3.5 Ton 14 SEER 80% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This Goodman combo system works best for contractors and homeowners needing reliable dual-fuel heating and cooling without premium efficiency demands. At $2053, it delivers solid mid-tier performance for modest budgets, particularly in mixed climates where both heating and cooling matter equally.

Review

The Goodman 3.5 Ton Gas Furnace and Air Conditioner System at $2053 occupies the practical middle ground of residential HVAC equipment. It's a traditional split system combining furnace and air handler in one compact cabinet, designed for upflow installations where space is limited. Online Supply markets this SKU LS38783830 as a straightforward replacement option, backed by Goodman's reputation for no-nonsense reliability rather than cutting-edge innovation.

Performance specs reveal a competent mid-tier performer. The furnace delivers 80,000 BTU of heating across two burner stages, achieving 80% AFUE efficiency through conventional gas combustion and blower design. Cooling capacity reaches 42,000 BTU with a 14 SEER rating, powered by a scroll compressor using R410A refrigerant. The variable-speed blower motor modulates up to 2000 CFM, adapting to heating and cooling loads. Decibel output registers at 73 dBA, typical for single-stage condenser operation.

Pros & Cons

Pros

Two-stage burner with 80,000 BTU heating capacity handles cold climates effectively without oversizing
14 SEER cooling efficiency paired with 42,000 BTU output meets most residential comfort needs
Variable-speed blower motor optimizes airflow across the 2000 CFM maximum, reducing energy waste during partial-load operation
Compact 30-inch cube design fits tight attic and basement installations where full-size units won't fit
Dual fuel capability accepts both propane and natural gas, offering installation flexibility
10-year warranty with online registration covers parts and compressor, standard for Goodman equipment

Cons

80% AFUE is entry-level heating efficiency, noticeably below 90%+ units available at similar price points
Single-stage condenser limits cooling modulation, cycling on-off rather than ramping capacity with demand
Not Energy Star certified, missing potential rebates available in many utility programs
73 dBA operating noise is moderately loud for residential settings, noticeable during cooling cycles

Who Should Buy

Best For

Contractors installing replacement systems on tight budgets and homeowners in split heating/cooling climates who prioritize affordability over peak efficiency. This unit suits properties with existing propane infrastructure or those requiring natural gas conversion.

Consider Alternatives If

Buyers seeking Energy Star certification, those in heating-dominant climates wanting 90%+ AFUE efficiency, or homeowners targeting AHRI-listed ultra-high-efficiency combos.

3.5 Ton 14 SEER 80% AFUE 80,000 BTU Goodman Gas Fu

$2053

Buy at HVACDirect →

Installation

Installation requires metal exhaust flue and dual electrical lines: 208/230V single-phase 60 Hz with breaker sizing between 22 and 35 amps. The A-coil configuration demands suction line insulation at 3/8-inch thickness and can extend up to 30 feet in length. Upflow/horizontal flexibility supports both attic and basement placement. Contractors should verify AHRI certificate 204633302 before commencing work to ensure proper system matching.

Warranty & Reliability

Goodman provides 10 years of parts and compressor coverage upon online registration. This matches industry standard for mid-tier equipment but requires owner action post-purchase. Coverage includes the evaporator coil through the dedicated Goodman Evaporator Coil Warranty terms. Homeowners should register immediately to activate coverage.

Specifications

SKU	LS38783830
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)	30.000000
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	No
SEER1 (Efficiency)	14
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 amps
Tonnage	5 Ton
Liquid Line	3/8"
Suction Line	7/8"
Style	A-Coil
Suction Line Insulation Thickness	3/8"
Length	30 feet

Frequently Asked Questions

How does 80% AFUE compare to other options in this price range? +

80% AFUE is entry-level modern efficiency. Units costing $500 to $800 more typically offer 90-95% AFUE with condensing technology. This Goodman suits buyers prioritizing upfront savings over monthly utility reductions. Ten-year payback on efficiency upgrade often justifies premium models for long-term owners.

Can this system run on propane instead of natural gas? +

Yes, this unit accepts both propane and natural gas through convertible burner design. Contractors must swap the burner orifice during installation to match fuel type. Verify all conversion hardware is included with purchase before installation starts.

Is 14 SEER cooling sufficient for a 3.5-ton system? +

14 SEER is solid for mid-tier cooling, meeting SEER minimum standards since 2023. Expect 25-30% lower cooling efficiency than 18-20 SEER premium units. The 42,000 BTU capacity handles moderate climates well. Hot, humid regions may benefit from higher SEER ratings.

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

Variable-speed motors reduce energy consumption by matching airflow to actual heating/cooling demand. Single-speed blowers run at full 2000 CFM constantly, wasting energy during low-demand periods. This Goodman's variable motor typically saves 10-15% annual electricity versus constant-run competitors.

What does the 10-year warranty actually cover? +

Coverage includes parts and compressor defects when registered within 90 days of purchase. Evaporator coil carries separate Goodman warranty terms. Labor is not covered. Normal wear, installation errors, and refrigerant loss are excluded.

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