil carries separate extended warranty protection. This covers compressor failures and refrigerant leaks during the decade-long window, though labor costs remain your responsibility. Registration is mandatory to activate the full benefit.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	42,000
Heating BTU	120,000
Refrigerant	R410A or R22
Electrical	120 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	73
Weight (in lbs)	48.000000
Feature	Spec
Product Features	Rebate Available
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	35 amps
Min. Breaker Size	22.4 amps
Tonnage	5 Ton
Valve Type	Sweat
Height	30"
Width	24.5"
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	Metal
Furnace Efficiency / AFUE	80%
Blower Motor	Multi Speed - PSC
Maximum CFM	2000
Configuration	Upflow / Downflow
Flue Location	Top
Burner Stages	Single
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

Why does the spec sheet say 5 ton when the title says 3.5 ton? +

This appears to be a data entry error on the product listing. The title indicates 3.5 ton capacity, which aligns with 42,000 BTU cooling. The 5-ton reference in specs is likely a system misconfiguration. Verify tonnage directly with Online Supply before purchasing to confirm actual cooling capacity matches your home's load calculation.

Can I install this system myself if I'm handy? +

Not recommended. You need EPA certification to handle R410A refrigerant legally, plus gas line work typically requires licensed plumbers in most jurisdictions. Furnace installation involves precise combustion testing and safety checks. Professional installation protects your warranty and ensures proper operation. Expect $1,500 to $2,500 in labor costs.

How does 80% AFUE compare to newer furnaces? +

80% AFUE means 20% of fuel energy escapes unused through the exhaust, typical of older designs. Modern modulating furnaces reach 95% to 98%, reducing heating costs by 15 to 20% annually. This 80% unit saves money upfront but costs more to operate over time, making it best for mild climates with shorter heating seasons.

Is 16 SEER1 good cooling efficiency for the price? +

Yes, 16 SEER1 exceeds standard expectations for budget systems and qualifies as ENERGY STAR certified. However, higher-end units reach 20 to 24 SEER1 with variable compressors, providing greater savings in hot climates. For moderate cooling needs, this rating delivers acceptable efficiency without the premium cost.

What happens after the 10-year warranty expires? +

Coverage ends, so any repairs become your expense. Single-stage scroll compressors typically last 12 to 15 years with proper maintenance, so you get reasonable post-warranty lifespan. Regular filter changes and annual professional tune-ups help extend system life beyond the warranty period.

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