Goodman 3.5 Ton 14 SEER 80% 100,000 BTU Furnace & AC System - R410A Upflow Review 2026

// Bottom Line

This Goodman system targets cost-conscious homeowners and contractors looking for straightforward, dependable heating and cooling without premium pricing. The 80% AFUE furnace and 16 SEER2 air conditioner deliver respectable efficiency for mid-range applications, making it ideal for replacement jobs or new builds where budget constraints matter.

Review

The Goodman 3.5-ton combo system sits squarely in the value segment of the HVAC market, priced at $647 for the complete condensing unit. This upflow A-coil configuration targets replacement installations and new construction projects where contractors need reliable equipment without luxury pricing. Online Supply's offering includes a 10-year parts warranty with registration, positioning it as practical middle-ground equipment for homeowners tired of repair bills but unwilling to invest in premium systems.

Performance metrics show the furnace delivers 100,000 BTU heating output at 80% AFUE, while the air conditioner provides 42,000 BTU cooling capacity rated at 16 SEER2 (exceeding the advertised 14 SEER). The scroll compressor uses R410A refrigerant in a single-stage configuration, meaning it runs full capacity or off with no intermediate efficiency benefits. Electrical requirements are reasonable at 120V single-phase with 22.4-35 amp breaker compatibility, fitting standard residential panels without upgrades.

Pros & Cons

Pros

16 SEER2 rating exceeds the product title's 14 SEER claim, delivering better cooling efficiency than advertised
100,000 BTU furnace with 80% AFUE provides reliable heating for most single-family homes in moderate climates
42,000 BTU cooling capacity handles 3.5-ton cooling load appropriately for 1,400-1,600 sq ft homes
Multi-speed PSC blower motor with 2000 CFM maximum airflow ensures consistent temperature distribution
Energy Star certified and qualifies for manufacturer rebates, reducing total installed cost

Cons

Single-stage compressor and single-stage burner lack the efficiency gains of two-stage systems in mild weather
73 dB noise level is louder than premium variable-speed alternatives, noticeable during operation
80% AFUE is baseline modern efficiency, not cutting-edge for furnaces approaching higher AFUE ratings

Who Should Buy

Best For

Homeowners replacing aging 10-15 year old systems on a budget, or contractors completing spec jobs where upfront cost drives selection. This system works well for homes under 1,600 square feet in moderate heating/cooling climates where basic reliability matters more than advanced features.

Consider Alternatives If

Anyone in severe heating climates should explore 90%+ AFUE furnaces; those seeking whisper-quiet operation or maximum efficiency should consider variable-stage competitors costing $1,000-1,500 more.

Goodman 3.5 Ton 14 SEER 80% 100,000 BTU Furnace &

$647

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Installation

Installation requires standard line-set connections using 3/8 inch liquid lines and 1 1/8 inch suction lines with 1/2 inch insulation. The unit needs a metal exhaust flue exiting through the top and proper upflow positioning in conditioned spaces. Weight of 48 pounds and dimensions of 34.5 inches high by 21 inches wide by 28.75 inches deep fit typical basement or utility closet installations without special modifications.

Warranty & Reliability

The 10-year comprehensive parts warranty activates only through online registration with Goodman, covering manufacturing defects in compressor, coils, and electrical components. Labor and refrigerant are excluded, meaning homeowners pay service calls independently. This warranty matches industry standard for mid-tier equipment and provides meaningful protection against premature failures without premium-tier lifetime component coverage.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	42,000
Heating BTU	100,000
Refrigerant	R410A
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	3.5 Ton
Valve Type	Sweat
Height	34.5"
Width	21"
Depth	28.75"
Resources	Goodman Brochure Goodman Installation Manual Goodman Parts Manual Goodman Service Manual Goodman Specifications Goodman Technical Information Goodman User Information You will need AdobeÂ® AcrobatÂ® 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.
Configuration	Upflow/Horizontal
Liquid Line	3/8"
Suction Line	1 1/8"
Style	A-Coil
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Metal
Furnace Efficiency / AFUE	80%
Blower Motor	Multi Speed - PSC
Maximum CFM	2000
Flue Location	Top
Burner Stages	Single
Fuel Type	Gas
Suction Line Insulation Thickness	1/2"
Length	50 feet

Frequently Asked Questions

Why does the specs show 16 SEER2 when the product title claims 14 SEER? +

The 16 SEER2 rating reflects current testing standards, while 14 SEER refers to older SEER methodology. SEER2 is approximately 15-20% lower than SEER numerically, so 16 SEER2 roughly equals 18-19 SEER old standard. This unit actually performs better than the conservative product title suggests.

Can I install this myself, or do I need a licensed contractor? +

Most jurisdictions require licensed HVAC technicians for refrigerant handling and gas furnace installations due to safety codes and warranty compliance. DIY installation voids the warranty and creates potential safety hazards. Expect professional installation costs of $1,500-2,500 depending on local labor rates.

How does the 80% AFUE compare to newer furnace options? +

80% AFUE is adequate but modest by current standards. High-efficiency condensing furnaces reach 90-95% AFUE, reducing fuel consumption by 10-15% annually. Upgrade costs $500-800 more per unit but recover through lower heating bills over 10-15 years in cold climates.

Is single-stage cooling adequate for my home, or should I buy two-stage? +

Single-stage works fine for consistent climates where outdoor temperatures don't fluctuate dramatically. Two-stage systems run at lower capacity during mild weather, saving 20-30% in partial-load scenarios. Payback requires 8-12 years in moderate climates; prioritize single-stage for cold regions needing maximum capacity.

What does the 10-year warranty actually cover if something fails? +

Parts only. Compressor burnout, coil leaks, and electrical components are covered after registration. Labor calls, refrigerant recovery, and installation repairs cost extra. Always register immediately upon installation to activate coverage and document purchase date.

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