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

// Bottom Line

This Goodman combo system works best for homeowners replacing older equipment in upflow configurations who prioritize heating efficiency and want solid all-around performance without premium pricing. The 96% AFUE furnace paired with a 16 SEER condenser makes it a legitimate choice for moderate climates where both heating and cooling matter equally.

Review

Goodman's 4-ton (or 5-ton depending on configuration) gas furnace and AC combo system represents the brand's solid engineering approach to residential HVAC. This upflow configuration has been a market standard for decades, and Goodman's ongoing refinement of the design shows in the efficiency ratings here. The system qualifies as Energy Star certified and comes with reasonable warranty protection, making it a legitimate contender for homeowners replacing equipment that's reached end-of-life.

Performance numbers tell the real story. The furnace delivers 120,000 BTU of heating at 96% AFUE efficiency, meaning 96 cents of every gas dollar converts to usable heat rather than exhausting up the flue. The AC side produces 45,500 cooling BTU at 16 SEER, with a scroll-type compressor that's known for reliability. The variable-speed ECM blower motor maxes out at 2000 CFM and adjusts automatically, reducing runtime and energy waste compared to fixed-speed designs. These specifications place the system solidly in the mid-to-upper efficiency tier without requiring premium installation complexity.

Pros & Cons

Pros

96% AFUE furnace efficiency reduces heating costs significantly compared to 80-90% units
16 SEER cooling rating with scroll compressor provides reliable, predictable performance
Variable-speed ECM blower motor adjusts airflow from 0 to 2000 CFM for comfort and efficiency
Two-stage burner in furnace allows modulation for better temperature control
Energy Star certified with 10-year warranty when registered online
Compatible with both R410A and R22 refrigerant for flexibility during transition periods

Cons

Single-stage compressor in AC section limits humidity control during partial-load conditions
73 dB noise level is moderately loud, noticeable during operation in quiet spaces
Requires 23.9 to 40 amp breaker sizing, limiting installation options on undersized electrical panels
Spec discrepancy lists both 4 ton and 5 ton in documentation, creating potential confusion

Who Should Buy

Best For

Contractors installing replacement systems in homes with existing upflow furnace footprints and homeowners in mixed climates needing strong heating output. This system appeals to buyers who understand that 96% AFUE furnace efficiency provides real ROI on gas heating bills over the equipment's lifespan.

Consider Alternatives If

Anyone in predominantly cooling climates should consider two-stage compressors for better dehumidification, and homes with noise-sensitive spaces should evaluate quieter options or sound dampening solutions.

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

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Installation

This upflow unit requires standard ductwork connections and sits in typical basement or utility closet spaces with its 30-inch height and 24.5 by 21 inch footprint. The system needs 115V single-phase 60 Hz power with a dedicated breaker between 23.9 and 40 amps, and it uses plastic or PVC exhaust flue, which simplifies venting. A-coil design works with the condenser unit, and the 50-foot maximum suction line allows reasonable outdoor placement flexibility.

Warranty & Reliability

Goodman offers a standard 10-year parts warranty when you register the equipment online. This covers manufacturing defects in the furnace, condenser coil, and compressor. Registration is straightforward through Goodman's website using the serial number. The warranty does not cover labor, refrigerant, or damage from improper installation or maintenance neglect.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	45,500
Heating BTU	120,000
Refrigerant	R410A or R22
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	24.5"
Depth	21"
Resources	CAPF Installation Manual CAPF 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	7368842
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

What does the 96% AFUE rating mean in dollar terms for my heating bills? +

AFUE measures combustion efficiency. A 96% unit wastes 4 cents per dollar on gas while older 80% equipment wastes 20 cents. On a typical heating season costing $1,200, you'd save roughly $192 annually versus 80% units. Payback happens in 5-8 years for most Midwest and Northeast homeowners through reduced gas consumption alone.

Can I install this system myself, or do I need a licensed technician? +

Refrigerant handling requires EPA Section 608 certification, which means professional installation is legally required. The furnace gas connections also demand licensed work. While DIY ductwork and electrical connections are possible in some jurisdictions, most building codes require licensed HVAC and gas fitters for system startup and safety testing.

How does 16 SEER compare to newer systems I've seen advertised at 18-21 SEER? +

16 SEER is solid mid-tier efficiency. Higher SEER ratings typically come from dual-stage or variable-stage compressors that modulate cooling output. This single-stage design is simpler and more durable but less sophisticated. For moderate cooling loads, the efficiency difference translates to roughly 10-15% higher AC operating costs versus 18+ SEER units.

I see conflicting tonnage specs, 4 ton and 5 ton. Which is correct? +

The documentation contains a discrepancy. SKU LS381183850 specs indicate 5 tonnage, but the product title says 4 ton. Verify with your supplier or AHRI certificate 7368842 before ordering. This confusion could affect refrigerant charge and ductwork sizing, so confirm exact capacity with the installer prior to delivery.

Does the 10-year warranty cover everything if something breaks? +

The warranty covers manufacturing defects in compressor, furnace, and coil when registered online. It excludes labor costs, refrigerant, and damage from improper installation, maintenance, or damage. Keep maintenance records and follow the manual to preserve coverage.

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