4 Ton 15 SEER 96% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This Goodman system works best for homeowners upgrading from older equipment who want reliable, energy-efficient heating and cooling without premium pricing. The 96% AFUE furnace and 16 SEER2 condenser deliver measurable savings, especially in climates with moderate heating demands.

Review

The Goodman 4-ton system reviewed here is a workhorse combination furnace and air conditioner built for residential applications where dependable performance matters more than cutting-edge features. This 5-ton outdoor condenser paired with a 100,000 BTU furnace covers most homes between 1,500 and 2,500 square feet. It replaces the GSX16S481 model and arrives as a complete matched system, simplifying ordering and ensuring component compatibility from day one.

Performance numbers tell a clear story. The 96% AFUE rating on the furnace means 96 of every 100 fuel dollars convert to usable heat, with only 4 percent lost through venting. The 16 SEER2 cooling efficiency rating qualifies for Energy Star certification, delivering approximately 20-25 percent better cooling efficiency than 13 SEER baseline units. Two-stage heating and variable-speed blower operation prevent short-cycling and temperature swings, while the scroll compressor operates at a reasonable 73 decibels.

Pros & Cons

Pros

96% AFUE furnace efficiency captures nearly all fuel energy, reducing heating costs significantly versus 80-90% units
16 SEER2 rating on the 5-ton condenser qualifies for Energy Star, lowering summer cooling expenses
Two-stage burner and multi-speed ECM blower motor allow precise modulation for comfort and efficiency
Lifetime heat exchanger warranty protects against catastrophic failure, the most expensive furnace repair
Upflow A-coil configuration fits most existing residential installations without major ductwork changes
Scroll compressor design is proven, quiet at 73 dB, and easier to service than rotary alternatives

Cons

Single-stage cooling compressor cannot throttle capacity on mild days, wasting some efficiency potential
48-pound outdoor unit requires proper support and concrete pad preparation during installation
Requires 23.9-40 amp breaker sizing, so older electrical panels may need upgrade

Who Should Buy

Best For

Homeowners in moderate to cold climates replacing 10-15 year old furnace-AC units who prioritize reliability and measurable energy savings. Contractors installing systems in new construction or major renovations will appreciate straightforward upflow configuration and proven component sourcing.

Consider Alternatives If

Buyers seeking variable-capacity cooling or those in regions with minimal heating needs should compare single-stage limitations and consider higher-SEER alternatives.

4 Ton 15 SEER 96% AFUE 100,000 BTU Goodman Gas Fur

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Installation

This upflow A-coil configuration fits vertical installations common in attics and basements. The 34.5-inch height and 21-inch width pass through standard framing. Suction lines require 1-inch insulation with 50-foot maximum length, so indoor location within 50 feet of the outdoor unit is necessary. Plastic PVC flue venting is required, and the system needs 23.9-40 amp electrical service. Professional installation is highly recommended.

Warranty & Reliability

Goodman backs this unit with lifetime coverage on the heat exchanger, 10 years on unit replacement, and 10 years on parts when registered online. The lifetime heat exchanger warranty is substantial and covers the furnace component most likely to fail catastrophically. Registration is straightforward and extends coverage terms significantly compared to non-registered baseline warranties.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	45,500
Heating BTU	100,000
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	21"
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	1600
Flue Location	Right
Burner Stages	Two
Fuel Type	Gas
Suction Line Insulation Thickness	1/2"
Length	50 feet

Frequently Asked Questions

How does 16 SEER2 compare to older 13 SEER units? +

SEER2 uses stricter testing standards than the older SEER rating, so a 16 SEER2 unit typically performs like a 19-20 SEER by legacy measurements. Real-world cooling cost reductions average 20-25 percent compared to 13 SEER equipment, translating to roughly 200-300 dollars annual savings in moderate climates.

Can I install this myself or do I need a contractor? +

Professional installation is essential. Refrigerant charging, electrical connections, gas line work, and flue venting all require licensed technician expertise and local permits. DIY installation voids warranty and creates safety hazards. Budget 1,500-2,500 dollars for professional installation labor.

What's the difference between single-stage and two-stage cooling? +

This unit has single-stage cooling, meaning the compressor runs full capacity or off. Two-stage models modulate capacity on mild days, improving efficiency. For moderate climates where temperatures rarely hit extremes, single-stage performs adequately at lower cost, though variable-capacity units cost more upfront.

Is this system compatible with smart thermostats? +

Yes. The multi-speed ECM blower motor and two-stage burner are fully compatible with modern Wi-Fi thermostats. Installation requires matching the thermostat wiring to the furnished control board connections, a task contractors handle routinely.

What does the lifetime heat exchanger warranty actually cover? +

It covers defects in the heat exchanger itself, including cracks or corrosion, for the equipment's life. Labor is typically not covered unless purchased separately. This protects against the most expensive furnace failure scenario, estimated at 1,500-2,500 dollars in repair costs.

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