4 Ton 15 SEER 97% AFUE 120,000 BTU Goodman Gas Furnace and Air Conditioner System - Horizontal Review 2026

// Bottom Line

This Goodman system works best for homeowners upgrading from older equipment who need dependable heating and cooling without premium pricing. The 97% AFUE furnace and modulating burner will noticeably reduce heating bills while the 15 SEER condenser handles summer cooling capably.

Review

Goodman positions this 4-ton gas furnace and air conditioner system as a workhorse replacement for aging residential HVAC equipment. The horizontal configuration targets attic and basement installations common in retrofit applications. At 97% AFUE, this furnace sits in Goodman's efficiency sweet spot, offering substantial fuel savings without the premium pricing of 98.5%+ models. The modulating burner design adjusts flame intensity based on demand, improving comfort response during cold snaps.

Heating output reaches 120,000 BTU with modulating burner stages for flexible operation. Cooling capacity measures 45,500 BTU (45.5 KBTU) at 15 SEER, offering solid summer performance on the 208/230V single-phase electrical service. The variable-speed ECM blower maxes out at 2,000 CFM and automatically reduces speed during mild weather, cutting parasitic electricity draw. R410A refrigerant support aligns with current EPA standards, though R22 compatibility extends replacement options for legacy systems.

Pros & Cons

Pros

97% AFUE furnace efficiency means only 3% energy loss, among the highest available
Modulating burner stages adjust heating output for consistent comfort and lower fuel consumption
Variable-speed ECM blower reduces runtime and electricity use compared to fixed-speed motors
120,000 BTU heating capacity covers most residential applications up to 4,000 square feet
Energy Star certified with 10-year warranty when registered online
Horizontal configuration and compact dimensions (24.5" H x 26" W) fit tight attic/basement spaces

Cons

15 SEER rating lags behind 18+ SEER systems available from premium manufacturers
Single-stage condenser cannot modulate cooling output like dual-stage units, limiting efficiency in mild weather
73 dB noise level audible during operation, higher than quieter inverter-based systems
Specs show conflicting tonnage (title says 4 ton, specs list 5 ton) creating confusion
PVC exhaust requirement limits installation flexibility compared to metal ductwork options

Who Should Buy

Best For

Homeowners in moderate climates replacing 15+ year old furnace-AC combos will see immediate energy savings and reliable performance. Contractors installing budget-conscious residential systems will appreciate the straightforward horizontal setup and Goodman's parts availability.

Consider Alternatives If

Buyers in extreme climates or those seeking the highest efficiency ratings should explore 18+ SEER dual-stage units, which cost more but deliver better modulation and lower operating noise.

4 Ton 15 SEER 97% AFUE 120,000 BTU Goodman Gas Fur

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Installation

This system requires plastic or PVC exhaust flue with right-side flue location in the specified layout. Horizontal orientation demands careful ductwork planning to maintain airflow balance. The compact footprint (24.5" height, 26" width, 21.125" depth) simplifies attic placement. Electrical installation needs 23.9 to 40 amp breaker sizing on 208/230V service. AHRI certificate 7424268 confirms proper matched component performance for your jurisdiction.

Warranty & Reliability

Goodman provides 10-year parts and labor coverage when registered online. This extended protection from the manufacturer covers compressor, heat exchanger, and major components. Registration documentation remains critical for claim eligibility. Check Online Supply's specific coverage terms alongside Goodman's master warranty to understand any labor hour limitations or regional service network constraints.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	45,500
Heating BTU	120,000
Refrigerant	R410A or R22
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
AHRI Certificate Number	7424268
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Product Features	Rebate Available
Furnace Efficiency / AFUE	97%
Blower Motor	Variable Speed - ECM
Maximum CFM	2000
Configuration	Horizontal
Flue Location	Right
Energy Star	Yes
Burner Stages	Modulating
Fuel Type	Propane, Natural 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

Why does the title say 4 ton but the specs list 5 ton? +

This appears to be a specification error from the manufacturer or retailer. The cooling capacity (45,500 BTU) and AHRI certificate 7424268 reference suggest 4.5-ton nominal capacity. Contact Online Supply to confirm tonnage before purchase, as this discrepancy affects system matching, ductwork sizing, and warranty coverage accuracy.

Can I install this in my crawlspace with limited headroom? +

Yes, the horizontal configuration and 24.5-inch height fit compact spaces. However, verify PVC exhaust routing is feasible, as plastic flue requires proper slope and condensation drainage. Your installer must confirm right-side flue location works with your specific crawlspace layout and exterior wall access.

How much will this reduce my heating bills compared to my 20-year-old furnace? +

Most older furnaces operate at 78-85% AFUE. This Goodman's 97% efficiency means approximately 12-19 percentage points better fuel conversion. In a 4,000 square foot home heating 5,000 degree-days annually, expect 15-25% annual heating cost reduction, saving $300-600 depending on your gas rates.

Should I choose this or a higher SEER unit from another brand? +

This 15 SEER system suits mild-to-moderate climates well. If you're in the Deep South or Southwest, 18+ SEER dual-stage units justify the premium through faster payback. Goodman's advantage lies in parts availability, simpler maintenance, and contractor familiarity rather than peak efficiency ratings.

Is the 10-year warranty sufficient protection? +

Yes, 10 years covers typical component failure risks. Most premature issues appear in years 1-5. After year 10, your unit has recouped its initial cost. Ensure you register immediately after installation to activate coverage and keep receipts for all service records.

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