5 Ton 15 SEER 96% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Downflow Review 2026

// Bottom Line

This Goodman system works best for homeowners replacing older equipment or building new construction in moderate to cold climates where heating efficiency matters. The 96% AFUE furnace paired with 16 SEER cooling makes it an intelligent choice for those balancing upfront costs with monthly utility bills.

Review

This 5-ton Goodman split system sits in the practical middle of the residential HVAC market. Offered by Online Supply with a 10-year warranty and Energy Star certification, it targets homeowners and contractors balancing performance with cost. The downflow/horizontal configuration suits basements, crawlspaces, and mechanical closets. At 100,000 BTU heating and 54,000 BTU cooling capacity, it handles mid-sized homes efficiently without oversizing complexity.

The furnace delivers 96% AFUE efficiency, placing it in the high-efficiency category and qualifying for rebates in many states. The 16 SEER air conditioner offers solid cooling performance with a scroll compressor and R410A/R22 refrigerant compatibility. Variable-speed ECM blower runs at 2000 CFM maximum, adapting to actual demand. Two-stage heating and single-stage cooling create a hybrid approach: excellent heating modulation paired with straightforward, reliable cooling.

Pros & Cons

Pros

96% AFUE furnace efficiency reduces heating costs by 10-15% compared to 80% AFUE models, translating to $150-250 annual savings in heating-dominant regions
Variable-speed ECM blower motor improves comfort by ramping airflow gradually, reducing cold drafts and noise compared to single-stage blowers
16 SEER cooling efficiency and Energy Star certification signal above-average AC performance for a mid-tier 5-ton unit
Two-stage heating burner modulates flame intensity, matching heating demand and improving comfort during mild weather
Plastic PVC exhaust flue requirement simplifies venting and reduces installation costs versus metal ductwork

Cons

16 SEER rating is solid but trails 18+ SEER competitors, meaning slightly higher cooling costs over time in hot climates
73 dBA noise level is moderate, higher than premium variable-capacity units, which may concern noise-sensitive homeowners
Single-stage condenser lacks the efficiency gains of two-stage or modulating outdoor units during partial-load cooling

Who Should Buy

Best For

Homeowners in northern and mixed climates seeking a balanced heating and cooling upgrade with dependable mid-tier efficiency. Contractors installing systems where budget constraints exist but quality and warranty support matter.

Consider Alternatives If

Buyers in hot climates prioritizing maximum AC efficiency, or those unwilling to pay for annual maintenance on a variable-speed system.

5 Ton 15 SEER 96% AFUE 100,000 BTU Goodman Gas Fur

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Installation

This unit requires 208/230V single-phase 60Hz power with 29.6 to 50-amp breaker sizing. PVC exhaust venting simplifies installation compared to metal chimneys. A-coil design connects standard refrigerant lines: 3/8-inch liquid, 1 1/8-inch suction with 1/2-inch insulation. Downflow orientation demands clearance below the unit for return ducting. Professional HVAC installation remains essential for proper refrigerant charging and airflow balancing.

Warranty & Reliability

Goodman provides 10 years of parts coverage with online registration, a standard tier in the industry. Covers compressor, heat exchanger, and blower components. Does not include labor, refrigerant, or dispatch fees. Registration is straightforward but required within 30 days of installation to activate coverage.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	54,000
Heating BTU	100,000
Refrigerant	R410A or R22
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	7368844
Airflow Direction	Downflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Product Features	Rebate Available
Furnace Efficiency / AFUE	96%
Blower Motor	Variable Speed - ECM
Maximum CFM	2000
Configuration	Upflow / Downflow
Energy Star	Yes
Burner Stages	Two
Fuel Type	Propane, Natural Gas
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.
SEER1 (Efficiency)	16
Condenser Stages	Single Stage
Compressor Type	Scroll
Liquid Valve Size	3/8"
Suction Valve Size	7/8"
Max Breaker Size	50 amps
Min. Breaker Size	29.6 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

How much will this furnace reduce my heating bill compared to a standard 80% AFUE unit? +

The 96% AFUE rating captures 16 percentage points more heat energy than 80% AFUE furnaces. In cold climates using 5,000+ heating degree days annually, expect $150-250 annual savings. Actual results depend on gas rates, thermostat settings, and home insulation. New construction or well-sealed homes see better returns.

Can I install this system in an attic or horizontal position? +

Yes. The downflow/horizontal configuration accommodates attic, basement, or horizontal crawlspace mounting. Ensure adequate ventilation around the furnace and support the unit securely. PVC venting must slope properly to avoid condensate backup. Consult the CAPF installation manual for orientation-specific piping and clearance requirements.

Is 16 SEER good enough for summer cooling in hot regions? +

16 SEER is respectable but not premium for hot climates. It performs well in mixed or moderate climates but may lag competitors offering 18+ SEER. High-load cooling seasons will generate higher utility costs. Consider upgrading to a two-stage condenser if budget allows and AC runtime exceeds 2,000 hours yearly.

How does this system compare to a higher-end Goodman or competitor units? +

This mid-tier Goodman balances cost and efficiency effectively. Higher-end units offer two-stage condensers, variable-speed outdoor fans, and 17+ SEER ratings but cost 15-25% more. Budget brands drop below 15 SEER. For contractors, this model delivers good margins and solid customer satisfaction without premium pricing.

What happens to my warranty if I don't register the system? +

Registration within 30 days of installation activates the 10-year parts warranty. Without registration, coverage defaults to the manufacturer's limited warranty, typically 1-5 years. Online registration takes minutes and protects your investment, so do not skip this step.

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