Goodman 3.5 Ton 14 SEER 80% 100,000 BTU Furnace & AC System - R410A Upflow Review 2026

// Bottom Line

This Goodman 3.5 ton system is ideal for homeowners seeking a balanced combination of cooling and heating performance without premium pricing. The 80% AFUE furnace and 14 SEER air conditioning deliver solid efficiency gains over older equipment, making it a practical replacement for contractors serving mid-sized residential applications.

Review

The Goodman 3.5 ton furnace and AC combo represents a practical middle ground in residential HVAC equipment. This upflow system pairs an 80% AFUE gas furnace generating 100,000 BTU with a 14 SEER air conditioner producing 42,000 BTU cooling. Manufactured by Online Supply under SKU LS381183850, it targets homeowners upgrading from aging equipment who need reliable performance without stepping into premium pricing tiers. Energy Star certification confirms efficiency credentials for tax incentives and rebates.

Performance specifications reveal a competent but not cutting-edge system. The furnace's two-stage burner and multi-speed blower deliver up to 2,000 CFM airflow, enabling better temperature control than single-stage models. The scroll compressor handles single-stage cooling with respectable 14 SEER efficiency. SEER1 rating of 16 indicates some seasonal variation in performance. Electrical requirements are modest at 120V, 1 Phase, 60 Hz operation with 22.4 to 35 amp breaker sizing. The A-coil configuration supports both upflow and downflow installations.

Pros & Cons

Pros

14 SEER cooling efficiency meets Energy Star standards with 42,000 BTU capacity for reliable warm-weather performance
80% AFUE furnace with two-stage burner and multi-speed blower maximizes heating comfort during winter months
R410A refrigerant compatibility ensures compliance with modern EPA standards and future-proof operation
10-year warranty with online registration provides solid peace of mind for equipment protection
Single-stage scroll compressor design is mechanically simple, reducing repair complexity and labor costs

Cons

14 SEER rating lags behind higher-efficiency 16+ SEER systems that command lower operating costs over time
80% AFUE furnace efficiency means 20% heat loss through exhaust, unlike 95%+ AFUE high-efficiency models
73 dB noise level at operation is moderately loud for sensitive environments or close proximity to living spaces

Who Should Buy

Best For

Budget-conscious homeowners replacing 10+ year old equipment, or contractors outfitting rental properties where upfront cost matters more than premium efficiency. This system works well for moderate climates where heating and cooling demands balance reasonably.

Consider Alternatives If

Anyone in extreme heating climates needing maximum furnace efficiency, or those prioritizing lowest possible electric bills should explore 16+ SEER units and 95% AFUE furnaces instead.

Goodman 3.5 Ton 14 SEER 80% 100,000 BTU Furnace &

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Installation

Installation demands standard residential HVAC practices. The unit requires metal exhaust flue for furnace venting, proper R410A refrigerant line sizing (3/8 inch liquid, 7/8 inch suction), and 50 feet of suction line insulation at 1/2 inch thickness. Multi-speed blower wiring and dual-stage furnace controls need competent electrical integration. Dimensions of 30 inches height, 21 inches width, and 21 inches depth fit typical mechanical closets. Professional installation is strongly recommended for warranty validity.

Warranty & Reliability

Goodman backs this system with a 10-year parts warranty upon online registration, providing solid protection against manufacturing defects. Registration is straightforward and essential for activating coverage. This warranty length is competitive for mid-tier equipment, though premium systems often extend to 12-15 years. Coverage applies to the compressor, furnace heat exchanger, and coil components, giving reasonable peace of mind through the first decade of operation.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	42,000
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
Product Features	Rebate Available
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	35 amps
Min. Breaker Size	22.4 amps
Tonnage	5 Ton
Valve Type	Sweat
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	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 the 14 SEER rating compare to newer systems? +

14 SEER is respectable but mid-range. Current market leaders achieve 16-18 SEER ratings that reduce cooling costs 10-30% annually. This system works well for moderate climates or owners accepting slightly higher summer bills in exchange for lower upfront investment. The SEER1 rating of 16 indicates some performance variance under seasonal conditions.

Is this furnace efficient enough for northern climates? +

At 80% AFUE, this furnace converts four-fifths of fuel to usable heat while 20% vents away. For harsh winters, 95%+ AFUE high-efficiency models recover additional heat and reduce fuel waste significantly. This unit suits moderate heating zones but may cost more to operate in severe climates over 15-20 year equipment life cycles.

Can I use R22 refrigerant as the specs suggest? +

The specs list R410A or R22 compatibility, but R22 is phased out in the US for environmental reasons. Always use R410A to ensure compliance, optimal efficiency, and future serviceability. Technicians increasingly refuse R22 work, making refrigerant sourcing problematic long-term for older refrigerant types.

What's the real-world lifespan compared to higher-tier Goodman models? +

Single-stage compressors in this unit typically last 15-20 years with proper maintenance. Higher-efficiency two-stage models may extend slightly beyond this, but the difference is marginal. Regular filter changes, annual servicing, and prompt repairs matter far more than equipment tier for longevity outcomes.

Does online registration really matter for the 10-year warranty? +

Yes, absolutely. Without registration, Goodman limits coverage to 5 years. Taking five minutes to register online doubles your warranty protection period. Keep documentation and registration confirmation for any future claims or unit transfer to new owners.

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