3.5 Ton 14 SEER 80% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This Goodman system works well for homeowners replacing aging equipment who prioritize affordability over premium features. The 14 SEER rating and 80% AFUE deliver respectable efficiency for the price point, making it ideal for moderate climates where peak performance isn't critical.

Review

The Goodman 3.5 ton gas furnace and air conditioner system sits comfortably in the practical middle ground of the residential HVAC market. Manufactured by Online Supply under the Goodman label, this upflow configuration delivers 80,000 BTU heating capacity and 42,000 BTU cooling from a compact A-coil design. At this price point, it competes directly with other builder-grade and replacement systems rather than premium efficiency models.

Performance metrics show a 14 SEER cooling efficiency rating paired with 80% AFUE furnace efficiency. The two-stage burner and high-efficiency multi-speed blower keep utility bills reasonable without premium pricing. Maximum airflow reaches 2000 CFM, adequate for most residential applications. However, the single-stage condenser means cooling efficiency drops considerably at part-load conditions common in spring and fall months, a trade-off typical of budget systems.

Pros & Cons

Pros

14 SEER cooling efficiency beats many competitors in this price range
Two-stage burner provides better comfort and lower operating costs than single-stage units
High-efficiency multi-speed blower motor adapts to actual cooling and heating demands
Compact 21x21x30-inch footprint fits tight utility closets and basements
10-year warranty with online registration offers solid protection for the investment

Cons

80% AFUE is adequate but trails newer 95% AFUE condensing furnaces by significant margin
Single-stage condenser limits part-load efficiency compared to two-stage cooling systems
73 dB noise level runs louder than premium models, noticeable during operation
Not Energy Star certified, meaning higher long-term operating costs than qualified units
R410A refrigerant is being phased out, potentially complicating future service calls

Who Should Buy

Best For

Budget-minded homeowners in moderate climates replacing 15+ year old systems, and contractors installing rental properties where upfront cost matters more than efficiency optimization. This unit makes financial sense in areas with moderate heating and cooling seasons.

Consider Alternatives If

Anyone in extremely hot or cold climates needing year-round efficiency, homeowners planning to stay 20+ years seeking maximum energy savings, or those wanting ENERGY STAR certification.

3.5 Ton 14 SEER 80% AFUE 80,000 BTU Goodman Gas Fu

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Installation

Installation requires standard line-set connections with 3/8-inch liquid and 7/8-inch suction lines, both readily available from supply houses. The unit needs 208/230V single-phase power with 22 to 35 amp breaker capacity. Upflow configuration demands metal exhaust flue and proper ductwork clearances. Most experienced HVAC installers complete setup in one day, though regional permitting adds timeline.

Warranty & Reliability

Goodman provides 10 years of parts warranty when you complete online registration after purchase. This covers the scroll compressor, evaporator coil, and other components, but requires proof of professional installation. Parts-only coverage is industry standard at this price tier, though some retailers offer extended labor plans separately.

Specifications

SKU	LS38783830
Brand/Manufacturer	Online Supply
Cooling BTU	42,000
Heating BTU	80,000
Refrigerant	R410A
Electrical	208 / 230 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	73
Weight (in lbs)	30.000000
Feature	Spec
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Metal
Furnace Efficiency / AFUE	80%
Blower Motor	High Efficiency Multi-Speed
Maximum CFM	2000
Configuration	Upflow / Downflow
Burner Stages	Two
Fuel Type	Gas
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.
Energy Star	No
SEER1 (Efficiency)	14
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 amps
Tonnage	5 Ton
Liquid Line	3/8"
Suction Line	7/8"
Style	A-Coil
Suction Line Insulation Thickness	3/8"
Length	30 feet

Frequently Asked Questions

How does 14 SEER compare to other cooling systems? +

14 SEER represents solid mid-tier cooling efficiency. High-efficiency units reach 18-20 SEER, while older systems sit at 10 SEER or below. This unit saves roughly 30% on cooling costs versus 10 SEER equipment, though premium systems save another 20-25% beyond that.

What does 80% AFUE furnace efficiency actually mean? +

80% AFUE means 80 cents of every heating dollar converts to home warmth; the rest vents outside. Modern condensing furnaces hit 95% AFUE, saving significantly over a 20-year lifespan. This unit is adequate for moderate climates but costs more to operate in harsh winters.

Can this system handle upflow and downflow installation? +

Yes, the configuration supports both directions. Upflow suits basements and crawl spaces where return air comes from below. Downflow works for attic placement in some layouts. Verify your existing ductwork compatibility before committing to either orientation.

Is the R410A refrigerant a problem for long-term service? +

R410A works effectively now but faces EPA phase-out by 2030. Future service calls may involve premium pricing as supplies tighten. For 10-15 year ownership, this poses minimal risk, but long-term owners should consider newer R32 systems.

How does the 10-year warranty protect my investment? +

Registration is required and covers parts only, not labor. This protects against compressor failure and coil leaks during the critical first decade. Homeowners often purchase separate labor warranties for additional coverage peace of mind.

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