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

// Bottom Line

This Goodman system works well for homeowners replacing older equipment or upgrading split systems in moderate to warm climates. The 96% AFUE furnace and 16 SEER2 AC deliver strong efficiency gains, though the single-stage compressor limits performance in extreme temperatures.

Review

The Goodman 3.5-ton upflow furnace-AC system represents a pragmatic choice for residential heating and cooling replacements. This manufacturer consistently delivers dependable equipment at competitive price points, and this model combines gas heating with air conditioning in a single integrated package. The upflow configuration fits standard basement or utility closet installations common in North American homes. Online Supply distributes this unit with straightforward specs and standard Goodman documentation, making sourcing straightforward for contractors.

Performance metrics are genuinely strong where they matter most. The furnace achieves 96% AFUE efficiency, meaning 96 of every 100 BTU consumed converts to usable heat, placing it in the high-efficiency category. The AC delivers 16 SEER2 rating with a scroll compressor that handles 42,000 BTU cooling capacity. The two-stage burner and ECM multi-speed blower (up to 2000 CFM) enable modulating operation rather than full on-off cycling, improving comfort and reducing energy waste during partial-load conditions.

Pros & Cons

Pros

96% AFUE furnace rating means lower heating bills compared to 80-90% units, saving $15-25 monthly in winter
16 SEER2 air conditioner with scroll compressor and ECM blower reduces cooling costs by 20-30% versus baseline models
Two-stage burner and multi-speed blower allow modulating operation for better comfort and efficiency
PVC/plastic flue exhaust simplifies venting in modern homes without masonry chimneys
ENERGY STAR certified for EPA recognition and potential utility rebate eligibility

Cons

Single-stage compressor cannot ramp down capacity, reducing efficiency during mild weather operation
73 dB noise level is higher than variable-capacity competitors, noticeable during AC startup
5-ton cooling capacity with only 42,000 BTU cooling output creates tonnage specification mismatch that needs clarification

Who Should Buy

Best For

Homeowners in moderate climates replacing failed furnace-AC units who prioritize efficiency over premium features. Contractors seeking reliable, mid-tier equipment for standard residential retrofit jobs where ENERGY STAR compliance adds resale value.

Consider Alternatives If

Buyers in extreme climates, very large homes, or those prioritizing quiet operation should look at variable-capacity systems with two-stage compressors.

3.5 Ton 15 SEER 96% AFUE 120,000 BTU Goodman Gas F

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Installation

Installation requires 115V single-phase 60Hz service with 23.5 to 40-amp breaker sizing. The unit accepts standard 3/8 inch liquid lines and 7/8 inch suction lines with 1/2 inch insulation (50 feet included). A-coil configuration with right-side flue placement offers flexibility. PVC exhaust venting simplifies installation compared to masonry requirements, though proper condensate drainage and ductwork sealing remain critical for peak efficiency.

Warranty & Reliability

Goodman provides 10 years full parts and labor coverage upon online registration. This warranty is competitive for mid-tier equipment and covers compressor, heat exchanger, and coil failures. Registration is required to activate protection, so buyers must complete documentation promptly. Extended warranty options may be available through the distributor.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	42,000
Heating BTU	120,000
Refrigerant	R410A
Electrical	115 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	73
Weight (in lbs)	48.000000
Feature	Spec
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	23.5 amps
Tonnage	5 Ton
Height	30"
Width	24.5"
Depth	21"
Resources	CAPT Installation Manual CAPT 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	Plastic / PVC
Furnace Efficiency / AFUE	96%
Blower Motor	Multi-Speed - ECM
Maximum CFM	2000
Configuration	Upflow / Downflow
Flue Location	Right
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

Why does the spec show 5-ton but title says 3.5-ton? +

This appears to be a data entry discrepancy. The 42,000 BTU cooling capacity actually aligns with 3.5-ton sizing (12,000 BTU per ton). Verify with Online Supply before purchase, as tonnage mismatch can impact warranty and performance claims.

Can this system connect to an existing ductwork from my old furnace? +

Yes, provided existing ducts are sealed and properly sized for 2000 CFM maximum airflow. The A-coil design works with upflow or horizontal installations. Have an HVAC contractor evaluate duct sizing and seal condition, as undersized ducts reduce efficiency gains.

How much will this reduce my energy bills compared to a 10-year-old unit? +

Older furnaces typically run 80-85% AFUE and AC units at 10-12 SEER. This system's 96% AFUE and 16 SEER2 can deliver 20-30% heating cost reduction and 25-35% cooling savings, depending on climate and usage patterns.

Is single-stage compressor a dealbreaker compared to variable-capacity systems? +

Not for moderate climates. Single-stage runs at full capacity until cooling demand drops below setpoint, then cycles off. This increases runtime during mild spring or fall days. Variable-capacity systems reduce at part-load but cost significantly more.

Does Online Supply offer installation support or is this DIY only? +

Online Supply is a distributor, not an installer. Purchase includes CAPT installation manuals and spec sheets. Licensed HVAC contractors must handle installation to maintain warranty and ensure safety compliance.

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