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

// Bottom Line

This Goodman package delivers practical efficiency without premium pricing, making it ideal for replacement projects in moderate climates where contractors need reliable baseline performance. Best suited for homeowners upgrading from older 10-13 SEER systems who want measurable efficiency gains without top-tier costs.

Review

This 3-ton Goodman package arrives as a straightforward, middle-of-the-road HVAC solution targeting contractors and homeowners who prioritize reliability over cutting-edge specs. The system combines 36,000 cooling BTU with 100,000 heating BTU in horizontal A-coil configuration, making it adaptable to various installation scenarios. Goodman has long held credibility in the light commercial and residential space, and this unit maintains that brand reputation without pretending to be premium-tier equipment.

Performance numbers tell a practical story: 14 SEER cooling efficiency delivers meaningful improvements over legacy systems, while the 80% AFUE furnace provides adequate heating without premium gas costs. The scroll compressor handles 36,000 BTU cooling, the two-stage burner modulates heating output, and the multi-speed blower pushes 2,000 CFM maximum. At 73 dB, noise levels are moderate for outdoor condenser operation. The system runs on R410A or R22 refrigerant and requires 120V, 1-phase 60Hz service with 18.7 to 30-amp breaker capacity.

Pros & Cons

Pros

14 SEER rating delivers real cooling efficiency improvements, typically 20-30% better than 10 SEER legacy units
Two-stage burner on furnace side provides modulating heat output, improving comfort and reducing short-cycling
80% AFUE efficiency is solid for mid-range gas furnaces, meeting modern minimum standards
Multi-speed blower motor optimizes airflow delivery across varying load conditions
Scroll compressor is proven workhorse technology with good reliability track record
36,000 cooling BTU and 100,000 heating BTU handle 3-ton loads appropriately

Cons

Single-stage condenser is less efficient than two-stage units, limiting part-load efficiency in mild weather
80% AFUE trails high-efficiency models running 90-95%, meaning higher gas bills than premium alternatives
No ENERGY STAR certification, indicating it meets base standards but not top-tier recognition
73 dB noise level is moderately loud for outdoor operation, notable in quiet residential areas

Who Should Buy

Best For

Contractors managing budget-conscious replacement projects and homeowners in mixed climates seeking reliable baseline performance without premium investment. This system works particularly well for modest-sized homes replacing aging 10-13 SEER equipment where efficiency gains are immediately noticeable.

Consider Alternatives If

Homeowners in extreme climates requiring maximum efficiency, those prioritizing lowest operating costs, or premium-conscious buyers expecting ENERGY STAR certification and quieter operation.

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

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Installation

Installation follows standard horizontal/upflow configuration with A-coil design. Line sets include 3/8-inch liquid and 3/4-inch suction copper, with matching valve sizes. Suction line insulation comes pre-wrapped at 3/4-inch thickness. Metal exhaust flue required for furnace venting. Unit dimensions of 34.5-inch height, 21-inch width, and 28.75-inch depth fit typical attic and basement spaces. Total weight is 35 pounds, manageable for two-person installation.

Warranty & Reliability

Goodman backs this system with a 10-year warranty requiring online registration. This covers parts and labor during the specified period, providing decent protection for a mid-range unit. Ten years is solid baseline coverage in the industry. Registration is mandatory to activate the full term, so documentation is important at point of installation.

Specifications

SKU	LS38343830
Brand/Manufacturer	Online Supply
Cooling BTU	36,000
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)	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	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 Goodman Warranty 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
Style	A-Coil
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Metal
Furnace Efficiency / AFUE	80%
Blower Motor	Multi-Speed
Maximum CFM	2000
Burner Stages	Two
Fuel Type	Gas
Suction Line Insulation Thickness	3/4"
Length	30 feet

Frequently Asked Questions

How does 14 SEER cooling efficiency compare to what I have now? +

If replacing a 10 SEER unit, expect approximately 20-40% lower cooling costs depending on climate and usage patterns. If your current system is 13 SEER, savings are more modest around 7-8%. SEER ratings measure steady-state efficiency, so real-world savings vary with seasonal temperature swings and system run time.

Can this replace my existing ductwork and outdoor unit? +

This unit works with compatible existing indoor coil housing and outdoor line set connections. However, older ductwork sized for lower-capacity units may need evaluation. Maximum CFM output is 2,000, so ducts must support that capacity. Have an HVAC tech measure existing ductwork before committing.

Is 80% AFUE adequate for my heating needs? +

80% AFUE is code-compliant and efficient for gas furnaces in most climates. It means 80 cents of heating energy reach your home per dollar spent. Premium models reach 95% AFUE, costing more upfront but lowering gas bills. For moderate climates, 80% balances initial cost against operating expense reasonably well.

How does this Goodman compare to other brands at the same price point? +

Goodman competes directly with Daikin, Lennox, and Carrier models at equivalent SEER/AFUE ratings. Goodman typically costs slightly less while delivering comparable component quality and reliability. You sacrifice brand prestige and marginally faster service response for lower purchase price. Warranty terms are standard across this tier.

What does the 10-year warranty cover if something fails? +

The warranty covers defective parts and labor repairs during the ten-year period from online registration. Normal wear items and refrigerant charges may have exclusions. Read the detailed warranty document carefully, as coverage specifics vary by component type and failure cause.

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