3 Ton 18 SEER 80% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This Goodman system works well for homeowners upgrading from older equipment who want solid efficiency without premium pricing. The two-stage components and variable-speed blower make it practical for mixed climates where you need both heating and cooling performance.

Review

This Goodman combo system represents the practical middle ground in residential HVAC equipment. At $2160, you're getting factory-assembled cooling and heating components designed to work together, which simplifies ordering and reduces installation variables. The 18 SEER cooling and 80% AFUE heating ratings slot this unit into the efficient-but-not-premium category that appeals to budget-conscious homeowners who still want better performance than basic equipment.

The two-stage compressor delivers 35,000 BTU of cooling capacity at 18 SEER efficiency, while the two-stage furnace burner produces 80,000 BTU of heating output at 80% AFUE. The variable-speed blower motor operates up to 2000 CFM and adjusts automatically to avoid oversized system waste. This modulation approach keeps part-load efficiency strong, meaning moderate days use less power than fixed-capacity competitors. The scroll compressor runs at 71 dB, which is acceptable for residential settings but slightly above quieter inverter-driven units.

Pros & Cons

Pros

18 SEER cooling efficiency qualifies for ENERGY STAR and reduces summer operating costs by 20-30% versus 13 SEER units
Two-stage compressor and two-stage burner allow the system to modulate output, improving comfort and part-load efficiency
Variable-speed blower motor adjusts airflow from 0-2000 CFM, reducing energy waste during low-demand periods
80,000 BTU heating capacity handles most residential heating demands in moderate to cold climates
10-year warranty with online registration provides solid protection at this price point

Cons

80% AFUE is baseline for modern standards, not best-in-class (95%+ modulating furnaces available at higher cost)
5 ton cooler capacity mismatches the 3 ton system designation, creating confusion about actual cooling output
71 dB noise level is acceptable but notably louder than high-efficiency competitors at similar price

Who Should Buy

Best For

Homeowners replacing 15+ year old split systems who prioritize balanced heating and cooling without paying premium prices. This works especially well for those in transitional climates needing reliable dual-fuel performance from a single unit.

Consider Alternatives If

Anyone in hot climates where AC dominates usage should seek higher SEER ratings, and homeowners in cold climates wanting maximum heating efficiency should consider 90%+ AFUE alternatives.

3 Ton 18 SEER 80% AFUE 80,000 BTU Goodman Gas Furn

$2160

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Installation

This upflow/horizontal configuration requires proper ductwork clearance and installation in unconditioned spaces like attics or basements. The suction line needs 3/4-inch insulation wrapped for 50 feet, and you'll need a metal exhaust flue for combustion. Electrical demands span 21.3 to 35 amp breaker capacity at 120V single-phase. Refrigerant connections use standard 3/8-inch and 3/4-inch sweat valves, keeping material costs reasonable for techs.

Warranty & Reliability

The 10-year parts warranty applies when you register the system online after installation. This covers compressor, coil, and most internal components, though labor is not included. At this price point, the warranty duration matches competitor offerings and provides reasonable protection against manufacturing defects during the critical first decade of operation.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	35,000
Heating BTU	80,000
Refrigerant	R410A or R22
Electrical	120 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	71
Weight (in lbs)	30.000000
Feature	Spec
Product Features	Two Stage Condenser
Energy Star	Yes
SEER1 (Efficiency)	18
Condenser Stages	Two Stage
Compressor Type	Scroll
Liquid Valve Size	3/8"
Suction Valve Size	3/4"
Max Breaker Size	35 amps
Min. Breaker Size	21.3 amps
Tonnage	5 Ton
Valve Type	Sweat
Height	30"
Width	24.5"
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	204633307
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	7/8"
Style	A-Coil
Suction Line Insulation Thickness	3/4"
Length	50 feet

Frequently Asked Questions

Why does the spec sheet show 5 ton cooler capacity when this is marketed as 3 ton? +

The condenser unit specifications may reflect component ratings rather than system matching. Always verify with the AHRI Certificate Number (204633307) to confirm the matched 3 ton system performance rating. This discrepancy is common with component-based systems and doesn't affect performance if properly configured.

Can this system use both R410A and R22 refrigerant? +

The specs list both options, but your installer must select one during commissioning. R410A is standard for new systems and requires specific mineral oil. R22 is largely phased out. Confirm with your dealer which refrigerant is pre-charged in your unit to avoid incompatibility issues.

Is 80% AFUE heating efficient enough compared to newer furnaces? +

80% AFUE meets current minimum efficiency standards and is adequate for moderate climates. However, condensing furnaces reach 90-98% AFUE, reducing heating costs 10-18% more. Choose 80% AFUE if budget is primary concern, but expect higher winter utility bills than premium alternatives.

How does 18 SEER cooling compare to what I should expect? +

18 SEER is solid mid-range efficiency, roughly 35% better than 13 SEER baseline units. High-end systems reach 20-22 SEER, costing $500-800 more. For most homeowners in mixed climates, 18 SEER delivers meaningful savings without premium pricing, reducing annual cooling costs measurably.

What does the 10-year warranty actually cover if something fails? +

The warranty covers parts and internal components like compressor, coil, and blower motor when registered within 30 days of installation. It excludes labor, refrigerant, and damage from improper maintenance. You need professional service calls to utilize coverage, so factor service availability into your decision.

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