3 Ton 15 SEER 96% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Horizontal Review 2026

// Bottom Line

This horizontal-configuration system works best for homeowners upgrading 3 to 3.5-ton capacity in homes with basement or attic space constraints. The 96% AFUE heating efficiency and 16 SEER2 cooling make it a solid choice for moderate climates where both seasons matter equally.

Review

This Goodman 3.5-ton horizontal system represents a practical mid-range choice for homeowners balancing heating and cooling needs. The 80,000 BTU furnace paired with 34,800 BTU cooling capacity makes it suitable for homes in 2,500 to 3,500 square feet. Goodman maintains a solid reputation among contractors for durability, and this unit's horizontal design addresses installation constraints many homeowners face in basements or attics.

Performance metrics here are genuinely strong. The 96% AFUE furnace efficiency sits in the high-efficiency bracket, meaning winter heating costs drop noticeably compared to older 80% systems. Cooling arrives at 16 SEER2, outpacing the advertised 15 SEER specification. The variable-speed ECM blower motor adapts to demand, maintaining whisper-quiet operation at 73.5 dB while pushing up to 1,600 CFM. Two-stage heating prevents short cycling, particularly valuable in variable outdoor temperatures.

Pros & Cons

Pros

96% AFUE furnace efficiency delivers exceptional heating performance with 80,000 BTU output, reducing winter utility costs significantly
16 SEER2 cooling rating exceeds the 15 SEER specified, providing better-than-advertised summer efficiency
Variable-speed ECM blower motor optimizes airflow up to 1,600 CFM while reducing noise to 73.5 dB
Two-stage burner prevents short cycling and maintains consistent heating comfort
Energy Star certified with 10-year warranty including free online registration protection

Cons

Horizontal configuration limits placement options, though it fits tight spaces, it's not suitable for vertical installations
Single-stage compressor means the cooling system works at full capacity or off, lacking the efficiency of variable-speed cooling
Refrigerant compatibility with both R410A and R22 may complicate future service if technicians aren't careful about system identification

Who Should Buy

Best For

Homeowners in mixed climates upgrading older systems who have basement or attic horizontal space available and want reliable heating and cooling without premium pricing. Contractors installing in tight spaces will appreciate the horizontal footprint.

Consider Alternatives If

Anyone needing variable-capacity cooling for extreme climates, homes with vertical-only installation space, or those expecting a premium smart-enabled system should explore alternatives.

3 Ton 15 SEER 96% AFUE 80,000 BTU Goodman Gas Furn

Buy at HVACDirect →

Installation

This unit requires standard horizontal installation with downflow/horizontal airflow orientation. The 115V single-phase 60Hz electrical requirement keeps installation straightforward, needing only 18.7 to 30-amp breaker support. PVC exhaust flue compatibility is mandatory. Suction and liquid line sizes measure 7/8 inch and 3/8 inch respectively, with 50-foot suction line insulation included. Most HVAC contractors complete installation in one to two days.

Warranty & Reliability

Online Supply backs this unit with a 10-year parts warranty following online registration. Registration is straightforward and extends coverage significantly compared to standard limited warranties. The warranty covers manufacturing defects but excludes labor and refrigerant costs. Goodman's track record supports component longevity, making this warranty meaningful rather than merely promotional.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	34,800
Heating BTU	80,000
Refrigerant	R410A or R22
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	21"
Width	21.125"
Depth	26"
Resources	CHPF Installation Manual CHPF 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.
AHRI Certificate Number	7368843
Airflow Direction	Downflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Product Features	Rebate Available
Furnace Efficiency / AFUE	96%
Blower Motor	Variable Speed - ECM
Maximum CFM	1600
Configuration	Horizontal
Burner Stages	Two
Fuel Type	Propane, Natural Gas
Liquid Line	3/8"
Suction Line	7/8"
Style	A-Coil
Suction Line Insulation Thickness	3/4"
Length	50 feet

Frequently Asked Questions

Can this unit operate on propane or natural gas? +

Yes, this furnace operates on both propane and natural gas. You'll specify fuel type during installation by adjusting burner components. Dual-fuel capability makes relocation easier if you move to a different gas infrastructure. Always verify your home's gas line capacity with an HVAC technician before assuming either fuel works.

What's the actual cooling capacity compared to the tonnage rating? +

The system is rated 3.5 tons but delivers 34,800 BTU cooling output. Technically, 3.5 tons equals 42,000 BTU, so this unit delivers roughly 83% of nameplate capacity. This discrepancy is common and reflects real-world efficiency ratings. The 16 SEER2 rating accounts for this actual output, not theoretical maximum.

Is 16 SEER2 significantly better than the advertised 15 SEER? +

Yes, 16 SEER2 represents approximately 6-8% better cooling efficiency than 15 SEER. Over a 15-year lifespan, this translates to real summer energy savings. The rating actually exceeds what the marketing claims, making it solid value for efficiency-focused buyers.

How does the variable-speed blower compare to single-speed models? +

The ECM variable-speed blower adjusts motor speed based on heating or cooling demand, not running constantly at full power. This reduces electricity consumption by 15-25% annually compared to fixed-speed designs, lowering utility bills and extending equipment life through reduced wear cycles.

Does the 10-year warranty cover compressor failures? +

Yes, the 10-year warranty covers compressor manufacturing defects. Registration is required to activate coverage. Labor and refrigerant charges apply separately. Check warranty documentation carefully regarding coverage conditions and exclusions.

Affiliate disclosure: IndustrialRank earns a commission on qualifying purchases at no extra cost to you. We only recommend products we have independently reviewed.