3 Ton 14 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This Goodman combo works best for homeowners replacing aging systems who want decent efficiency without premium pricing. The 14 SEER rating and two-stage burner deliver solid comfort and moderate operating costs for mild to moderate climates.

Review

Goodman's 3-ton gas furnace and air conditioning combo sits in the practical middle market. This upflow configuration handles 36,000 BTU cooling and 100,000 BTU heating, making it suitable for single-family homes in most climates. The system pairs a scroll compressor with a two-stage gas burner, balancing initial cost against performance. Online Supply's SKU LS38343830 targets contractors and homeowners wanting straightforward equipment without premium pricing or advanced controls.

The 14 SEER cooling rating delivers respectable efficiency for non-premium equipment, roughly 15% better than baseline 13 SEER units. The 80% AFUE gas furnace is functional but dated; modern 95% AFUE units save $2,000+ over fifteen years despite higher upfront cost. The multi-speed blower motor and 2000 CFM maximum airflow respond to varying loads. Single-stage compressor operation means the system runs full power or off, without modulation, which affects both efficiency and comfort consistency during partial-load conditions.

Pros & Cons

Pros

14 SEER cooling efficiency beats entry-level units and reduces summer energy bills meaningfully
Two-stage burner provides better heating comfort than single-stage models with less temperature swing
High-efficiency multi-speed blower motor, maximum 2000 CFM, adapts to actual heating and cooling demand
3/8-inch and 3/4-inch line sets support proper refrigerant flow without undersizing issues
10-year warranty with online registration covers both heating and cooling components

Cons

80% AFUE is dated by 2024 standards; 95%+ AFUE systems are now mainstream and save $150-300 annually
Single-stage compressor cycles on and off rather than modulating, reducing efficiency and comfort precision
73 dB noise level is moderately loud; high-efficiency units often run at 70 dB or below
Not ENERGY STAR certified, missing rebates and utility incentives some regions offer

Who Should Buy

Best For

Homeowners in moderate climates replacing 10+ year old systems who prioritize upfront cost control over long-term energy savings. Contractors stocking affordable 3-ton replacement units for budget-conscious residential customers.

Consider Alternatives If

Anyone in hot climates needing maximum cooling efficiency, homeowners staying 15+ years who benefit from 95% AFUE payback, or buyers pursuing ENERGY STAR rebates.

3 Ton 14 SEER 80% AFUE 100,000 BTU Goodman Gas Fur

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Installation

This upflow A-coil requires proper return air ducting and metal exhaust flue installation. Electrical demand stays moderate at 120V single-phase with 18.7 to 30 amp breaker sizing. The 30-inch height, 21-inch width and depth fit most utility closets and basements. Refrigerant lines use standard 3/8-inch liquid and 3/4-inch suction sizing with 30 feet of included insulation. Professional installation is strongly recommended for proper evacuation, charge, and airflow balance.

Warranty & Reliability

Goodman provides 10 years of parts coverage when registered online, protecting both the air conditioner and furnace components equally. This warranty is solid for the price point but shorter than some competitors offering 12-year coverage. Registration is required and typically quick through Goodman's website. Labor costs beyond parts remain the buyer's responsibility, and claims require proof of professional installation.

Specifications

SKU	LS38343830
Brand/Manufacturer	Online Supply
Cooling BTU	36,000
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)	35.000000
Feature	Spec
Energy Star	No
SEER1 (Efficiency)	14
Condenser Stages	Single Stage
Compressor Type	Scroll
Liquid Line	3/8"
Suction Line	3/4"
Liquid Valve Size	3/8"
Suction Valve Size	3/4"
Max Breaker Size	30 Amps
Min. Breaker Size	18.7 Amps
Tonnage	3.5 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.
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
Style	A-Coil
Suction Line Insulation Thickness	3/4"
Length	30 feet

Frequently Asked Questions

How does 14 SEER compare to newer air conditioners? +

14 SEER is respectable but behind current premium equipment. 16-18 SEER units cost 20-30% more but reduce cooling costs by 10-15% annually. For 8-10 year ownership, 14 SEER makes financial sense. Beyond ten years, higher SEER pays back through energy savings alone.

Will this system work with my existing ductwork? +

The 3-ton, 36,000 BTU cooling capacity suits homes sized for 3-ton systems. Maximum 2000 CFM airflow requires ducts designed for that volume. Undersized or blocked ducts reduce efficiency dramatically. Have a contractor evaluate your existing ductwork before purchasing.

Why is 80% AFUE furnace efficiency so low? +

80% AFUE means 20% of gas energy vents as waste heat up the flue. Modern 95% AFUE condensing furnaces recapture that heat. The cost difference is $800-1200 upfront, but 95% AFUE saves roughly $150-300 yearly in heating costs depending on climate and usage.

Is this a good choice compared to Lennox or Carrier? +

Goodman competes on price, not brand prestige. Lennox 14 SEER units cost 15-25% more for similar capacity. Carrier equivalents are also pricier. Reliability is comparable across all three for basic equipment. If budget is tight, Goodman delivers solid performance for the money.

Do I need to register the warranty online? +

Yes, registration is required for the full 10-year coverage to activate. Without registration, coverage drops significantly. Registration is free and completed through Goodman's website with your purchase receipt and serial number.

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