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

// Bottom Line

Best for homeowners in mild-to-moderate climates seeking a reliable split system without premium pricing. The 16 SEER2 cooling efficiency and two-stage burner provide year-round comfort at a reasonable entry point for Goodman equipment.

Review

Goodman's 3-ton upflow system delivers a balanced approach to whole-home climate control, combining respectable cooling capacity with dependable heating. This A-coil configuration suits attic installations or tight utility closets where vertical space is limited. At the entry level of Energy Star certification, it appeals to homeowners upgrading from 10-to-13 SEER units without stretching budgets toward premium tiers.

Cooling output reaches 34,800 BTU with 16 SEER2 efficiency, translating to roughly 15% lower summer electricity use versus baseline units. Heating delivers 100,000 BTU at 80% AFUE, meaning 20 cents of every heating dollar becomes wasted energy compared to 95% AFUE alternatives. The variable-speed blower and dual-stage burner enable part-load operation, reducing runtime waste during shoulder seasons when full capacity isn't needed.

Pros & Cons

Pros

16 SEER2 cooling efficiency earns Energy Star certification, reducing summer energy costs
Two-stage burner allows modulated heating, improving comfort and reducing short-cycling in moderate weather
Variable-speed blower motor with 2000 CFM capacity optimizes airflow across different load conditions
Scroll compressor is field-proven for durability with fewer moving parts than reciprocating designs
R410A and R22 refrigerant compatibility provides upgrade flexibility for existing systems

Cons

80% AFUE furnace efficiency is competent but falls short of 90%+ AFUE high-efficiency models available at similar price points
Single-stage cooling compressor cannot modulate capacity, meaning less precise temperature control than two-stage units
73.5 dB noise level is audible during operation, particularly noticeable in quiet residential areas

Who Should Buy

Best For

Homeowners replacing aging systems in moderate climates where cooling and heating are both needed regularly. Contractors who need reliable Goodman equipment for budget-conscious customers prioritizing efficiency gains over premium features.

Consider Alternatives If

Those in very cold climates requiring 95%+ AFUE furnaces, or homeowners seeking variable-capacity cooling for maximum comfort and lowest noise operation.

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

Buy at HVACDirect →

Installation

Installation requires standard 120V, 60Hz single-phase power with a 30-amp maximum breaker. Upflow configuration fits most residential furnace closets with 34.5-inch height and 21-inch width. Suction and liquid lines use 7/8-inch and 3/8-inch connections respectively, with 3/4-inch insulation on suction lines to prevent condensation. Metal exhaust flue is mandatory for gas combustion venting.

Warranty & Reliability

Goodman provides 10-year parts coverage with online registration, protecting against manufacturing defects in compressor, coil, and control board failures. Labor and refrigerant are excluded. Registration is straightforward but required, so homeowners must complete it within 30 days of installation to activate full coverage.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	34,800
Heating BTU	100,000
Refrigerant	R410A or R22
Electrical	120 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	73.5
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	5 Ton
Height	34.5"
Width	21"
Depth	28.75"
Resources	Goodman Brochure Goodman Installation Instructions Goodman Parts Manual Goodman Service Manual 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
Liquid Line	3/8"
Suction Line	7/8"
Style	A-Coil
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Metal
Furnace Efficiency / AFUE	80%
Blower Motor	Variable Speed
Maximum CFM	2000
Burner Stages	Two
Fuel Type	Propane, Natural Gas
Suction Line Insulation Thickness	3/4"
Length	50 feet

Frequently Asked Questions

How does 16 SEER2 compare to older SEER ratings on my current system? +

SEER2 uses stricter testing conditions reflecting real-world operation better than legacy SEER ratings. A 16 SEER2 unit is roughly equivalent to 19-20 SEER, so expect meaningful efficiency gains if your current system is 10+ years old. Energy Star certification confirms above-average performance.

Is this system compatible with my existing ductwork and thermostat? +

Yes, standard residential ductwork designed for 3-ton systems will work. Ensure your thermostat supports variable-speed blower operation and two-stage heating for full functionality. If upgrading from a different capacity, ducts may need balancing to optimize airflow distribution.

What's the difference between single-stage and two-stage cooling on this unit? +

This model has single-stage cooling, meaning the compressor runs full power or off. Two-stage units modulate cooling capacity in partial load, improving comfort and efficiency. Single-stage is adequate for moderate climates but less precise in very hot or variable weather.

How does 80% AFUE furnace efficiency affect my heating bills compared to 95% AFUE? +

At 80% AFUE, roughly 15-20% of heating energy is lost. On a 60,000 annual heating cost, that's 9,000 to 12,000 in wasted dollars. A 95% AFUE unit costs more upfront but saves 50 to 75 monthly in cold climates over 15 years.

Does online registration really matter for the 10-year warranty? +

Yes. Goodman requires registration within 30 days to activate the full 10-year coverage. Without registration, coverage defaults to shorter terms. Registration takes five minutes online using your model and serial numbers.

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