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

// Bottom Line

This Goodman system delivers solid efficiency gains without premium pricing, making it ideal for homeowners replacing aging equipment or contractors seeking reliable mid-tier equipment. The 96% AFUE furnace and 16 SEER cooling coil combination offers legitimate energy savings while staying accessible at $3136.

Review

The Goodman 4 Ton gas furnace and air conditioning system hits a practical middle ground in the HVAC market. At $3136, it positions itself as an affordable upgrade for homeowners tired of paying premium prices for entry-level efficiency. The horizontal A-coil configuration makes this particularly valuable for retrofits where space limitations rule out traditional vertical units. Goodman's reputation for straightforward engineering means fewer bells and whistles, but also fewer failure points.

Performance numbers tell a compelling story. The furnace delivers 120,000 BTU heating output at 96% AFUE, meaning 96 cents of every energy dollar converts to heat rather than venting away. The cooling side provides 45,500 BTU capacity with a 16 SEER rating, which exceeds Energy Star thresholds. The variable-speed ECM blower motor runs between 0 and 2000 CFM, allowing the system to ramp output up or down based on demand rather than cycling on and off constantly. This modulation reduces temperature swings and energy waste.

Pros & Cons

Pros

96% AFUE furnace efficiency significantly reduces heating costs compared to older 80-85% models
16 SEER cooling rating exceeds Energy Star requirements and qualifies for many utility rebates
Variable speed ECM blower motor adjusts output from 0 to 2000 CFM for improved comfort and efficiency
Horizontal A-coil configuration fits tight attic and basement spaces where vertical units won't work
Two-stage burner and two-stage cooling provide better modulation and more consistent temperatures

Cons

73 dB noise level is audible during operation, higher than premium units with sound dampening
Single-stage condenser limits capacity modulation in mild weather, increasing runtime
Scroll compressor is durable but less efficient than variable-displacement designs in newer premium models

Who Should Buy

Best For

Homeowners in moderate climates replacing 15-20 year old systems will see immediate utility bill reductions, typically recovering the investment within 8-10 years through heating and cooling savings. Contractors installing in rental properties or spec homes will appreciate the balance of performance, reliability, and competitive pricing.

Consider Alternatives If

Buyers seeking cutting-edge technology or those in extremely hot climates should evaluate higher SEER ratings like 18-21 SEER systems that offer better part-load efficiency.

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

$3136

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Installation

Installation requires standard HVAC connections: 3/8-inch liquid line and 1 1/8-inch suction line with 1/2-inch insulation. The unit draws 208/230V single-phase power and needs a 23.9 to 40-amp breaker. Plastic or PVC exhaust flue is required. Weighing 48 pounds and measuring 36.25 inches tall by 35.5 inches wide and deep, horizontal placement fits most attics and basement mechanical closets. Most contractors complete installations in 4-6 hours.

Warranty & Reliability

Goodman provides 10 years of parts coverage with online registration, a solid mid-tier warranty. Registration is essential, as unregistered units typically fall to standard limited coverage. This duration matches most competitor offerings at this price point and covers compressor failures, heat exchanger cracks, and component defects that commonly occur after year 3.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	45,500
Heating BTU	120,000
Refrigerant	R410A
Electrical	208 / 230 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	73
Weight (in lbs)	48.000000
Feature	Spec
Configuration	Downflow/Horizontal
Liquid Line	3/8"
Suction Line	1 1/8"
Tonnage	4 Ton
Style	A-Coil
Height	36.25"
Width	35.5"
Depth	35.5"
Resources	Goodman Brochure Goodman Specifications Goodman Installation Manual Goodman Warranty Information Goodman Service Instructions Goodman Kit Instructions Goodman Parts Manual 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.
AHRI Certificate Number	7368845
Airflow Direction	Downflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Product Features	Rebate Available
Furnace Efficiency / AFUE	96%
Blower Motor	Variable Speed - ECM
Maximum CFM	2000
Energy Star	Yes
Burner Stages	Two
Fuel Type	Propane, Natural Gas
Replaces	GSX16S481
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
Suction Line Insulation Thickness	1/2"
Length	50 feet

Frequently Asked Questions

How much can I expect to save on heating compared to my old 80% AFUE furnace? +

At 96% AFUE versus 80%, you'll recover approximately 16% of heating energy costs annually. On a $1200 annual heating bill, expect savings around $190 per year. Combined with 16 SEER cooling savings, total utility reductions typically reach $400-600 annually depending on climate and usage patterns.

Will this horizontal unit fit in my attic space, and what clearance do I need? +

At 36.25 inches tall and 35.5 inches by 35.5 inches in footprint, it's designed for tight spaces. You need minimum 50 feet of suction line length per specs. Ensure 12 inches of clearance around the unit for airflow and service access. Have your HVAC installer verify your ductwork compatibility before ordering.

What's the difference between 16 SEER and the 20+ SEER units I see advertised? +

SEER measures seasonal cooling efficiency. This unit's 16 SEER is solid mid-tier performance that qualifies for rebates in most states. Higher SEER units use variable-displacement compressors and enhanced circuitry, costing $2000-3000 more. For moderate climates, 16 SEER delivers 85-90% of the efficiency gains at significantly lower cost.

Is this Goodman system comparable to Lennox or Carrier equipment at similar prices? +

Goodman competes directly with Carrier Performance and Lennox Merit series at this price point. All three offer similar AFUE and SEER ratings. Goodman edges ahead on availability and cost, while Carrier and Lennox sometimes include slightly better insulation or compressor types. For value-conscious buyers, Goodman delivers equivalent reliability at $200-400 lower pricing.

What does the 10-year warranty actually cover, and what's excluded? +

The warranty covers defects in materials and workmanship on all components including compressor, heat exchanger, and blower motor. It excludes damage from improper installation, refrigerant leaks from wear, maintenance neglect, and acts of nature. Registration is mandatory. Contact Goodman support for claims, not your installer.

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