3 Ton 15 SEER 97% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This system is ideal for homeowners upgrading from older single-stage furnaces who want measurable energy savings and quieter operation. The 97% AFUE rating and modulating burner deliver real fuel cost reductions, especially in colder climates where heating loads are heavy.

Review

The Goodman 3 Ton 15 SEER 97% AFUE gas furnace and air conditioner system represents a solid mid-tier option for residential HVAC replacement. Branded through Online Supply with AHRI certification 7424267, this upflow A-coil configuration suits most standard installation environments. The unit delivers 100,000 BTU heating output and 34,800 BTU cooling capacity, making it appropriately sized for homes between 1,200 and 2,000 square feet.

Efficiency numbers here tell the real story. The furnace achieves 97% AFUE through a modulating burner that scales output between stages rather than cycling on and off, reducing energy waste. The variable-speed ECM blower motor adjusts airflow from 0 to 2,000 CFM based on demand, avoiding the constant full-speed operation of older motors. Cooling efficiency registers at 16 SEER1 with R410A refrigerant and a scroll compressor, delivering ENERGY STAR compliance without premium pricing.

Pros & Cons

Pros

97% AFUE furnace efficiency exceeds most competitor offerings and translates to lower monthly heating bills
Modulating burner stages output to match actual heating demand, reducing short cycling and wear
Variable-speed ECM blower motor runs more efficiently than fixed-speed alternatives and quieter at part load
ENERGY STAR certified with 16 SEER1 cooling rating ensures year-round efficiency
Plastic PVC exhaust flue allows flexible routing and simpler installation versus metal venting

Cons

Single-stage air conditioner limits cooling efficiency on extreme heat days compared to two-stage units
73.5 dBA noise level is moderate, not the quietest option for sound-sensitive locations
Scroll compressor is durable but less efficient under partial loads than variable-displacement designs

Who Should Buy

Best For

Contractors and homeowners in moderate to cold climates seeking a reliable mid-range efficiency upgrade. The modulating furnace and variable-speed blower suit homes with variable heating loads and occupancy patterns.

Consider Alternatives If

Budget-conscious buyers seeking lowest upfront cost should evaluate single-stage alternatives, and those prioritizing maximum cooling capacity in hot climates may want a two-stage air conditioner.

3 Ton 15 SEER 97% AFUE 100,000 BTU Goodman Gas Fur

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Installation

This unit requires standard 115V single-phase 60 Hz power with breaker sizing between 18.7 and 30 amps. The upflow configuration and A-coil design fit typical attic or basement installations. PVC exhaust flue eliminates metal venting costs and simplifies routing. Suction and liquid lines measure 7/8 inch and 3/8 inch respectively, with 3/4 inch insulation pre-applied.

Warranty & Reliability

Goodman backs this system with a 10-year warranty when registered online. Coverage typically includes parts and compressor protection, though homeowners should verify specific terms with the installer. Registration is straightforward and highly recommended to activate full coverage periods.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	34,800
Heating BTU	100,000
Refrigerant	R410A
Electrical	115 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	73.5
Weight (in lbs)	30.000000
Feature	Spec
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	30 amps
Min. Breaker Size	18.7 amps
Tonnage	3.5 Ton
Height	34.5"
Width	21"
Depth	28.75"
Resources	Goodman Brochure Goodman Specifications 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	7/8"
Style	A-Coil
AHRI Certificate Number	7424267
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Product Features	Rebate Available
Furnace Efficiency / AFUE	97%
Blower Motor	Variable Speed - ECM
Maximum CFM	2000
Flue Location	Right
Burner Stages	Modulating
Fuel Type	Propane, Natural Gas
Suction Line Insulation Thickness	3/4"
Length	50 feet

Frequently Asked Questions

What does 97% AFUE actually save compared to older 80% furnaces? +

A 97% AFUE furnace converts 97 cents of every fuel dollar to heat, versus 80 cents in older models. On a $1,500 annual heating bill, you save approximately $255 yearly. Payback occurs within 4-6 years for many homeowners, with savings continuing for the 15-20 year lifespan.

Will the modulating burner work with my existing thermostat? +

The modulating burner functions with standard thermostats but performs best with programmable or smart thermostats that anticipate temperature changes. Your installer should verify compatibility. Older mechanical thermostats work acceptably but won't optimize the furnace's part-load efficiency benefits.

How does the variable-speed blower reduce energy use? +

The ECM blower ramps speed proportionally to heating demand rather than running full blast constantly. In mild weather, it operates at 40-60% capacity, cutting motor energy consumption by roughly 60-70%. This also reduces noise and extends blower motor lifespan significantly.

Is single-stage air conditioning adequate for hot climates? +

Single-stage cooling works fine in moderate climates but struggles with sustained 95-plus degree heat. Two-stage units modulate compressor capacity and maintain better humidity control. For hot-climate homes, stepping up to a two-stage condenser is often worth the additional investment.

What happens if I don't register the warranty online? +

Without registration, coverage may default to shorter periods or exclude certain components. Goodman makes registration fast, typically 5-10 minutes online. Proof of installation date is usually required, so register promptly after professional installation.

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