3 Ton 17 SEER 96% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Horizontal Review 2026

// Bottom Line

This 3.5-ton Goodman hybrid system is ideal for homeowners seeking efficient heating and cooling without premium brand markups. The 96% AFUE furnace and 18 SEER1 air conditioner work together to deliver strong year-round performance for moderate climate zones.

Review

The Goodman 3 Ton 17 SEER 96% AFUE gas furnace and air conditioner system represents a practical middle ground in the HVAC market. Marketed at $89, this horizontal A-coil unit targets homeowners and contractors seeking efficient climate control without the premium pricing of top-tier brands. Goodman's reputation for reliability combined with strong efficiency ratings makes this system a viable option for residential replacements in moderate climate zones.

Performance metrics align well with modern efficiency standards. The furnace delivers 100,000 BTU output at 96% AFUE, meaning 96 cents of every heating dollar converts to usable heat. Cooling reaches 35,000 BTU with an 18 SEER1 rating, exceeding Energy Star thresholds and qualifying for utility rebates. Two-stage burner and scroll compressor stages operation for improved part-load efficiency. Variable-speed ECM blower handles up to 2,000 CFM, adapting automatically to actual heating or cooling demand. The R410A refrigerant and sweat-connection valve design support straightforward installation.

Pros & Cons

Pros

96% AFUE gas furnace minimizes heating fuel waste, reducing winter utility bills significantly
18 SEER1 cooling efficiency exceeds Energy Star requirements, qualifying for utility rebates
Two-stage burner and compressor allow modulated operation, improving comfort and efficiency at part load
Variable-speed ECM blower adjusts airflow intelligently, preventing short cycling and reducing noise
Lifetime heat exchanger warranty protects against costly furnace failures, plus 10-year parts coverage

Cons

71 dB noise level runs moderately loud during cooling, noticeable in quiet neighborhoods
3.5-ton capacity oversizes this unit slightly for many homes, potentially causing short cycling if ductwork isn't optimized
Requires 115V single-phase power and 21.3 to 35 amp breaker, limiting installation locations

Who Should Buy

Best For

Budget-conscious homeowners in moderate climates replacing aging furnace and AC units want strong efficiency without brand premium pricing. Contractors installing systems for price-sensitive customers need reliable equipment with solid warranties and straightforward horizontal/upflow configurations.

Consider Alternatives If

Homeowners in extremely hot climates needing maximum cooling capacity or acoustic-sensitive installations should evaluate higher SEER systems or units rated below 70 dB.

3 Ton 17 SEER 96% AFUE 100,000 BTU Goodman Gas Fur

$89

Buy at HVACDirect →

Installation

This horizontal A-coil configuration suits attic, basement, or utility closet placement. Requires 115V single-phase 60 Hz power with breaker capacity between 21.3 and 35 amps. Suction line needs 7/8 inch diameter with 3/4 inch insulation thickness over 50 feet maximum length, while liquid line uses 3/8 inch connections. Plastic or PVC exhaust flue requirement accommodates modern condensing furnace venting. Proper ductwork sizing and airflow verification are essential for stable operation.

Warranty & Reliability

Goodman provides lifetime coverage on the heat exchanger, addressing the most expensive potential furnace failure. Parts warranty extends 10 years with online product registration, protecting compressors, motors, and control boards. This combination delivers solid long-term protection compared to many competitors offering 5-year standard terms. Registration requirement is straightforward and typically completed during installation.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	35,000
Heating BTU	100,000
Refrigerant	R410A
Electrical	115 V. 1 Phase 60 Hz
Warranty	Lifetime Heat Exchanger and 10 Years Parts with Online Registration
Decibel Level (dBA)	71
Weight (in lbs)	30.000000
Feature	Spec
Product Features	Rebate Available
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 Install 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	7/8"
Style	A-Coil
AHRI Certificate Number	7368836
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Furnace Efficiency / AFUE	96%
Blower Motor	Variable Speed - ECM
Maximum CFM	2000
Burner Stages	Two
Fuel Type	Propane, Natural Gas
Suction Line Insulation Thickness	3/4"
Length	50 feet

Frequently Asked Questions

What does 18 SEER1 actually mean for my cooling costs? +

SEER1 measures cooling efficiency as BTU output per watt-hour input. An 18 SEER1 unit uses roughly 33% less electricity than a 12 SEER baseline. For average cooling seasons, homeowners typically see $200-400 annual savings depending on local electricity rates, usage patterns, and climate zone temperature variations.

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

This model supports both natural gas and propane fuel types. Conversion between fuels requires adjusting the burner orifice, a task typically handled during installation by your HVAC contractor. Verify your fuel source availability before purchasing to confirm compatibility with local utility infrastructure.

Is 3.5 ton capacity the right size for my home? +

Tonnage depends on square footage, insulation, climate, and ductwork efficiency. This 3.5-ton unit handles approximately 3,500-4,200 square feet in moderate climates. Oversizing causes short cycling and reduced efficiency. Have an HVAC contractor perform load calculations using ACCA Manual J methodology to confirm proper sizing before purchase.

How does this Goodman system compare to Bryant or Carrier units? +

Goodman shares similar engineering and efficiency with Carrier's lower-tier lines but typically costs 15-25% less. Bryant occupies mid-range pricing. This Goodman delivers competitive SEER1 and AFUE ratings with comparable warranty coverage, making it ideal for budget-conscious buyers prioritizing performance over brand prestige.

What registration do I need for the 10-year warranty? +

Online product registration through Goodman's website within 60 days of installation activates the 10-year parts coverage. Provide your AHRI certificate number 7368836, purchase date, and installation details. Lifetime heat exchanger coverage applies automatically regardless of registration status.

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