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

// Bottom Line

This Goodman system suits homeowners in moderate climates who prioritize heating efficiency and want to maximize savings on natural gas bills. The 96% AFUE rating and two-stage burner deliver genuine comfort without excessive energy waste, making it practical for homes with existing ductwork.

Review

Goodman's 4-ton upflow system brings legitimate two-stage heating capability to mid-range residential installations. At 100,000 BTU input and 96% AFUE, this furnace sits in the efficiency sweet spot where operational savings become measurable without requiring premium pricing. The variable-speed ECM blower and PVC exhaust compatibility make it practical for retrofit work on existing homes while maintaining modern performance standards.

Heating performance delivers consistent results with 100,000 BTU capacity split across two burner stages, allowing the system to run efficiently during partial-load conditions common in shoulder seasons. The 45,500 BTU cooling side uses a scroll compressor on R410A refrigerant, though the single-stage design means peak efficiency only at full load. Electrical requirements are reasonable at 115V single phase with a maximum 40-amp breaker, fitting standard residential service. The 1/2-inch suction line insulation and proper valve sizing support reliable long-term operation.

Pros & Cons

Pros

96% AFUE furnace efficiency means only 4% heat loss, translating to real savings on winter heating costs
Two-stage burner automatically adjusts to heating demand, reducing short cycling and improving comfort during mild weather
Variable-speed ECM blower motor delivers 2000 CFM maximum while adapting to actual ductwork resistance
ENERGY STAR certified for both heating and cooling sides of the system
10-year warranty with online registration covers compressor and parts comprehensively

Cons

Single-stage air conditioner limits part-load cooling efficiency during moderate weather compared to two-stage competitors
SEER1 rating of 16 is outdated metric; SEER2 would provide more accurate efficiency comparison for modern standards
Scroll compressor can be noisier at 73 dB compared to rotary or variable-displacement alternatives

Who Should Buy

Best For

Homeowners in colder climates who heat for 6+ months annually will see the strongest return on that 96% AFUE rating. This works especially well for those replacing older 80-85% AFUE furnaces where monthly gas bill reductions justify the investment quickly.

Consider Alternatives If

Buyers prioritizing cooling performance in hot, humid climates should look at dual-stage or variable-speed compressor systems instead, as the single-stage cooling leaves efficiency gains on the table during summer.

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

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Installation

This upflow configuration fits standard A-coil style installations in basements or utility closets. The 30-inch height, 21-inch width and depth make it compact enough for tight spaces while accommodating 2000 CFM airflow. PVC exhaust capability simplifies venting through walls on newer homes. Most contractors estimate 6-10 hours for complete installation including ductwork connections and refrigerant charge verification.

Warranty & Reliability

The 10-year parts and compressor warranty activates with online registration, providing solid protection against manufacturing defects. This covers refrigerant leaks, compressor failure, and component breakdown typical of residential systems. Goodman's warranty process is straightforward through most HVAC distributors, though you'll need proof of installation and registration documentation.

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	10 Years 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	30"
Width	21"
Depth	21"
Resources	CAPT Installation Manual CAPT 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.
AHRI Certificate Number	7368836
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Product Features	Rebate Available
Furnace Efficiency / AFUE	96%
Blower Motor	Variable Speed - ECM
Maximum CFM	2000
Configuration	Upflow / Downflow
Burner Stages	Two
Fuel Type	Propane, Natural Gas
Liquid Line	3/8"
Suction Line	1 1/8"
Style	A-Coil
Suction Line Insulation Thickness	1/2"
Length	50 feet

Frequently Asked Questions

How does 96% AFUE compare to standard furnaces? +

A 96% AFUE furnace converts 96 of every 100 BTU into usable heat, while older models waste 15-20% up the flue. On a 100,000 BTU furnace running 1500 hours per winter, that difference saves roughly 2-3 million BTU annually, translating to 200-300 dollars in gas savings depending on local rates.

Can I install this in an upflow and downflow configuration? +

Yes, the system supports both upflow and horizontal installation, though you'll need an A-coil evaporator matched to your air handler. Downflow installation requires gravity drain capability for condensate, so verify your ductwork layout before ordering. Contact your HVAC distributor to confirm the exact coil configuration for your application.

Why does a two-stage furnace matter for efficiency? +

Two-stage burners run at low fire (roughly 60-65% capacity) during mild weather, avoiding the constant on-off cycling of single-stage units. This reduces temperature swings, cuts short-cycling losses, and delivers more even heating comfort. Your blower also ramps down proportionally, using less electricity when maximum heating isn't needed.

Is single-stage cooling a limitation compared to two-stage AC units? +

Single-stage runs full capacity whenever cooling is needed, so it delivers effective cooling but doesn't modulate during partial-load conditions common in spring and fall. Two-stage and variable-speed systems reduce capacity on mild days, lowering electricity use. For moderate climates, the difference matters; for hot regions, single-stage is typically sufficient.

What does the 10-year warranty actually cover? +

Parts and compressor are covered for manufacturing defects for 10 years with registration. This includes refrigerant leaks from failed components, compressor burnout, and internal failures. Labor is not covered, so you'll pay your technician's service call rate for repairs.

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