3 Ton 18 SEER 80% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Horizontal Review 2026

// Bottom Line

This Goodman system works well for contractors and homeowners needing a budget-conscious combo unit with solid efficiency ratings and straightforward installation. The 18 SEER cooling and 80% AFUE heating deliver real energy savings without premium pricing, making it ideal for moderate climate zones and replacement jobs where cost matters.

Review

The Goodman 3 Ton 18 SEER gas furnace and air conditioner system positions itself as a practical middle-ground option for residential HVAC contractors and homeowners balancing efficiency with affordability. At $2160, it undercuts premium systems while delivering Energy Star certification and respectable performance specs. Online Supply markets this horizontal configuration for flexible installation in various home layouts, making it accessible to both replacement and new construction projects.

Cooling performance centers on 35,000 BTU capacity with an 18 SEER rating, two-stage scroll compressor, and two-stage condenser for efficient part-load operation. The heating side produces 80,000 BTU at 80% AFUE through a two-stage natural gas burner. Variable-speed blower motor reaches 2000 CFM maximum while operating quietly at 71 dB. Unit runs on 120V single-phase 60 Hz power with 21.3 to 35-amp breaker range, requiring proper electrical sizing before installation.

Pros & Cons

Pros

18 SEER cooling efficiency exceeds most mid-range competitors, backed by Energy Star certification
Two-stage compressor and two-stage burner enable smoother operation and better part-load efficiency
Variable-speed blower motor delivers up to 2000 CFM with quiet operation at 71 dB
R410A refrigerant compatibility positions this for future compliance without retrofit headaches
10-year parts warranty with online registration provides solid protection at this price point
Horizontal/upflow configuration flexibility works in basements, attics, and crawlspaces

Cons

80% AFUE heating efficiency lags behind 95%+ AFUE models, costing more on natural gas bills over time
Specs list both 3 ton and 5 ton tonnage claims, creating confusion about actual capacity and real cooling output
Metal exhaust flue requirement limits installation flexibility in some retrofit scenarios
Maximum 35-amp breaker requirement means heavier electrical service draw during peak operation

Who Should Buy

Best For

Contractors stocking standardized equipment for mixed-climate replacement jobs, and homeowners in mild to moderate regions where heating doesn't dominate energy costs. Ideal for those prioritizing upfront savings and solid cooling performance without needing premium high-efficiency heating.

Consider Alternatives If

Buyers in northern climates where 80% AFUE heating losses significantly impact annual utility bills should consider 95% AFUE models, even at higher initial cost.

3 Ton 18 SEER 80% AFUE 80,000 BTU Goodman Gas Furn

$2160

Buy at HVACDirect →

Installation

This horizontal system accepts both R410A and R22 refrigerant, though R410A compatibility matters for future serviceability. Dimensions measure 24.5 inches tall by 26 inches wide by 21.125 inches deep with suction line insulation rated at 3/4 inch thickness and extending 50 feet maximum. Sweat valve connections use 3/8 inch liquid line and 7/8 inch suction line sizing. Metal exhaust flue requirement mandates proper venting installation with no flexible ductwork options.

Warranty & Reliability

Coverage includes 10 years parts protection upon online registration with Goodman, a reasonable mid-tier warranty for this price segment. Coverage excludes labor and service calls, meaning homeowners bear technician costs for repairs. Online registration requirement demands documentation retention, though the process typically takes minutes through Goodman's website.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	35,000
Heating BTU	80,000
Refrigerant	R410A or R22
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	5 Ton
Valve Type	Sweat
Height	24.5"
Width	26"
Depth	21.125"
Resources	CHPF Installation Manual CHPF 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.
AHRI Certificate Number	204633307
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Metal
Furnace Efficiency / AFUE	80%
Blower Motor	Variable Speed
Maximum CFM	2000
Configuration	Horizontal
Burner Stages	Two
Fuel Type	Propane, Natural Gas
Liquid Line	3/8"
Suction Line	7/8"
Style	A-Coil
Suction Line Insulation Thickness	3/4"
Length	50 feet

Frequently Asked Questions

Does this system actually provide 3 ton or 5 ton capacity? +

The spec sheet lists conflicting tonnage claims. The 35,000 BTU cooling capacity technically represents 2.9 tons, while heating reaches 6.7 tons in BTU equivalents. Contractor verification with AHRI certificate 204633307 confirms actual installed performance, since nominal tonnage differs from actual cooling output.

What breaker size do I need for this unit? +

Minimum breaker size is 21.3 amps, maximum is 35 amps. Most installations use 30-amp breakers as the practical standard. Verify your home's electrical panel capacity before purchase, as undersizing creates safety hazards and nuisance tripping during startup and peak cooling demand.

How much will this save on cooling bills compared to older units? +

An 18 SEER unit cuts cooling costs roughly 40 to 50 percent versus 10 SEER systems from the 1990s. Real savings depend on climate and usage patterns. A home running AC 3000 hours yearly could save $300 to $600 annually, recovering initial cost through energy efficiency over 5 to 8 years.

Should I upgrade to a higher AFUE furnace instead of 80%? +

In northern climates where heating dominates energy costs, upgrading to 95% AFUE returns investment faster despite higher purchase price. Southern and moderate climates see slower payback, making 80% AFUE acceptable. Compare local natural gas rates and heating degree days against upgrade cost before deciding.

Does the 10-year warranty cover everything? +

Warranty covers parts defects only when registered online within required timeframe. Labor, service calls, and refrigerant are excluded. Covers manufacturing defects but not wear items or damage from improper installation or maintenance.

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