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 suits homeowners in mixed climates who want serious heating and cooling efficiency without overspending. The 96% AFUE furnace paired with 16 SEER cooling covers both seasons well, especially for homes upgrading from older equipment.

Review

This Goodman combination system pairs a high-efficiency gas furnace with an air conditioning condenser, offering year-round climate control in one package. The 96% AFUE furnace and 16 SEER condenser make this an Energy Star qualified unit, appealing to cost-conscious homeowners and contractors who need proven equipment without premium pricing. Goodman's reputation for durability and straightforward engineering dominates the mid-tier HVAC market, and this upflow configuration suits most residential installations.

The furnace delivers 120,000 BTU heating capacity with two-stage burner technology, allowing efficient low-fire operation during partial load conditions. Cooling output reaches 42,000 BTU from a single-stage scroll compressor running on R410A or R22 refrigerant. The multi-speed ECM blower maxes out at 2000 CFM, adapting airflow to match actual heating and cooling demand. At 73 dB, the outdoor condenser runs slightly louder than premium units, but remains acceptable for most residential settings.

Pros & Cons

Pros

96% AFUE furnace efficiency reduces heating costs year-round, meeting or exceeding most modern code requirements
16 SEER cooling rating qualifies as Energy Star, delivering strong summer performance for a 3.5 ton unit
Two-stage burner and multi-speed ECM blower provide precise temperature control and comfort modulation
10-year warranty with online registration covers parts and labor gaps on a budget-friendly system
Single-stage scroll compressor is proven reliable architecture with lower failure rates than reciprocating designs
PVC plastic flue exhaust simplifies venting requirements in tight installation spaces

Cons

Specs show conflicting tonnage information, listing both 3.5 ton and 5 ton, which creates confusion during sizing
73 dB noise level is moderately loud for a condenser unit, noticeable in quiet suburban neighborhoods
Single-stage cooling means no part-load efficiency gains during mild weather or shoulder seasons

Who Should Buy

Best For

Homeowners replacing 10+ year old furnace and AC units who prioritize heating efficiency and want a reliable, cost-effective combo system. This fits tight budgets where split systems from premium brands cost significantly more while delivering similar real-world performance.

Consider Alternatives If

Buyers in very quiet residential settings or those seeking variable-speed cooling should explore two-stage or modulating systems despite higher upfront costs.

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

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Installation

Upflow configuration fits basements and mechanical closets, requiring minimal ductwork modification. PVC plastic flue exhaust simplifies venting through exterior walls. Electrical demands run 115V single-phase 60Hz at 23.5 to 40 amp breaker range, standard for residential service panels. Line sets measure 3/8 inch liquid and 1 1/8 inch suction, with 50 feet of included suction insulation protecting against heat gain.

Warranty & Reliability

Ten-year parts and labor warranty activates upon online registration, covering manufacturing defects on the compressor, coil, and gas furnace components. This factory backing is competitive for Goodman units and protects against major failures during the critical first decade of operation.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	42,000
Heating BTU	120,000
Refrigerant	R410A or R22
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	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	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

What's the actual cooling capacity, and is this a true 3.5 ton unit? +

The specs show 42,000 BTU cooling output, which equals 3.5 tons exactly. However, the tonnage field lists both 3.5 and 5 ton values, creating confusion. Request clarification from your supplier before purchase to confirm which tonnage you're actually receiving.

Can I use existing ductwork from my old system? +

The 2000 CFM maximum airflow is typical for 3.5 ton units. Most homes with older 3-4 ton systems have compatible ducts, but pressure testing before installation prevents costly retrofit work. Undersized returns will reduce efficiency significantly.

How much will this cost to operate monthly? +

At 96% AFUE and 16 SEER, heating and cooling efficiency sits well above national averages. Your actual costs depend on local gas and electricity rates, climate, and home insulation. A well-sealed 2000 sq ft home in mixed climates typically saves 20-30% versus 80s-era equipment.

How does this compare to higher-end systems from Carrier or Trane? +

Premium brands offer variable-stage compressors and quieter operation, costing 40-60% more. For real-world comfort in moderate climates, this Goodman performs similarly during peak heating and cooling. You pay extra mainly for finer modulation and brand prestige.

What warranty coverage applies if I don't register online? +

Registration is required to activate the 10-year warranty. Without it, you may lose coverage or face significant deductibles. Register immediately after installation through Goodman's website.

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