3 Ton 15 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This 3-ton Goodman system is ideal for homeowners upgrading older equipment or contractors building affordable HVAC packages without sacrificing efficiency. The 80% AFUE furnace and 15 SEER air conditioner combo delivers solid performance at a competitive price point, especially for residential applications in moderate climates.

Review

The Goodman 3-ton gas furnace and air conditioner system represents a middle ground in the residential HVAC market. This upflow configuration suits most residential installations where space allows vertical equipment placement. Online Supply positions this unit as an affordability play, and the specs back that claim, though there are some notable tradeoffs versus premium alternatives that merit careful consideration.

Cooling capacity runs at 34,800 BTU with SEER16 efficiency and R410A refrigerant in a single-stage scroll compressor. The furnace delivers 100,000 BTU heating output at 80% AFUE with two-stage burner operation and a variable-speed motor capable of 2000 CFM maximum airflow. This configuration achieves ENERGY STAR certification, though the 80% AFUE sits below modern high-efficiency standards that typically reach 90-95% efficiency.

Pros & Cons

Pros

SEER rating of 16 on the air conditioner side exceeds the 15 SEER spec, offering slightly better cooling efficiency than advertised
Variable-speed blower motor provides better air distribution and humidity control compared to single-speed alternatives
Dual-fuel capability handles both natural gas and propane, giving installation flexibility for rural or off-grid properties
Two-stage burner operation reduces short-cycling and improves comfort during partial-load heating conditions
10-year warranty with online registration covers compressor and components, standard for the Goodman brand

Cons

80% AFUE is below modern high-efficiency standards, 5-10 percentage points lower than 90+ AFUE systems that qualify for energy rebates
Inconsistency between spec sheet specs (3 ton cooling) and actual tonnage rating (5 ton listed) creates confusion about true capacity
Single-stage compressor limits part-load efficiency during mild weather when the system runs at full capacity unnecessarily

Who Should Buy

Best For

Budget-conscious homeowners in moderate climates or contractors specifying equipment for multi-family and rental properties where upfront cost matters more than long-term energy savings. This system also works well for properties with propane heating where gas furnace options are limited.

Consider Alternatives If

Homeowners in cold climates seeking maximum heating efficiency or anyone prioritizing 20-year lifecycle cost savings over purchase price should explore 90+ AFUE furnaces and 18+ SEER systems.

3 Ton 15 SEER 80% AFUE 100,000 BTU Goodman Gas Fur

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Installation

The upflow/horizontal configuration fits standard utility closets and basements in most residential homes. Requires 208/230V single-phase power, 60 Hz service. Metal exhaust flue is mandatory for venting. A-coil evaporator arrives with 50 feet of lineset including 3/4-inch suction line insulation. Professional installation is recommended, particularly for refrigerant charging and ductwork balancing.

Warranty & Reliability

Goodman provides 10 years of parts coverage when you register online within 30 days of purchase. This covers compressor failure, which represents the largest potential repair expense. The evaporator coil carries separate warranty coverage. Registration is straightforward but mandatory to activate full protection, so document your purchase immediately.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	34,800
Heating BTU	100,000
Refrigerant	R410A
Electrical	208 / 230 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	73.5
Weight (in lbs)	30.000000
Feature	Spec
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Metal
Furnace Efficiency / AFUE	80%
Blower Motor	Variable Speed
Maximum CFM	2000
Configuration	Upflow / Downflow
Burner Stages	Two
Fuel Type	Propane, Natural Gas
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.
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	5 Ton
Liquid Line	3/8"
Suction Line	7/8"
Style	A-Coil
Suction Line Insulation Thickness	3/4"
Length	50 feet

Frequently Asked Questions

Why does the spec sheet say 3 ton but also list 5 ton tonnage? +

This appears to be a spec sheet error. The 34,800 BTU cooling output equals approximately 2.9 tons, matching the 3-ton system description. The 5-ton notation is likely a copy-paste error from another product listing. Verify with Online Supply before purchase to confirm actual cooling capacity for your installation.

Can this furnace handle both natural gas and propane? +

Yes, the burner accommodates both fuel types. However, conversion from one to the other requires technical adjustment and should only be performed by a qualified technician. The installed configuration depends on your home's available fuel supply at time of installation.

How does 80% AFUE compare to other furnaces on the market? +

80% AFUE is entry-level efficiency. Mid-range systems deliver 90-92% AFUE, while premium models reach 95-98% AFUE. You'll recoup the higher cost through lower heating bills over 15-20 years, though upfront savings here are significant for budget installations.

Is the variable-speed blower worth the upgrade over single-speed? +

Yes. Variable-speed motors run at lower speeds during mild weather, reducing energy consumption and noise. Single-speed alternatives run full blast constantly, wasting energy and creating comfort issues. The variable-speed option here is a meaningful efficiency advantage.

What electrical service do I need for this system? +

System requires 208/230V, single-phase, 60 Hz power. Minimum breaker is 18.7 amps, maximum 30 amps. Confirm your home has available capacity before ordering. Undersized electrical service means expensive upgrades before installation can proceed.

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