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 is ideal for budget-conscious homeowners upgrading older furnaces or contractors looking for a straightforward combo unit under $2,100. The 80% AFUE heating and 15 SEER cooling deliver respectable efficiency gains without premium pricing, though it won't match high-efficiency models.

Review

The Goodman 3.5-ton split system represents the practical middle ground in residential HVAC. At $2,053, it positions itself as the smart choice for homeowners tired of aging equipment but not ready to invest in premium efficiency tiers. This upflow configuration fits standard furnace closets and basements. The system carries Energy Star certification, which matters when you're justifying the purchase to a skeptical partner.

Performance-wise, the 80% AFUE furnace delivers 80,000 BTU of heating, while the air conditioning side produces 42,000 BTU at 15 SEER efficiency. The variable-speed blower motor (2,000 CFM maximum) runs on 208/230V single-phase power and adapts to real demand, which contractors appreciate for eliminating short-cycling complaints. Two-stage heating and single-stage cooling keep the operating profile simple, reducing troubleshooting complexity over time.

Pros & Cons

Pros

Variable-speed blower motor maximizes comfort and reduces energy waste during partial-load operation
Two-stage burner adapts heating output to actual demand, improving consistency in mild weather
80% AFUE meets federal minimums and qualifies as Energy Star, lowering heating costs
15 SEER cooling efficiency strikes balance between performance and affordability
10-year warranty with online registration provides solid peace-of-mind coverage
Single-stage condenser and scroll compressor design proven reliable across thousands of installations

Cons

80% AFUE is baseline modern efficiency, not high-efficiency, so it won't satisfy builders seeking 95% units
73 dBA noise level is moderate, slightly louder than premium variable-capacity models
Spec sheet lists both 3.5-ton and 5-ton tonnage which suggests potential documentation confusion that needs clarification

Who Should Buy

Best For

Homeowners in moderate climates replacing 15+ year old systems will see immediate utility savings with this unit. Contractors handling budget renovations and new construction without premium spec requirements will appreciate the straightforward installation and competitive pricing.

Consider Alternatives If

Anyone in cold climates needing maximized winter efficiency or seeking cutting-edge quietness should explore 95% AFUE and variable-capacity alternatives from Carrier or Lennox.

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

$2053

Buy at HVACDirect →

Installation

Installation requires standard 208/230V single-phase power with 23.5 to 40-amp breaker sizing. The unit weighs 48 pounds and measures 30 inches tall by 21 wide by 21 deep, fitting most upflow installations. Technicians must use metal exhaust flue (not plastic) and properly size refrigerant lines, 3/8 inch liquid with 7/8 inch suction line, both requiring 1/2 inch suction insulation over 50 feet.

Warranty & Reliability

Goodman's 10-year parts and labor warranty activates upon online registration, covering major components like the compressor and heat exchanger. This protects against manufacturing defects during the critical first decade. Note that evaporator coil coverage is included, though some regional dealers may have additional limitations, so always read fine print before signing.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	42,000
Heating BTU	80,000
Refrigerant	R410A
Electrical	208 / 230 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	73
Weight (in lbs)	48.000000
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	CAPT Installation Manual CAPT 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	40 amps
Min. Breaker Size	23.5 amps
Tonnage	5 Ton
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 show both 3.5-ton and 5-ton tonnage? +

The tonnage discrepancy appears to be documentation error from Online Supply. The 42,000 BTU cooling capacity confirms 3.5-ton rating. Contact the seller before purchase to clarify which condenser you're receiving, as this affects performance expectations and system balance.

Can I install this system in my upflow attic space? +

Yes, the upflow configuration and 30-inch height fit standard attic installations. However, you must provide adequate return airflow, proper metal exhaust venting, and electrical service. Have an HVAC contractor verify your space before ordering to avoid compatibility issues with ductwork.

How much will this system save on heating compared to my 20-year-old furnace? +

An 80% AFUE system versus 60-65% older equipment typically saves 15-20% on heating costs annually, depending on climate and usage. In a cold climate, that translates to $300-500 yearly savings. Payback ranges from 5-8 years before accounting for AC efficiency gains.

Is 15 SEER cooling competitive with other brands at this price point? +

Yes, Goodman, Rheem, and Ruud all offer 15 SEER units near $2,000. This system matches their cooling tier but trails premium 16-18 SEER models. For most moderate climates, 15 SEER provides solid efficiency without the 25-30% price premium of higher ratings.

Does the 10-year warranty cover refrigerant leaks and electrical failures? +

The warranty covers manufacturing defects in the compressor, coils, and sealed components. Refrigerant leaks from manufacturing defects are covered, but leaks from installation errors or neglect are not. Electrical component failures are included with proper registration.

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