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

// Bottom Line

This Goodman system delivers solid efficiency at under $2,100, making it ideal for budget-conscious homeowners replacing aging equipment or contractors stocking standard residential replacements. The 80% AFUE furnace paired with a 15 SEER air conditioner handles heating and cooling duties capably without premium pricing.

Review

Goodman's 3.5-ton system sits in the practical middle of the residential HVAC market. At $2,053, it undercuts premium brands while maintaining Energy Star certification and solid component quality. The upflow configuration suits most retrofit installations, and the 48-pound weight makes handling manageable. This is the kind of unit contractors install dozens of times yearly because it balances performance, price, and reliability without demanding premium installation support.

Heating capacity reaches 80,000 BTU with two-stage burner operation, delivering 80% AFUE efficiency through modulated combustion. Cooling pulls 42,000 BTU at 15 SEER using an R410A/R22 scroll compressor in single-stage configuration. The variable-speed blower adapts airflow from minimal to 2,000 CFM, though the 73 dB output during operation is noticeable in quiet homes. Real-world performance trades some efficiency gains for straightforward, proven technology that repair technicians know inside-out.

Pros & Cons

Pros

Energy Star certified with 80% AFUE furnace efficiency and 15 SEER cooling rating
Variable-speed blower motor with 2,000 CFM maximum airflow for balanced comfort
Two-stage burner allows modulated heating, reducing energy waste on mild days
Compact 30x21x21 inch A-coil design fits tight closets and utility spaces
10-year warranty with online registration provides solid manufacturer coverage
AHRI certified (204633302) ensures verified performance data

Cons

73 dB noise level is moderately loud, noticeable during single-stage cooling operation
80% AFUE is baseline efficiency, not high-efficiency like 95%+ models
Single-stage cooling compressor lacks modulation, cycling on-off rather than varying capacity
Requires 23.5 to 40-amp breaker, standard but confirms 120V single-phase service

Who Should Buy

Best For

Homeowners in moderate climates needing straightforward furnace and AC replacement at fair pricing, or contractors building inventory for standard residential jobs. This system works well for homes under 2,000 square feet where baseline efficiency meets typical utility budgets.

Consider Alternatives If

Buyers in extreme climates seeking maximum efficiency, those wanting whisper-quiet operation, or homeowners who can swing higher budgets for high-efficiency models with variable-capacity compressors.

3.5 Ton 15 SEER 80% AFUE 80,000 BTU Goodman Gas Fu

$2053

Buy at HVACDirect →

Installation

Installation demands standard tools and refrigerant certification. The unit accepts 3/8-inch liquid and 1 1/8-inch suction lines with 50 feet of included suction insulation at 1/2-inch thickness. Metal flue is required for exhaust, and electrical work needs 23.5 to 40-amp breaker service at 120V single-phase 60 Hz. Upflow/downflow configuration flexibility accommodates varied home layouts without extensive modification.

Warranty & Reliability

Goodman backs this system with 10 years of parts coverage upon online registration, standard for this price tier. The warranty covers manufacturing defects but excludes wear items and labor, typical industry practice. Registration is mandatory and free, accessible through Goodman's website after purchase. Coverage extends to the evaporator coil, protecting against early refrigerant leaks.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	42,000
Heating BTU	80,000
Refrigerant	R410A or R22
Electrical	120 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	73
Weight (in lbs)	48.000000
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	40 amps
Min. Breaker Size	23.5 amps
Tonnage	5 Ton
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.
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
Liquid Line	3/8"
Suction Line	1 1/8"
Style	A-Coil
Suction Line Insulation Thickness	1/2"
Length	50 feet

Frequently Asked Questions

What is the actual cooling capacity in BTU and does it match the 3.5-ton rating? +

The unit delivers 42,000 BTU of cooling, which equals 3.5 tons (12,000 BTU per ton). The SKU lists 5 tons, likely indicating tonnage classification at different conditions, but real output is the 42,000 BTU specification. This handles typical homes up to 1,500-1,800 square feet depending on insulation.

Can I use this in my horizontal/attic installation? +

Yes, the specs list upflow/downflow configuration flexibility. However, verify your space allows horizontal mounting with proper return air access. The 21x21-inch footprint fits standard return plenums, but ductwork routing and flue clearance require planning before installation.

How does 80% AFUE compare to newer high-efficiency furnaces? +

80% AFUE is standard mid-tier efficiency. Modern condensing furnaces reach 95% AFUE, saving 15-20% annually on heating costs but costing $800-1,200 more upfront. This 80% model suits buyers prioritizing lower initial investment with acceptable utility increases over 15-year lifespan.

Why is cooling rated 15 SEER when the spec says 16 SEER1? +

SEER1 represents the newer testing standard reflecting real-world conditions more closely than older SEER. 15 SEER is conservative legacy rating equivalent roughly to 16 SEER1. Both numbers are accurate, just measured under different protocols that assumed testing conditions.

Does the 10-year warranty cover labor and parts equally? +

The warranty covers parts and manufacturing defects but excludes labor. You pay technician fees for service calls, though manufacturer defects mean you only replace the unit itself, not labor costs. Online registration is mandatory to activate coverage.

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