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

// Bottom Line

This Goodman system works best for budget-conscious homeowners in moderate climates who want reliable heating and cooling without premium pricing. The 80% AFUE furnace pairs effectively with an unexpectedly efficient 16 SEER air conditioner, making it competitive for replacement jobs where upflow configuration fits existing ductwork.

Review

The Goodman 3.5 Ton combination furnace and air conditioning system positions itself as a practical middle-ground solution for residential HVAC replacement. This upflow-configured unit from Online Supply bundles an 80% AFUE gas furnace with a 16 SEER air conditioner into a single package, simplifying coordination for contractors and homeowners alike. The system carries Energy Star certification and includes a 10-year warranty with online registration, appealing to buyers who prioritize reliability and long-term support over cutting-edge efficiency ratings.

Performance specifications reveal capable equipment for moderate climates. The furnace delivers 100,000 BTU heating output with a single-stage burner and PSC multi-speed blower rated for 2,000 CFM maximum airflow. On the cooling side, the unit produces 42,000 BTU with a scroll compressor and surprisingly strong 16 SEER rating, suggesting solid heat exchanger design. The R410A refrigerant and 73 dB operating noise level keep it competitive with similarly priced systems. Electrical requirements are straightforward, demanding 22.4 to 35 amp service from a standard 120V, 60 Hz residential panel.

Pros & Cons

Pros

16 SEER cooling efficiency exceeds the stated 14 SEER rating, delivering better than advertised performance on the AC side
80% AFUE furnace with 100,000 BTU heating output handles most residential comfort needs in northern and moderate climates
Scroll compressor design runs quieter at 73 dB and typically lasts 15+ years with proper maintenance
Energy Star certified, qualifying for utility rebates that can offset initial equipment cost
10-year warranty with online registration provides solid long-term protection for parts and labor claims

Cons

Single-stage compressor means cooling cycles on and off rather than modulating, reducing comfort precision and efficiency gains in warm climates
80% AFUE is acceptable but not exceptional, leaving money on the table versus 95% AFUE systems over the unit's lifespan
Single-stage burner provides one heat output level, limiting part-load efficiency during mild weather cycling

Who Should Buy

Best For

Homeowners replacing an older system in upflow configuration who value proven reliability and reasonable efficiency without paying for variable-speed components. This system suits climates with moderate cooling demand and heating needs, particularly where utility rebates help offset the purchase price.

Consider Alternatives If

Anyone in hot climates needing maximum cooling efficiency should consider two-stage compressor models, and those with tight budgets should compare total cost of ownership against higher-efficiency options that reduce monthly energy bills.

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

Buy at HVACDirect →

Installation

Installation follows industry-standard practices for upflow systems. The A-coil design requires a metal exhaust flue exiting through the unit's top, suitable for attic or closet placement. Valve connections use sweat fittings with 3/8-inch liquid line and 7/8-inch suction valve, plus larger 1 1/8-inch suction line with 1/2-inch insulation. At 34.5 inches tall, 21 inches wide, and 28.75 inches deep, it fits most equipment closets. Total weight of 48 pounds allows single-person handling once refrigerant circuits are disconnected.

Warranty & Reliability

The 10-year parts and labor warranty with online registration represents standard industry coverage at this price point. Registration typically takes ten minutes through Goodman's website and activates protection immediately. Coverage includes compressor, heat exchanger, and most electrical components. This warranty covers manufacturing defects but excludes normal wear, improper installation, or refrigerant loss from leaks. Many contractors include registration as part of commissioning services.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	42,000
Heating BTU	100,000
Refrigerant	R410A
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	34.5"
Width	21"
Depth	28.75"
Resources	Goodman Brochure Goodman Installation Manual Goodman Parts Manual Goodman Service Manual Goodman Specifications Goodman Technical Information Goodman User Information You will need AdobeÂ® AcrobatÂ® 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.
Configuration	Upflow/Horizontal
Liquid Line	3/8"
Suction Line	1 1/8"
Style	A-Coil
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Metal
Furnace Efficiency / AFUE	80%
Blower Motor	Multi Speed - PSC
Maximum CFM	2000
Flue Location	Top
Burner Stages	Single
Fuel Type	Gas
Suction Line Insulation Thickness	1/2"
Length	50 feet

Frequently Asked Questions

Why does this unit list 3.5 tons but have 5-ton specifications in the tonnage field? +

The product data shows conflicting tonnage information. The title indicates 3.5 tons with 42,000 BTU cooling output, which calculates correctly as 3.5 tons (42,000 divided by 12,000 equals 3.5). The 5-ton entry appears to be a data entry error and should be disregarded in favor of the 3.5-ton rating confirmed by cooling capacity.

Can I install this myself, or do I need a licensed contractor? +

You need a licensed HVAC contractor. EPA refrigerant handling certification is required by law, and improper installation voids the warranty and creates safety hazards. Most contractors charge $800 to $1,200 for labor, including ductwork connections, electrical work, and system commissioning.

How does 16 SEER compare to other air conditioners at this price level? +

16 SEER is excellent for single-stage equipment at budget pricing. Most competing 3.5-ton systems in this price range offer 14 to 15 SEER, making this unit an efficiency standout. Two-stage or variable-capacity models reach 18 to 21 SEER but cost significantly more upfront.

Is 80% AFUE adequate for heating, or should I spend more on a high-efficiency furnace? +

80% AFUE is adequate but basic. For every 100,000 BTU burned, only 80,000 reaches your home. A 95% AFUE furnace costs $400 to $700 more but saves $100 to $200 annually on heating bills, recovering the investment in 3 to 7 years depending on climate and usage.

What does the 10-year warranty actually cover? +

The warranty covers manufacturing defects in compressor, heat exchanger, coils, and electrical components. It includes parts and labor when installed by a licensed contractor. It excludes refrigerant leaks, improper installation, and normal maintenance items like capacitors or blower motors after initial failure.

Affiliate disclosure: IndustrialRank earns a commission on qualifying purchases at no extra cost to you. We only recommend products we have independently reviewed.