Goodman 3.5 Ton 14 SEER 80% 120,000 BTU Furnace & AC System - R410A Upflow Review 2026

// Bottom Line

This Goodman system suits homeowners in moderate climates needing reliable heating and cooling without premium pricing. The 80% AFUE furnace and 16 SEER cooling coil deliver respectable efficiency for budget-conscious contractors installing standard residential replacements.

Review

The Goodman 3.5-ton combination system represents the practical middle ground in residential HVAC, targeting contractors and homeowners who want reliable performance without premium pricing. This upflow-configured unit pairs an 80% AFUE gas furnace with an air conditioning coil, making it suitable for replacing older split systems. The R410A refrigerant compliance, ENERGY STAR certification, and scroll compressor technology reflect modern standards rather than cutting-edge innovation.

Performance specifications show interesting contradictions worth noting. The system delivers 120,000 BTU heating output from its two-stage burner and 42,000 BTU cooling capacity, yet the spec sheet lists both 3.5-ton and 5-ton tonnage ratings. The actual 16 SEER cooling efficiency exceeds the advertised 14 SEER, a pleasant surprise. The 80% furnace efficiency is respectable but trails high-efficiency condensing models at 90 percent or higher. Electrical requirements include a 22.4 to 35-amp breaker on standard 120V single-phase service.

Pros & Cons

Pros

16 SEER cooling efficiency exceeds the 14 SEER rating claim, offering better than advertised performance
Two-stage burner provides modulating heat output, reducing energy waste during mild weather
Multi-speed blower motor adapts airflow to actual heating and cooling demand
10-year warranty with online registration provides solid long-term coverage
ENERGY STAR certified, qualifying buyers for potential utility rebates
Single-stage scroll compressor is proven technology with low service costs

Cons

80% AFUE furnace efficiency lags behind 90%+ models, increasing winter operating costs in cold climates
73 dB noise level during operation may be noticeable in quiet rooms, especially during cooling
Single-stage air conditioning compressor cycles on and off rather than modulating, reducing comfort precision
Spec discrepancies noted: listed as both 3.5 ton and 5 ton, creating confusion about actual capacity

Who Should Buy

Best For

Budget-conscious homeowners replacing aging systems in mild to moderate climates, or contractors handling standard residential retrofit jobs where efficiency rebates matter more than premium performance. This system makes sense for customers prioritizing upfront savings over premium modulation.

Consider Alternatives If

Homes in very cold regions needing maximum heating efficiency, or buyers in hot climates wanting variable-speed compressor technology for enhanced comfort and minimal noise.

Goodman 3.5 Ton 14 SEER 80% 120,000 BTU Furnace &

Buy at HVACDirect →

Installation

Installation requires standard upflow or downflow positioning with metal flue venting for the furnace section. Refrigerant line sizing uses 3/8-inch liquid and 1 1/8-inch suction lines with 1/2-inch insulation thickness and 50 feet maximum run length. Connection points are sweat-type fittings, making installation accessible to experienced HVAC technicians but requiring proper brazing equipment and refrigerant certification.

Warranty & Reliability

Coverage includes a solid 10-year parts warranty upon online registration, a common industry standard. This protects against manufacturing defects but excludes wear items and improper installation. The warranty transfers to secondary owners, adding resale value. Compare this to extended plans available separately for higher-cost components.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	42,000
Heating BTU	120,000
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
Product Features	Rebate Available
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	35 amps
Min. Breaker Size	22.4 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.
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Metal
Furnace Efficiency / AFUE	80%
Blower Motor	Multi-Speed
Maximum CFM	2000
Configuration	Upflow / Downflow
Burner Stages	Two
Fuel Type	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

Why does the spec sheet list both 3.5-ton and 5-ton capacity? +

This appears to be a vendor documentation error. The 42,000 BTU cooling output equates to 3.5 tons of capacity, making that the accurate rating. The 5-ton listing may reflect a different configuration. Verify with Online Supply before purchase to confirm the actual tonnage.

Can this system work in very cold climates? +

The 80% AFUE furnace works fine mechanically in cold regions, but efficiency suffers compared to 95% AFUE condensing units. Heating costs will run 10-15 percent higher annually. If you're in Minnesota or Canada, budget for higher utility bills or consider upgrading to high-efficiency.

How does 16 SEER actual vs. 14 SEER advertised affect real-world cooling? +

The higher actual SEER rating means better seasonal efficiency during typical cooling cycles. You'll see roughly 3 percent lower summer electricity costs than a true 14 SEER unit. Energy rebates should be based on the advertised 14 SEER, so the upgraded performance is a bonus.

Is this system better than Rheem or Carrier models at similar price points? +

Goodman competes directly with Rheem's value tier and Carrier's entry-level models. All use similar scroll compressor technology. Goodman's two-stage burner modulation is competitive. Rheem may offer slightly better warranty terms, while Carrier commands brand premium pricing without performance advantage.

What does the 10-year warranty actually cover? +

Parts replacement for manufacturing defects, including compressor and heat exchanger. Labor and refrigerant charges are typically owner's responsibility. Registration is required within a set timeframe. Read the full warranty document before installation to understand exclusions.

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