3 Ton 14 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Horizontal Review 2026

// Bottom Line

This Goodman system works well for homeowners replacing older furnaces in climate zones with moderate heating demands. The 80% AFUE rating and two-stage burner keep operating costs reasonable without premium pricing.

Review

The Goodman 3 Ton gas furnace with 14 SEER cooling combines straightforward heating-and-cooling capability in a single package designed for horizontal installation. Carrying Energy Star certification and priced competitively, this unit represents the practical middle ground between budget equipment and high-efficiency systems. Online Supply offers this configuration primarily to contractors and homeowners managing system replacements in existing homes where space and installation costs matter.

Performance numbers show solid but not exceptional specifications. The furnace delivers 100,000 BTU heating output at 80% AFUE efficiency using a two-stage burner and variable-speed blower reaching 2000 CFM maximum. The matching 3-ton air conditioner produces 34,800 BTU cooling capacity with 16 SEER2 efficiency using R410A refrigerant and a scroll compressor. These ratings position the system above entry-level equipment but below high-efficiency alternatives that command higher initial investment.

Pros & Cons

Pros

Two-stage burner reduces short-cycling and improves comfort during mild winter days
Variable speed blower motor allows better air distribution and quieter operation than fixed-speed alternatives
Energy Star certified with 80% AFUE efficiency, meeting mid-range standards for gas furnaces
Horizontal configuration fits tight attic and crawlspace installations measuring 21 inches tall
10-year warranty with online registration provides solid coverage for residential applications

Cons

80% AFUE is standard but not high-efficiency; modern condensing furnaces reach 95% AFUE and cost slightly more long-term
73.5 dB noise level is moderately loud during operation, noticeable in quieter homes
Requires metal flue exhaust, limiting installation flexibility in some retrofit scenarios

Who Should Buy

Best For

Homeowners in moderate climates replacing 15-20 year old furnaces who want reliable performance without premium pricing. This system suits budget-conscious buyers who don't need condensing efficiency but appreciate two-stage heating and variable blower control.

Consider Alternatives If

Anyone in cold climates expecting minimum operating costs should consider 95% AFUE condensing furnaces, which recover exhaust heat and deliver better long-term savings despite higher upfront investment.

3 Ton 14 SEER 80% AFUE 100,000 BTU Goodman Gas Fur

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Installation

This horizontal unit fits standard attic and crawlspace locations with compact dimensions of 21 inches tall, 21.125 inches wide, and 26 inches deep. Installation requires 208/230V single-phase 60 Hz power with 18.7 to 30 amp breaker sizing, making it compatible with most residential electrical panels. Metal exhaust flue is mandatory; pre-planning ducting routes prevents costly modifications during installation.

Warranty & Reliability

Goodman provides a 10-year parts warranty upon online registration, covering compressor and component failures during normal residential use. This coverage mirrors industry standard practice for mid-tier equipment. Warranty does not include labor or refrigerant, so verify contractor service agreements before purchase.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	34,800
Heating BTU	100,000
Refrigerant	R410A or R22
Electrical	208 / 230 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	73.5
Weight (in lbs)	30.000000
Feature	Spec
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
Height	21"
Width	21.125"
Depth	26"
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.
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	30 amps
Min. Breaker Size	18.7 amps
Tonnage	3.5 Ton
Liquid Line	3/8"
Suction Line	7/8"
Style	A-Coil
Suction Line Insulation Thickness	3/4"
Length	50 feet

Frequently Asked Questions

What makes the two-stage burner better than single-stage? +

Two-stage heating runs the burner at partial capacity (stage 1) during mild weather, reducing energy waste and maintaining steadier indoor temperatures. Full capacity (stage 2) engages only during cold snaps. Single-stage furnaces cycle on-and-off completely, creating temperature swings and higher utility bills in moderate climates.

Can this furnace connect to my existing ductwork? +

The horizontal A-coil configuration and 2000 CFM blower work with most standard residential duct systems installed after 2000. However, undersized ducts from 1980s homes may restrict airflow. Have an HVAC contractor measure your existing duct diameter and friction rates before committing to purchase.

How does 80% AFUE compare to newer furnaces? +

80% AFUE means 80 cents of every heating dollar reaches your home; the rest vents as exhaust. Modern 95% AFUE condensing furnaces recover that exhaust heat, reducing gas consumption by roughly 19%. Higher upfront cost pays back over 10-15 years in fuel savings for cold climates.

Is this unit quieter than older furnaces? +

At 73.5 dB, this furnace runs quieter than 1990s units (often 80+ dB) but louder than variable-capacity models with sound dampening (65-70 dB). Variable-speed blower helps, but expect noticeable operation during heating cycles in open-plan homes.

What does the 10-year warranty actually cover? +

Goodman covers parts and compressor failure after online registration. Labor, refrigerant, ductwork, and installation repairs are excluded. Always confirm your contractor includes warranty registration in their service agreement.

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