3.5 Ton 15 SEER 97% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This Goodman system excels for homeowners seeking premium heating efficiency without premium pricing. The 97% AFUE furnace with modulating burners and 16 SEER2 cooling is ideal for moderate climates where heating dominates utility costs.

Review

The Goodman 3.5-ton upflow system targets the value-conscious homeowner who wants genuine efficiency gains without brand-name premium pricing. This unit pairs a high-efficiency furnace rated 97% AFUE with a 16 SEER2 air conditioner, positioning it firmly in the upper efficiency tier. The modulating burner design and variable-speed blower set it apart from standard single-stage equipment still common in residential installations. Upflow configuration suits homes where ductwork rises from basement or crawlspace, making it a practical retrofit option.

Heating performance reaches 100,000 BTU with continuous modulation, meaning the furnace adjusts flame intensity to match actual demand rather than running full-blast at fixed cycles. This reduces energy waste and maintains more stable indoor temperatures. The ECM blower varies from idle to 2,000 CFM, optimizing air distribution across different comfort zones. Cooling delivers 42,000 BTU at 16 SEER2 efficiency, though actual tonnage classification appears overstated based on cooling output. R410A refrigerant is standard but faces phase-out timelines. Electrical demands range from 23.5 to 40 amps at 115V single-phase, fitting most residential panels.

Pros & Cons

Pros

97% AFUE furnace efficiency reduces heating costs significantly, translating to roughly 3% annual savings versus 94% AFUE competitors
Modulating burner stages adjust output continuously rather than cycling on/off, improving comfort and reducing temperature swings
Variable-speed ECM blower motor delivers up to 2,000 CFM with optimized airflow for each cycle, not just full blast
16 SEER2 rating provides Energy Star certification and qualifies for utility rebates in many regions
Scroll compressor is proven architecture known for longevity in residential applications
Plastic PVC exhaust flue reduces installation complexity and corrosion risk compared to metal alternatives

Cons

5-ton cooling capacity listed but only 42,000 BTU cooling output creates specification mismatch that needs clarification from supplier
Single-stage condenser means cooling operates at fixed capacity without modulation like the heating side
73 dB noise level is audible, especially for units located near bedrooms or living spaces
R410A refrigerant is being phased out by EPA, limiting future service options and long-term availability

Who Should Buy

Best For

Homeowners in heating-dominant climates looking to minimize fuel costs through high-efficiency equipment. Contractors installing complete systems where upflow configuration matches existing ductwork layout and utility rebate programs are available.

Consider Alternatives If

Those prioritizing cooling performance or living in hot climates should seek a higher-capacity condenser unit. Buyers needing the quietest operation available should consider alternative brands with sub-70 dB ratings.

3.5 Ton 15 SEER 97% AFUE 100,000 BTU Goodman Gas F

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Installation

Installation complexity is moderate. The upflow/horizontal configuration requires vertical ductwork space, typically a basement return with overhead trunk lines. Plastic PVC exhaust flue simplifies venting compared to metal alternatives, reducing corrosion risk in humid climates. Suction line insulation thickness of 1/2 inch helps prevent refrigerant superheat and condensation. Standard 3/8 inch liquid line and 1 1/8 inch suction line connections are industry-compatible. Most experienced HVAC contractors complete installation within one day with proper tools and ductwork already in place.

Warranty & Reliability

Ten-year parts warranty applies with online registration, covering compressor, heat exchanger, and major components. This matches mid-tier manufacturers but trails Lennox and Carrier's extended protections. Goodman's evaporator coil carries separate warranty coverage detailed in provided documentation. Warranty does not typically cover refrigerant, labor, or system modifications. Registration is straightforward but mandatory to activate full term.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	42,000
Heating BTU	100,000
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	21"
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	7424267
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	Upflow / Downflow
Flue Location	Right
Burner Stages	Modulating
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

Why does the specs show 5-ton tonnage but only 42,000 BTU cooling output? +

This appears to be a data error from the supplier. Standard 5-ton units produce roughly 60,000 BTU cooling. The 42,000 BTU output matches a 3.5-ton condenser. Contact the retailer for clarification before purchase to ensure you receive correct cooling capacity for your home's size.

Can this unit replace my existing furnace and AC separately? +

Yes, this is a complete system designed for replacement installations. However, you must verify ductwork compatibility with upflow configuration. If your home uses downflow or horizontal returns, you'll need different unit orientation. The 30x21x21 inch cabinet footprint should fit standard mechanical closets.

How much will the 97% AFUE actually save me annually compared to a 94% AFUE furnace? +

The 3-percentage-point efficiency gain typically saves 3 to 5 percent on heating costs depending on fuel prices and climate severity. In northern regions, that translates to $100 to $300 yearly. Many utilities offer rebates of $500 to $1,500 for 97% AFUE installations, often recovering the efficiency premium within 2 to 4 years.

Is this system better than Lennox or Carrier equipment at similar efficiency levels? +

Goodman uses proven components like scroll compressors at competitive pricing, roughly 15 to 25 percent below Lennox or Carrier at identical SEER2 ratings. Brand reputation differs; Goodman ranks average for longevity. This unit suits budget-conscious buyers comfortable with mainstream service, not luxury buyers seeking premium support.

What does the 10-year warranty actually cover if something breaks? +

Coverage includes compressor, heat exchanger, and coil defects with online registration. Labor, refrigerant, and installation repairs are not covered. You must use a qualified technician, and proof of proper maintenance may be required for claim eligibility. Review full warranty terms before purchase.

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