4 Ton 15 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This Goodman combo system works best for budget-conscious homeowners replacing older equipment in existing upflow installations. The 80% AFUE heating and 16 SEER cooling offer solid efficiency gains without premium pricing, though you're sacrificing some performance compared to high-efficiency alternatives.

Review

The Goodman 4-Ton gas furnace and air conditioner system lands firmly in the practical middle ground of residential HVAC. Priced at $117, this upflow-configured unit combines 100,000 BTU heating capacity with 45,500 BTU cooling output, handling most single-family homes in moderate climates. The Energy Star certification signals respectable efficiency without premium pricing. Online Supply positions this as a direct replacement for older equipment, making it attractive for straightforward retrofit jobs where ductwork and mounting already exist.

Performance specs show 80% AFUE furnace efficiency with two-stage burners and a high-efficiency multi-speed blower reaching 2,000 CFM. The air conditioning side delivers 16 SEER1 efficiency with a scroll compressor, exceeding the advertised 15 SEER baseline. The unit accepts both R410A and R22 refrigerant, though R410A is standard on new equipment. At 73 decibels, noise output runs slightly higher than inverter-driven competitors, a tradeoff for simpler mechanics and lower initial cost.

Pros & Cons

Pros

Energy Star certified with dual-stage burners reducing runtime and fuel costs
16 SEER cooling efficiency beats the 15 SEER advertised price point
High-efficiency multi-speed blower motor handles variable load demands effectively
Compact 30x21x21 inch footprint fits tight installation spaces
10-year warranty with online registration provides reasonable long-term protection
Scroll compressor design known for durability in residential applications

Cons

80% AFUE is mid-range, not high-efficiency like 95%+ units available today
Single-stage cooling compressor less efficient than variable-capacity models
73 dB noise level higher than quieter inverter-driven competitors
R410A or R22 refrigerant compatibility creates future servicing considerations
SKU mismatch between GSX16S481 replacement listing and actual specifications raises questions

Who Should Buy

Best For

Homeowners replacing 15-20 year old split systems in existing upflow ductwork, or contractors stocking reliable mid-grade equipment for cost-conscious customers. Budget renovation projects where equipment cost matters more than peak efficiency appeal.

Consider Alternatives If

Buyers in regions with extreme climates seeking maximum efficiency, or anyone planning to keep equipment beyond 15 years and wanting cutting-edge inverter technology.

4 Ton 15 SEER 80% AFUE 100,000 BTU Goodman Gas Fur

$117

Buy at HVACDirect →

Installation

This upflow unit requires a metal exhaust flue and fits the A-coil configuration typical of furnace installations. Electrical needs are straightforward: 120V single-phase 60Hz service with 23.9 to 40-amp breaker sizing. The compact 30x21x21 inch footprint works in tight utility closets or basement installations. Proper suction line insulation (1/2 inch) and refrigerant line sizing (3/8 inch liquid, 1 1/8 inch suction) follow standard practices. Expect standard installation complexity for experienced HVAC techs.

Warranty & Reliability

The 10-year parts warranty requires online registration but covers major components and the evaporator coil. This is industry-standard coverage for mid-tier equipment, protecting you from compressor failures and heat exchanger defects. Warranty does not typically cover labor, refrigerant, or maintenance issues. Online registration takes five minutes and is essential to activate coverage upon installation.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	45,500
Heating BTU	100,000
Refrigerant	R410A or R22
Electrical	120 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	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.
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Metal
Furnace Efficiency / AFUE	80%
Blower Motor	High Efficiency Multi-Speed
Maximum CFM	2000
Configuration	Upflow / Downflow
Burner Stages	Two
Fuel Type	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 16 SEER cooling compare to the 15 SEER advertised in the title? +

The product specs show 16 SEER1 efficiency, which is better than promised. This likely reflects improved testing standards (SEER1 versus older SEER ratings). Real-world cooling costs will be roughly 6% lower than 15 SEER equipment, or about $80-150 annually depending on climate.

Can this unit replace my old 5-ton AC with 3-ton furnace? +

No. This is a 5-ton cooling unit with 100,000 BTU heating. Mismatching equipment tonnage causes efficiency loss and comfort issues. Your HVAC contractor must calculate proper sizing based on Manual J load calculations for your specific home.

Is 80% AFUE adequate for cold climates? +

80% AFUE works in moderate climates but struggles in zones below 0 degrees Fahrenheit frequently. High-efficiency 95% AFUE furnaces recover more heat, reducing fuel costs 15-20% annually. If you're in northern regions, consider upgrading to condensing technology.

What's the difference between R410A and R22 refrigerant compatibility? +

R410A is the modern standard and what will be installed. R22 compatibility means older techs can service it if needed, but new R22 production is phased out. Stick with R410A for 10+ years of reliable service and technician availability.

Does the 10-year warranty cover compressor failure? +

Yes, the warranty covers scroll compressor defects under normal operation. Labor and refrigerant are not included. Online registration is required within 30-90 days of installation to activate coverage.

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