4 Ton 14 SEER 96% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Downflow Review 2026

// Bottom Line

This Goodman system delivers strong heating efficiency at 96% AFUE and solid cooling at 14 SEER, making it ideal for homeowners prioritizing cost savings without sacrificing performance. The downflow configuration and A-coil design suit retrofit applications and tight spaces well.

Review

The Goodman 4-ton combo system pairs a 100,000 BTU furnace with a 48,000 BTU air conditioner in a single downflow package. This mid-range unit targets contractors and homeowners seeking reliable performance without premium pricing. The A-coil configuration and downflow orientation make it practical for basement installations and tight spaces where traditional upflow units won't fit. Online Supply markets this as a straightforward replacement option for standard residential applications.

Efficiency numbers tell the real story here. The furnace achieves 96% AFUE, meaning nearly all fuel converts to usable heat with minimal waste up the flue. The 14 SEER air conditioner provides respectable cooling efficiency for homes in moderate climates. However, single-stage operation means the compressor and burner run at full capacity whenever engaged, missing efficiency gains available from modulating systems. The scroll compressor is proven technology with minimal maintenance requirements over its lifespan.

Pros & Cons

Pros

96% AFUE furnace efficiency translates to lower heating bills year-round
14 SEER cooling rating meets Energy Star thresholds at reasonable price point
Scroll compressor is proven technology with good reliability track record
Multi-speed blower motor provides flexible operation and quieter part-load performance
Downflow configuration works in basements and tight attic installations
10-year warranty with online registration offers solid protection

Cons

Single-stage compressor and burner limit efficiency gains at partial load conditions
74 dB noise level is audible during operation, noticeable in quiet spaces
Not Energy Star certified despite good individual component ratings
Requires 26.4 to 45 amp circuit, higher power draw than some competitors

Who Should Buy

Best For

Budget-conscious homeowners in moderate climates replacing aging systems who value upfront savings and straightforward installation. This system suits retrofit jobs in basements where the downflow design fits existing ductwork without major modifications.

Consider Alternatives If

Homeowners in very cold climates needing maximum heating efficiency, or those in noise-sensitive environments like master bedrooms adjacent to furnace locations.

4 Ton 14 SEER 96% AFUE 100,000 BTU Goodman Gas Fur

Buy at HVACDirect →

Installation

This downflow system needs 26.4 to 45 amp electrical service and PVC exhaust flue routing. The 3/8 inch liquid line and 7/8 inch suction line with 3/8 inch insulation follow standard connections. Multi-speed blower motor requires proper ductwork sizing for the 2000 CFM maximum airflow. Horizontal or downflow mounting positions work in basements, closets, or utility rooms where vertical clearance is limited.

Warranty & Reliability

Ten-year parts and compressor coverage applies with online registration at Goodman's website. This standard protection covers defects in materials and workmanship but excludes damage from improper installation, maintenance neglect, or non-approved refrigerants. Registration is quick and strongly recommended since it doubles effective coverage periods for future repairs.

Specifications

SKU	LS38783830
Brand/Manufacturer	Online Supply
Cooling BTU	48,000
Heating BTU	100,000
Refrigerant	R410A or R22
Electrical	115 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	74
Weight (in lbs)	30.000000
Feature	Spec
Energy Star	No
SEER1 (Efficiency)	14
Condenser Stages	Single Stage
Compressor Type	Scroll
Liquid Valve Size	3/8"
Suction Valve Size	7/8"
Max Breaker Size	45 amps
Min. Breaker Size	26.4 amps
Tonnage	5 Ton
Height	34.5"
Width	21"
Depth	28.75"
Resources	Goodman Brochure Goodman Installation Instructions Goodman Parts Manual Goodman Service Manual Goodman Specifications 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	Downflow/Horizontal
Liquid Line	3/8"
Suction Line	7/8"
Style	A-Coil
Airflow Direction	Downflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Furnace Efficiency / AFUE	96%
Blower Motor	Multi Speed
Maximum CFM	2000
Flue Location	Right
Burner Stages	Single
Fuel Type	Gas
Suction Line Insulation Thickness	3/8"
Length	30 feet

Frequently Asked Questions

What is the actual cooling capacity in BTU? +

The unit delivers 48,000 BTU of cooling output, which equals 4 tons of cooling capacity. Despite the product title mentioning 4 tons, the specs show 5 ton tonnage rating, which refers to the overall system size classification rather than actual cooling delivery.

Can this replace my old system without major ductwork changes? +

The downflow configuration makes it compatible with basement installations and retrofit situations. The A-coil design fits standard plenum spaces. Your existing 2000 CFM capacity ductwork will handle this unit's maximum airflow, though a technician should verify proper sizing.

How much will heating and cooling costs decrease? +

The 96% AFUE furnace cuts heating waste to just 4 percent compared to older 78-80% units, saving roughly 15-20 percent on winter bills. The 14 SEER cooling is competitive for standard systems, offering moderate improvements over 10 SEER units from previous decades.

Is this system better than mid-range brands like Rheem or Ruud? +

Goodman offers comparable efficiency ratings at lower prices due to streamlined manufacturing. Single-stage operation is shared across brands at this price tier. Higher-tier systems from all manufacturers offer modulating compressors and variable-stage burners for better part-load efficiency.

What happens if I don't register for the 10-year warranty? +

Without registration, you receive standard manufacturer coverage, typically 5 years. Registration extends protection to 10 years at no cost, making it worthwhile to complete during installation.

Affiliate disclosure: IndustrialRank earns a commission on qualifying purchases at no extra cost to you. We only recommend products we have independently reviewed.