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

// Bottom Line

This Goodman system works best for budget-conscious homeowners upgrading older equipment or contractors handling volume installations where ENERGY STAR certification matters. The 80% AFUE and 15 SEER rating deliver respectable efficiency gains without the premium price tag of high-efficiency models.

Review

The Goodman 3 Ton 15 SEER system occupies a sweet spot in the mid-market HVAC landscape. This upflow configuration pairs an 80,000 BTU furnace with a 3.5 ton air conditioning condenser rated for 34,800 BTU cooling capacity. Manufactured by Goodman and distributed through Online Supply with SKU LS38783850, this unit targets contractors and homeowners seeking balanced performance and affordability without cutting corners on basic efficiency standards.

Performance metrics reveal a competent, if not exceptional, system. The furnace achieves 80% AFUE through two-stage burner technology, meaning about 80 cents of every heating dollar produces usable heat. The air conditioner delivers 15 SEER cooling efficiency, qualifying for ENERGY STAR status. The variable-speed blower motor operating up to 2000 CFM helps modulate airflow efficiently. Cooling and heating work together on R410A refrigerant with a scroll compressor, providing reliable operation across most residential applications.

Pros & Cons

Pros

80,000 BTU furnace with two-stage burners provides responsive heating and better temperature control than single-stage alternatives
Variable-speed blower motor with 2000 CFM maximum reduces energy waste during partial-load operation
15 SEER cooling efficiency exceeds many budget models, translating to lower summer operating costs
Two-stage burner configuration allows the furnace to run at lower output 80% of the time, improving comfort and reducing short-cycling
Compact footprint at 30x21x21 inches fits most existing furnace closets without major ductwork modifications
ENERGY STAR rated with 10-year warranty, providing peace of mind for residential installations

Cons

80% AFUE falls short of high-efficiency 95%+ models, meaning higher heating costs over the system's 15-20 year lifespan
Single-stage condenser limits cooling efficiency optimization compared to variable-capacity units
73.5 dB noise level is noticeably louder than inverter-drive compressor systems, especially during peak cooling

Who Should Buy

Best For

Homeowners in moderate climates replacing 15-20 year old furnaces or those with tight budgets who want ENERGY STAR efficiency without premium pricing. Contractors installing multiple units for rental properties or builders will appreciate the $2700 price point and proven Goodman reliability.

Consider Alternatives If

Homes in extreme climates requiring maximum heating output should look at 95% AFUE systems, and buyers prioritizing quiet operation should consider scroll compressors with variable-capacity staging.

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

$2700

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Installation

This upflow unit requires standard 208/230V, single-phase 60 Hz electrical service with minimum 18.7 amp breaker capacity and maximum 30 amp breaker compatibility. Installation demands metal exhaust flue requirements and proper line set sizing using the included 3/8 inch liquid line and 7/8 inch suction line with 3/4 inch insulation rated for 50-foot maximum runs. Professional HVAC installation remains essential for AHRI certification and warranty validity.

Warranty & Reliability

Online Supply provides a 10-year parts and labor warranty upon registration, covering manufacturing defects in the furnace and condenser components. This is standard for mid-tier Goodman equipment and offers solid protection, though it falls short of extended 12-15 year warranties available on premium brands. Keep documentation and registration confirmation for any future claims.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	34,800
Heating BTU	80,000
Refrigerant	R410A or R22
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
AHRI Certificate Number	204633302
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	CAPF Installation Manual CAPF 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	3.5 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 is this unit rated 3.5 ton for cooling but labeled as 3 ton? +

The nominal 3 ton rating reflects the furnace blower capacity, while the 3.5 ton condenser provides slightly enhanced cooling. This pairing ensures the air handler can fully utilize the condenser's 34,800 BTU capacity without undersizing. Verify your AHRI certificate number 204633302 when commissioning for exact matched performance.

Can I install this in an existing upflow or downflow cabinet? +

Yes, the unit supports both upflow and downflow configurations per the spec sheet. However, verify your existing ductwork and return air paths match your installation direction. The 30x21x21 inch dimensions fit most standard utility closets. Have your installer confirm proper airflow patterns before sealing everything up.

How much will this system save me on heating costs compared to my old furnace? +

An 80% AFUE system saves roughly 10-15% on heating bills versus older 60-70% AFUE units, depending on climate and fuel type. Natural gas runs cheaper per BTU than propane in most regions. Annual savings typically range from $150-400 in moderate climates, meaning payback occurs within 8-12 years even at $2700 all-in cost.

Should I upgrade to a 95% AFUE high-efficiency system instead? +

High-efficiency furnaces cost $1000-1500 more upfront but save only $100-200 annually over 80% AFUE. In moderate climates with moderate heating seasons, the payback exceeds 10 years. Choose 95% AFUE if you plan to stay 20+ years or live in very cold climates. Otherwise, this 80% unit delivers better short-term value.

What does the 10-year warranty actually cover? +

Coverage includes manufacturing defects in the furnace heat exchanger, blower motor, and air conditioner compressor and coil. It excludes damage from improper installation, lack of maintenance, electrical surges, or refrigerant leaks caused by installer error. Always register within 30 days of installation to activate the warranty.

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