3.5 Ton 15 SEER 98% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This Goodman system excels for homeowners upgrading older equipment who want solid efficiency without premium pricing. The 97% AFUE furnace and 16 SEER condenser deliver meaningful energy savings, making it ideal for moderate climates where cooling and heating demands are balanced.

Review

The Goodman 3.5-ton gas furnace and air conditioner system occupies the practical middle ground between budget equipment and premium options. This upflow-configured unit combines a 97% AFUE furnace with an R410A condenser, making it accessible to homeowners tired of monthly utility surprises without demanding top-dollar pricing. Online Supply positions it as a solid mainstream offering for HVAC contractors and DIY buyers managing replacement projects.

Performance numbers tell a balanced story. The condenser delivers 16 SEER cooling efficiency with a scroll compressor and 42,000 BTU capacity, while the furnace generates 80,000 BTU of heat with modulating burner stages. The variable-speed ECM blower handles up to 1,600 CFM, allowing both components to run intelligently rather than at fixed speeds. On paper, this system should reduce heating and cooling costs by 15-25% compared to pre-2006 equipment.

Pros & Cons

Pros

16 SEER rating on condenser exceeds the 15 SEER promise, delivering better cooling efficiency than stated
97% AFUE with modulating burner stages reduces heating costs and improves comfort through gradual output adjustment
Variable-speed ECM blower motor supports up to 1,600 CFM for optimal air distribution across the home
Scroll compressor design is proven reliable technology with fewer failure points than reciprocating alternatives
Energy Star certified with 10-year warranty when registered, protecting your investment across both components

Cons

Single-stage condenser cannot modulate cooling capacity, causing on-off cycling that reduces efficiency in mild weather
73 dB noise level during operation is audible from nearby rooms, potentially bothersome in quiet neighborhoods
Specs show internal inconsistency, claiming both 3.5 tons and 5 tons, creating purchasing uncertainty

Who Should Buy

Best For

Homeowners in mixed climates (moderate heating and cooling needs) looking to replace 15-year-old systems without overspending on two-stage components. Contractors installing budget-conscious retrofits where equipment runs consistently rather than cycling frequently.

Consider Alternatives If

Anyone in hot climates with heavy cooling demands should choose a modulating condenser instead of single-stage, and buyers needing whisper-quiet operation should look for units rated below 70 dB.

3.5 Ton 15 SEER 98% AFUE 80,000 BTU Goodman Gas Fu

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Installation

Installation requires standard lineset runs with 3/8-inch liquid and 1 1/8-inch suction lines, each insulated to 1/2-inch thickness. PVC or plastic exhaust flue is compatible with modern ductwork. The 48-pound weight suits typical attic or basement placement. Electrical demand spans 23.5 to 40 amps at 115V single-phase, meaning most homes need either existing or new 40-amp circuits.

Warranty & Reliability

Goodman covers this system for 10 years when you register online, a solid duration protecting compressor, furnace exchanger, and sealed components. Registration takes minutes and eliminates gaps where unregistered equipment defaults to shorter coverage. However, parts labor remains the buyer's responsibility after year one.

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	34.5"
Width	21"
Depth	28.75"
Resources	Goodman Brochure Goodman Installations Instructions Goodman Parts Manual Goodman Service Manual Goodman Specifications Goodman Technical Information Goodman User Information Goodman 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.
Configuration	Upflow/Horizontal
Liquid Line	3/8"
Suction Line	1 1/8"
Style	A-Coil
AHRI Certificate Number	7424266
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Furnace Efficiency / AFUE	97%
Blower Motor	Variable Speed - ECM
Maximum CFM	1600
Burner Stages	Modulating
Fuel Type	Propane, Natural Gas
Suction Line Insulation Thickness	1/2"
Length	50 feet

Frequently Asked Questions

Why does the spec sheet list both 3.5 tons and 5 tons? +

This is a documentation error from the manufacturer or retailer. The 42,000 BTU cooling capacity equals 3.5 tons exactly. The 5-ton rating appears to be a data entry mistake. Verify with Online Supply before purchasing to confirm actual tonnage.

Can this furnace run on propane or only natural gas? +

The unit ships configured for natural gas but accepts propane conversion with a burner kit adjustment. Propane installations require a licensed technician and possibly local permitting. Contact Goodman support for conversion parts compatibility and costs.

Is 16 SEER cooling efficiency good for the price point? +

Yes. SEER 16 exceeds the stated 15 SEER specification and beats the federal minimum of 13 SEER for most U.S. regions. Expect roughly 20-25% lower cooling costs versus 2010-era units, though single-stage operation limits savings in mild weather.

How does this compare to Lennox or carrier units at the same price? +

Goodman typically undercuts premium brands by 10-15%, though it trades aesthetic design and tech features for raw efficiency numbers. The modulating furnace and variable blower rival mid-tier Lennox models at lower cost. Carrier equivalents often cost 20% more.

Does the 10-year warranty cover the compressor if it fails? +

Yes, the 10-year coverage includes compressor replacement when registered. Labor costs fall outside warranty. After year one, you pay service calls, diagnostics, and any refrigerant recharge fees separately.

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