4 Ton 16 SEER 96% AFUE 120,000 BTU Goodman Gas Furnace and Air Conditioner System - Horizontal Review 2026

// Bottom Line

This horizontal configuration works well for contractors installing in tight spaces like attics or crawlspaces where standard upflow units won't fit. The 96% AFUE furnace and 16 SEER air conditioner deliver solid efficiency for the price, especially for homeowners upgrading older systems.

Review

Goodman's 4 ton horizontal system brings practical efficiency to retrofit and space-constrained installations. The combination of a 96% AFUE furnace and 16 SEER air conditioner positions this unit competitively for residential heating and cooling in moderate climates. At 117 dollars for the furnace component, it delivers solid performance without boutique pricing. Contractors appreciate the horizontal design for attic and crawlspace applications where traditional upflow cabinets create installation headaches.

Performance numbers tell a reliable story. The furnace delivers 120,000 BTU heating output with two-stage burners that modulate based on demand, reducing short-cycling and improving efficiency. The air conditioner side produces 45,500 BTU cooling using a scroll compressor and R410A refrigerant. The ECM blower motor handles airflow from 0 to 2000 CFM, automatically adjusting to match system demand. These specs deliver ENERGY STAR qualification and represent a solid efficiency upgrade from 10 to 15 year old systems.

Pros & Cons

Pros

96% AFUE gas furnace exceeds most regional energy codes and minimizes heating losses
16 SEER air conditioner qualifies for ENERGY STAR certification and delivers 45,500 BTU cooling
Two-stage burner and single-stage compressor provide efficient part-load operation
Multi-speed ECM blower motor adjusts airflow from 0 to 2000 CFM for comfort and efficiency
Horizontal configuration ideal for attic, crawlspace, or basement installations with space constraints
PVC/plastic exhaust flue simplifies venting in retrofit applications

Cons

73 dB noise level runs moderately loud for a residential unit, noticeable during operation
Single-stage condenser means the air conditioner runs at full capacity even during mild weather
Tonnage mismatch listed as 5 ton condenser with 4 ton title creates potential confusion on system capacity

Who Should Buy

Best For

Contractors upgrading residential HVAC systems in homes with limited equipment space, and homeowners in moderate climates seeking reliable efficiency without premium pricing. This unit performs well in retrofit applications where horizontal orientation solves installation challenges.

Consider Alternatives If

Buyers in extremely hot climates needing two-stage cooling, or those prioritizing whisper-quiet operation should look at higher-end models with variable-speed compressors and sound dampening.

4 Ton 16 SEER 96% AFUE 120,000 BTU Goodman Gas Fur

$117

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Installation

Horizontal orientation requires careful placement in attics, crawlspaces, or basements with adequate clearance for servicing. PVC/plastic flue venting simplifies installation compared to metal ductwork requirements. Electrical demands are moderate at 208/230V single-phase 60Hz with breaker requirements between 23.9 and 40 amps. Refrigerant line sizing includes 3/8 inch liquid and 1 1/8 inch suction lines with 1/2 inch insulation thickness.

Warranty & Reliability

Ten-year parts warranty activates with online registration, providing solid coverage for compressor, heat exchanger, and major components. Registration is straightforward and required to unlock full protection. This warranty matches industry standards for mid-tier equipment and demonstrates Goodman's confidence in unit reliability. Coverage excludes wear items and installation labor.

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
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Furnace Efficiency / AFUE	96%
Blower Motor	Multi-Speed - ECM
Maximum CFM	2000
Configuration	Horizontal
Flue Location	Right
Energy Star	Yes
Burner Stages	Two
Fuel Type	Gas
Height	24.5"
Width	26"
Depth	21.125"
Resources	CHPF Installation Manual CHPF 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.
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
Tonnage	5 Ton
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 16 SEER actually mean for my cooling bills? +

SEER (Seasonal Energy Efficiency Ratio) of 16 means this air conditioner uses roughly 20 to 25 percent less energy than a 12 SEER unit over a full cooling season. Actual savings depend on climate, thermostat settings, and insulation, but expect 15 to 20 percent annual reduction versus older systems.

Will this fit in my attic space that's 24 inches tall? +

No, this unit measures 24.5 inches in height, 26 inches wide, and 21.125 inches deep. You need a minimum of 25 to 26 inches of clear vertical space, plus additional room for airflow return and service access on the right side where the flue exhausts.

How does 96% AFUE compare to my current furnace? +

96% AFUE means 96 cents of every heating dollar converts to usable heat, with only 4 cents lost up the flue. Most furnaces from 2005 or earlier rate around 78 to 82 percent AFUE, making this upgrade save 10 to 15 percent on heating bills annually.

Why does this say 4 ton in the title but 5 ton in the tonnage spec? +

This appears to be a data entry discrepancy from the supplier. The cooling capacity of 45,500 BTU divided by 12,000 equals 3.79 tons, closer to 4 ton. Clarify tonnage directly with your supplier before purchase to avoid coil mismatches.

Does the 10-year warranty cover everything? +

The warranty covers major components like the compressor and heat exchanger when registered online. It excludes labor, refrigerant, wear items, and damage from improper installation or maintenance. Registration is required within 30 days of activation.

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