3 Ton 17 SEER 80% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This 3-ton system delivers solid efficiency gains for homeowners upgrading from 10-year-old equipment, particularly in moderate climates where heating isn't extreme. At $2,557, it balances respectable performance with reasonable cost, making it attractive for budget-conscious replacements rather than premium installations.

Review

The Goodman 3-ton combination system occupies a practical middle ground in the split air conditioner and furnace market. Bundling cooling and heating into one package at $2,557 removes the complexity of sourcing separate units and negotiating two warranties. This Energy Star certified unit targets homeowners upgrading from 2010-2015 equipment, where efficiency gains justify replacement costs within 7-10 years.

Cooling performance centers on an 18 SEER2 scroll compressor condenser producing 35,000 BTU per hour, paired with a two-stage design that ramps down during mild days. The 80,000 BTU furnace delivers 80% AFUE, meaning 80 cents of every heating dollar converts to usable warmth. Variable-speed blower motor modulates airflow from 0 to 2,000 CFM, preventing the on-off cycling that creates temperature swings and dust redistribution in ducts.

Pros & Cons

Pros

18 SEER2 cooling efficiency exceeds the 15 SEER minimum for Energy Star qualification, reducing summer utility bills noticeably
Two-stage compressor and variable-speed blower motor adapt to partial-load conditions, improving comfort and lowering energy waste
80,000 BTU two-stage gas furnace handles heating across most climates without oversizing, gaining 80% AFUE efficiency
Scroll compressor is proven technology with fewer moving parts, supporting long service life in residential applications
Upflow A-coil configuration fits tight attics and confined spaces where standard equipment won't fit

Cons

80% AFUE lags modern condensing furnaces at 90-95%, meaning heating efficiency gains are modest over 5-10-year-old units
Spec sheet lists both 3-ton and 3.5-ton tonnage conflictingly, raising questions about rated cooling capacity clarity
71 dB noise level sits above quieter competitors, noticeable during compressor operation on warm days

Who Should Buy

Best For

Homeowners replacing failed or aging systems in climate zones 4-7 where heating and cooling demands balance reasonably. Contractors working budget-conscious residential replacements will appreciate straightforward installation and solid Goodman reliability without premium pricing.

Consider Alternatives If

Anyone prioritizing maximum heating efficiency or operating in extreme cold climates should explore 95% AFUE condensing units, and buyers in quieter neighborhoods may prefer systems under 68 dB.

3 Ton 17 SEER 80% AFUE 80,000 BTU Goodman Gas Furn

$2557

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Installation

Upflow A-coil configuration fits compact attic spaces and vertical closets, eliminating costly ductwork modifications on many retrofit jobs. Requires 3/4-inch suction line insulation and metal flue venting, standard in most homes. Electrical demands stay modest at 21.3 to 35 amps, 120V single phase, integrating easily into existing breaker panels. Sweat valve connections require competent brazing or certified installers.

Warranty & Reliability

10-year parts coverage through online registration protects against compressor failure, heat exchanger cracks, and component defects that typically emerge in years 3-8. Labor and refrigerant remain buyer responsibility, limiting coverage scope compared to 10-year fully inclusive plans. Registration is mandatory, not automatic, so homeowners must submit paperwork within 30 days of installation.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	35,000
Heating BTU	80,000
Refrigerant	R410A
Electrical	120 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	71
Weight (in lbs)	30.000000
Feature	Spec
Product Features	Two Stage Condenser
Energy Star	Yes
SEER1 (Efficiency)	18
Condenser Stages	Two Stage
Compressor Type	Scroll
Liquid Valve Size	3/8"
Suction Valve Size	3/4"
Max Breaker Size	35 amps
Min. Breaker Size	21.3 amps
Tonnage	3.5 Ton
Valve Type	Sweat
Height	34.5"
Width	21"
Depth	28.75"
Resources	Goodman Brochure Goodman Installation Instructions Goodman Parts Manual Goodman Service Manual Goodman Technical Information Goodman User Information Goodman Warranty 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	7/8"
Style	A-Coil
AHRI Certificate Number	204633302
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Metal
Furnace Efficiency / AFUE	80%
Blower Motor	Variable Speed
Maximum CFM	2000
Burner Stages	Two
Fuel Type	Propane, Natural Gas
Suction Line Insulation Thickness	3/4"
Length	50 feet

Frequently Asked Questions

Why does the spec sheet show both 3-ton and 3.5-ton ratings? +

The 3-ton refers to heating capacity, while 3.5-ton reflects the larger cooling condensing unit. This inconsistency is confusing but common in combo systems. Always verify your home's cooling load requires 3-ton capacity, typically 35,000-36,000 BTU. Oversizing wastes money and reduces dehumidification.

Can I install this in a basement or crawlspace instead of upflow? +

The A-coil configuration is designed for upflow mounting only. Horizontal installations risk oil trap issues in the compressor suction line and reduce efficiency. Consult your HVAC contractor before attempting non-standard orientation to maintain warranty coverage and safe operation.

How much will this save on my monthly electric bill compared to a 14 SEER unit? +

An 18 SEER unit cools roughly 28% more efficiently than 14 SEER. On a $200 monthly cooling bill, expect savings of $50-$60 during summer months. In mild climates, this equals $400-$500 annual cooling savings, offsetting the equipment cost premium in 5-6 years.

Is the 80% AFUE furnace adequate, or should I pay more for 95% AFUE condensing? +

In zones 4-7, 80% AFUE works fine and costs significantly less upfront. However, northern climate homeowners see 95% AFUE payback within 7-8 years through reduced gas consumption. Colder regions justify the premium, while moderate climates favor this unit's value equation.

Does the 10-year warranty cover refrigerant leaks or compressor burnout? +

Yes, compressor failure and refrigerant leaks receive parts coverage for 10 years after registration. However, labor costs and refrigerant refill charges fall to you. Total repair cost for a compressor leak typically reaches $800-$1,200 even with warranty protection.

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