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 excels for homeowners in mixed climates who want excellent heating efficiency (96% AFUE) combined with strong cooling performance (16 SEER1, 42,000 BTU). It's ideal for those willing to invest upfront for lower utility bills and who value the flexibility of dual-fuel operation with propane or natural gas.

Review

The Goodman 3.5-ton system positions itself as a mid-to-premium option in the gas furnace and air conditioner market. With 96% AFUE heating efficiency and 16 SEER1 cooling performance, this unit targets homeowners who view HVAC as a long-term investment. Online Supply backs it with a 10-year warranty on parts and a full 50-foot suction line insulation kit included. The Energy Star certification signals genuine efficiency credentials rather than just marketing claims.

Performance specs tell a compelling story for heating and cooling. The furnace delivers 120,000 BTU with two-stage burner technology, while the AC condenser produces 42,000 BTU of cooling capacity. The variable-speed ECM blower motor adjusts from 0 to 2,000 CFM based on actual demand, reducing energy waste during partial-load operation. Operating on 115V single-phase power with a 23.5 to 40-amp breaker range, it fits standard residential electrical infrastructure. Cooling uses R410A refrigerant with 3/8-inch liquid and 1 1/8-inch suction line sizing.

Pros & Cons

Pros

96% AFUE furnace efficiency captures nearly all fuel energy, significantly reducing heating costs compared to 80-90% units
16 SEER1 rating and Energy Star certification deliver strong cooling efficiency for a 3.5-ton system
Two-stage burner and variable-speed ECM blower optimize comfort by reducing short cycling and temperature swings
Scroll compressor is proven reliable across thousands of units with minimal failure rates
PVC exhaust compatibility simplifies venting, eliminating expensive masonry vent requirements in many homes

Cons

Single-stage compressor means the AC can't modulate cooling capacity, running at full or nothing rather than matching demand
73 dB noise level is moderately loud for outdoor condenser operation, noticeable during summer
Product specs show conflicting tonnages (3.5-ton title versus 5-ton spec), creating confusion about actual system size

Who Should Buy

Best For

Homeowners in climates with significant heating and cooling seasons who prioritize energy efficiency and lower monthly bills. This system works especially well for those with access to natural gas or propane and who plan to stay in their home long enough to recoup the efficiency investment.

Consider Alternatives If

Budget-conscious buyers seeking the lowest upfront cost should look at single-stage, lower-SEER systems instead. Those wanting variable-capacity cooling should pursue two-stage or inverter-driven compressor units.

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

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Installation

Installation requires standard ductwork integration for upflow or downflow configurations. The A-coil design pairs with most existing furnace platforms. Electricians should note the 23.5 to 40-amp breaker requirement and 115V single-phase power draw. PVC exhaust venting eliminates complications with masonry vent systems. Professional installation is strongly recommended for refrigerant charging and ductwork sealing to achieve rated efficiency.

Warranty & Reliability

Goodman provides 10 years parts coverage when registered online, a solid commitment for residential use. The included evaporator coil warranty adds protection against refrigerant leaks. Registration is mandatory to activate the full term, so don't overlook this step. Coverage is parts-only, so labor costs remain your responsibility after the first year.

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.
AHRI Certificate Number	7368842
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Product Features	Rebate Available
Furnace Efficiency / AFUE	96%
Blower Motor	Variable Speed - ECM
Maximum CFM	2000
Configuration	Upflow / Downflow
Burner Stages	Two
Fuel Type	Propane, Natural 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

Does the spec sheet's 5-ton rating contradict the 3.5-ton product title? +

Yes, there's a notable inconsistency. The cooling output of 42,000 BTU aligns with 3.5-ton capacity (12,000 BTU per ton), but specs list 5-ton tonnage. Clarify with the supplier before purchase. This discrepancy could affect ductwork sizing and performance calculations.

What electrical work is needed for installation? +

The system needs 115V single-phase 60 Hz power with a breaker sized between 23.5 and 40 amps. Most homes have adequate service, but verify your panel has available capacity. A licensed electrician should handle breaker installation and hardwiring to ensure code compliance.

How much energy does the 96% AFUE actually save compared to older furnaces? +

An 80% AFUE unit loses 20% of fuel energy to exhaust. At 96% AFUE, you lose only 4 percent. On a 100,000 BTU/hour heating load, that's a 12-percentage-point improvement, translating to roughly 15-20% lower heating costs over a season depending on fuel prices.

Should I choose this over a high-efficiency heat pump for cooling? +

This gas furnace excels in cold climates where heat pumps struggle below freezing. The 96% AFUE gas heating outperforms electric resistance backup. In mild climates, a heat pump system might offer better year-round efficiency, but this Goodman wins where heating dominates utility bills.

Is the 10-year warranty worth the online registration hassle? +

Yes, absolutely. Registration takes five minutes and unlocks a decade of parts coverage. Without it, warranty drops significantly. Keep your receipt and registration confirmation accessible for any future claims.

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