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

// Bottom Line

This Goodman system works well for homeowners replacing aging equipment or contractors building affordable packages in moderate climates. The 14 SEER cooling efficiency and 80% AFUE heating rating hit the sweet spot between performance and cost, making it practical for budget-conscious buyers who don't need premium features.

Review

The Goodman 3.5-ton gas furnace and air conditioner combination represents a practical middle ground in the residential HVAC market. This upflow-configured system combines a 100,000 BTU furnace with 42,000 BTU cooling capacity in one integrated package. Goodman's reputation for straightforward design and parts availability makes this a reliable choice for contractors and homeowners alike. The system arrives ready for professional installation with all necessary valve connections and refrigerant lines included.

Performance numbers show competent engineering without cutting corners. The 14 SEER cooling efficiency rating meets modern minimum standards, while the 80% AFUE furnace with dual-stage burners handles heating effectively across temperature ranges. The high-efficiency multi-speed blower delivers up to 2000 CFM, adapting airflow to actual demand rather than running at full blast constantly. These specs translate to comfortable operation and reasonable utility costs, though not the ultra-low bills premium systems provide.

Pros & Cons

Pros

14 SEER rating delivers solid cooling efficiency without premium pricing
80% AFUE gas furnace with two-stage burner handles variable heating loads effectively
High-efficiency multi-speed blower motor optimizes comfort across seasons at 2000 CFM maximum
42,000 BTU cooling capacity pairs well with 100,000 BTU heating for balanced seasonal performance
10-year warranty with online registration provides reasonable long-term protection

Cons

80% AFUE trails high-efficiency models, meaning higher heating costs over time
Single-stage condenser cannot modulate cooling capacity, reducing efficiency in mild weather
73 dB noise level runs louder than variable-speed competitors, noticeable in quiet settings
Not Energy Star certified despite decent SEER rating

Who Should Buy

Best For

Homeowners in areas with moderate heating and cooling seasons who prioritize upfront affordability over premium efficiency will appreciate this system. Contractors assembling value packages for price-sensitive customers will find the Goodman brand reliability and standard specifications straightforward to install and support.

Consider Alternatives If

Skip this unit if you live in extreme climates, need Energy Star certification, or want the quietest operation available from modern systems.

3.5 Ton 14 SEER 80% AFUE 100,000 BTU Goodman Gas F

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Installation

This unit requires standard HVAC installation with 120V, 60Hz single-phase power and a 22 to 35-amp breaker. The system uses R410A refrigerant and includes 3/8-inch liquid and 7/8-inch suction line connections. Upflow configuration demands proper return air ducting and exhaust venting through metal flue. Most qualified contractors complete installation in one day without complications.

Warranty & Reliability

Goodman backs this system with a 10-year parts warranty upon online registration. This coverage protects against compressor failure, motor issues, and component defects during the critical first decade of operation. Registration is simple and extends coverage significantly beyond standard limited warranties, making it worth completing immediately after installation.

Specifications

SKU	LS38783830
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)	30.000000
Feature	Spec
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
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
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 the 14 SEER rating compare to modern air conditioners? +

14 SEER meets current federal minimum standards and performs adequately in moderate climates. Higher-end units reach 16-18 SEER, reducing electric bills by 15-25% more but costing significantly more upfront. For homeowners in temperate regions, 14 SEER delivers excellent value without premium pricing.

Will this furnace work with my existing ductwork? +

Yes, assuming your ducts are sized for upflow delivery and return air is adequate. The 2000 CFM maximum output fits standard residential installations. Have a professional verify your ductwork can handle 100,000 BTU heating output before committing to purchase.

Does the two-stage burner actually save energy compared to single-stage? +

Yes, measurably. Two-stage burners run at reduced capacity during mild weather, reducing cycling losses and improving efficiency. On 50-degree heating days, you'll notice quieter operation and lower gas consumption than constant full-fire systems.

Is 80% AFUE furnace efficiency outdated in 2024? +

Not for this price point. High-efficiency models reach 95-98% AFUE but cost 50-100% more. If your furnace runs 8-10 months yearly, the gas savings from upgrading to 95% AFUE may take 12-15 years to recoup. 80% remains practical for many homeowners.

What does the 10-year warranty actually cover? +

Parts only, including compressor, motors, and heat exchangers. Labor costs and refrigerant are not included. Registration must be completed within 30 days of installation to activate full coverage.

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