4 Ton 15 SEER 96% AFUE 120,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This Goodman system delivers solid year-round efficiency for homeowners in moderate climates looking for reliable heating and cooling without premium pricing. The 96% AFUE furnace and 16 SEER2 air conditioner make it a smart choice for those balancing energy savings with upfront costs.

Review

Goodman's reputation in the HVAC market centers on delivering capable equipment at reasonable price points, and this 4-ton upflow system exemplifies that positioning. The unit combines a 120,000 BTU two-stage furnace with a 45,500 BTU air conditioner in a compact A-coil configuration suited for tight mechanical spaces. The ENERGY STAR certification and modern refrigerant (R410A) signal competent engineering without premium-tier features that drive up costs.

Performance metrics tell the story here. The furnace achieves 96% AFUE efficiency through advanced combustion control and a multi-speed ECM blower motor that adjusts airflow from 0 to 2,000 CFM based on heating demand. The air conditioner delivers 16 SEER2 cooling efficiency using a scroll compressor, though the single-stage operation means it runs at full capacity or off with no in-between modulation. This straightforward approach sacrifices some comfort granularity but reduces mechanical complexity and service needs.

Pros & Cons

Pros

96% AFUE furnace efficiency reduces heating costs significantly compared to 80-90% baseline units
16 SEER2 air conditioning rating qualifies for ENERGY STAR, lowering summer cooling expenses
Two-stage burner and multi-speed ECM blower motor optimize comfort across varying load conditions
Lifetime heat exchanger warranty plus 10-year unit replacement coverage provides long-term peace of mind
PVC exhaust flue compatibility simplifies installation and reduces venting costs compared to metal flue requirements

Cons

Single-stage air conditioner compressor cannot modulate capacity, leading to less precise temperature control than two-stage units
73 dBA noise level is moderately loud during cooling operation and may be noticeable in quiet neighborhoods
5-ton cooling capacity exceeds stated 4-ton system rating, which could indicate oversizing or spec inconsistency in product documentation

Who Should Buy

Best For

Homeowners in mixed climates who need balanced heating and cooling performance and want to avoid utility rate shock without paying for ultra-premium equipment. Contractors installing replacement systems for customers who value warranty protection and straightforward commissioning.

Consider Alternatives If

Anyone prioritizing whisper-quiet operation or seeking variable-capacity compressors for maximum comfort should explore two-stage cooling alternatives.

4 Ton 15 SEER 96% AFUE 120,000 BTU Goodman Gas Fur

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Installation

The upflow A-coil design fits standard return-air plenums above horizontal ducts or in attics. Electrically, it requires 115V single-phase 60Hz power with breaker sizing between 23.9 and 40 amps, making it suitable for most residential panels. PVC exhaust flue compatibility eliminates the need for expensive metal venting systems. Refrigerant lines use 3/8-inch liquid and 1 1/8-inch suction sizing with 1/2-inch foam insulation included.

Warranty & Reliability

Goodman backs the heat exchanger for life, a significant commitment that protects your largest furnace component. The unit itself carries 10-year replacement coverage with 10-year parts warranty when registered online. This is solid mid-tier protection that balances manufacturer confidence with realistic wear expectations for a component system operating 15 to 20 years.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	45,500
Heating BTU	120,000
Refrigerant	R410A
Electrical	115 V. 1 Phase 60 Hz
Warranty	Lifetime Heat Exchanger, 10 Years Unit Replacement, and 10 Years Parts with Online Registration
Decibel Level (dBA)	73
Weight (in lbs)	48.000000
Feature	Spec
Replaces	GSX16S481
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	40 amps
Min. Breaker Size	23.9 amps
Tonnage	5 Ton
Height	34.5"
Width	24.5"
Depth	28.75"
Resources	GMEC96 Installation Manual GMEC96 Specifications Sheet GMEC96 Owner's Manual GMEC96 Service Manual GMEC96 Replacement Parts Manual GMEC96 Brochure Goodman Furnace 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	1 1/8"
Style	A-Coil
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Furnace Efficiency / AFUE	96%
Blower Motor	Multi-Speed - ECM
Maximum CFM	2000
Flue Location	Right
Burner Stages	Two
Fuel Type	Gas
Suction Line Insulation Thickness	1/2"
Length	50 feet

Frequently Asked Questions

Why does the spec sheet list 5 tons for cooling when this is marketed as a 4-ton system? +

This appears to be a documentation inconsistency. The cooling capacity of 45,500 BTU falls between 3.75 and 5 tons, but the tonnage field shows 5 tons. Verify the exact air handler pairing with your installer, as oversizing cooling capacity relative to heating can cause humidity and cycling issues.

Will this system work with my existing 80% AFUE furnace ductwork? +

Yes, the upflow configuration and 2,000 CFM maximum airflow are standard residential specifications. However, have an HVAC technician evaluate your ducts for proper sizing and seal quality. Undersized ducts waste the efficiency gains of a high-AFUE furnace, so ductwork upgrade may be worthwhile.

How much will I save on utility bills with 96% AFUE versus my old 80% furnace? +

Assuming 80% old furnace, the 96% unit recovers roughly 20% more combustion heat. Real-world savings depend on heating degree days in your climate, fuel cost, and run time. In cold climates, expect 15 to 20 percent annual heating cost reduction. Milder climates see proportionally smaller dollar savings.

How does this single-stage compressor compare to a two-stage or variable-capacity unit? +

Single-stage runs at full 45,500 BTU or off, cycling on demand. Two-stage runs quieter at reduced capacity most of the time. Variable-capacity offers maximum comfort but costs significantly more. Choose single-stage if budget and basic comfort matter most, or upgrade if you prioritize quiet operation.

What does the lifetime heat exchanger warranty actually cover? +

It covers manufacturing defects and rust-through on the heat exchanger component itself. Labor and refrigerant are typically excluded. This protects against the most expensive furnace failure point but verify coverage terms in the full warranty document before purchase.

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