2.5 Ton 15 SEER 96% AFUE 40,000 BTU Goodman Gas Furnace and Air Conditioner System - Downflow Review 2026

// Bottom Line

This system works best for budget-conscious homeowners replacing an aging unit in moderate climates where they need reliable heating and cooling without premium pricing. The 96% AFUE furnace and variable-speed blower deliver solid efficiency gains that typically pay for themselves within 3-5 years through utility savings.

Review

The 2.5 ton Goodman downflow system from Online Supply sits squarely in the budget segment at $643, targeting homeowners and contractors who need functional climate control without premium pricing. This packaged unit combines a gas furnace with an air conditioner in a single configuration, eliminating the need for separate component selection. Energy Star certification signals baseline efficiency compliance, while the downflow configuration suits homes where ductwork runs below the unit or in attic spaces.

Performance specs reveal a capable mid-range system: the furnace delivers 40,000 BTU heating with 96% AFUE efficiency using dual-stage burners, meaning it runs lower flame during mild weather to conserve fuel. Cooling capacity reaches 29,000 BTU with a SEER1 rating of 16 and single-stage scroll compressor technology. The variable-speed ECM blower motor operates at 1200 CFM maximum with adaptive speed control that reduces energy waste during partial load conditions, a feature typically reserved for higher-priced equipment.

Pros & Cons

Pros

Exceptional value at $643 for a complete 2.5 ton packaged system with Energy Star certification
High furnace efficiency at 96% AFUE with dual-stage burners reduces heating costs year-round
Variable-speed ECM blower motor adapts to actual demand, improving comfort and lowering runtime energy consumption
Scroll compressor design is proven reliable with minimal maintenance across thousands of installations
10-year warranty with online registration provides solid protection for parts and labor at this price point

Cons

Single-stage cooling compressor means it runs at full capacity even during mild weather, reducing efficiency versus modulating units
SEER1 of 16 is good but not premium, SEER2 would be more relevant for 2024 standards and efficiency comparisons
71.5 dB noise level is noticeable, acceptable for standard residential but louder than high-end variable-speed systems
Specification discrepancy exists between title (2.5 ton) and actual tonnage (3 ton) creating confusion
Requires proper ductwork sizing for 1200 CFM maximum output, undersized ducts will reduce efficiency gains

Who Should Buy

Best For

Homeowners in areas with moderate heating and cooling demands looking to replace a 10-15 year old system without spending $3000-5000. Contractors installing budget systems for rental properties or customers who prioritize upfront savings over premium features.

Consider Alternatives If

Anyone in extreme climates needing variable-capacity cooling, customers seeking whisper-quiet operation under 65 dB, or those with existing ductwork too small for 1200 CFM airflow.

2.5 Ton 15 SEER 96% AFUE 40,000 BTU Goodman Gas Fu

$643

Buy at HVACDirect →

Installation

Installation requires 115V single-phase 60Hz power with 17.1 to 25 amp breaker sizing, standard for residential circuits. The unit accepts both R410A and R22 refrigerants, though new installations should specify R410A. Downflow configuration works with plastic or PVC exhaust flues, common in modern homes. Proper ductwork must support the 1200 CFM airflow, so undersized existing ducts will need replacement to achieve rated performance.

Warranty & Reliability

The 10-year parts and labor warranty activates through online registration with Online Supply, covering manufacturing defects on the condenser, furnace, and blower components. This is competitive for budget-tier equipment but requires following registration steps within a defined window. Actual coverage terms should be verified in documentation, as Some exclusions may apply for improper installation or maintenance neglect.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	29,000
Heating BTU	40,000
Refrigerant	R410A or R22
Electrical	115 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	71.5
Weight (in lbs)	30.000000
Feature	Spec
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	25 amps
Min. Breaker Size	17.1 amps
Tonnage	3 Ton
Height	30"
Width	17.5"
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	7368837
Airflow Direction	Downflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Product Features	Rebate Available
Furnace Efficiency / AFUE	96%
Blower Motor	Variable Speed - ECM
Maximum CFM	1200
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 product title say 2.5 ton but specs list 3 ton tonnage? +

This appears to be a listing error from Online Supply. The actual tonnage is 3 ton based on 29,000 BTU cooling capacity. Verify before purchasing if exact tonnage matters for your home's load calculation. Request clarification from the seller to confirm which rating applies to your installation.

Can I install this system if my current ductwork is smaller than 1200 CFM capacity? +

Technically yes, but you'll lose efficiency and comfort. The 1200 CFM maximum output requires properly sized ducts to avoid excess static pressure, which forces the blower to work harder and consumes more electricity. Undersized ducts typically cost $1500-3000 to upgrade but recover costs through improved efficiency.

How does 96% AFUE compare to newer furnaces, and will it reduce my heating bills? +

96% AFUE is excellent, capturing 96 cents of every dollar spent on fuel as heat versus older 80% units that waste 20%. If replacing a 10-year-old 80% furnace, expect 15-20% heating cost reduction annually, translating to $200-400 savings depending on climate and fuel prices.

Is this system better than splitting the purchase into separate condenser and furnace units? +

Packaged systems simplify installation and reduce labor costs, but separate units often allow better efficiency matching and future upgrades. At this price point, the packaged option makes sense. Upgrade flexibility matters more if you plan to keep the system 15-20 years versus 10.

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

Standard coverage includes manufacturing defects in sealed components and electrical parts. Refrigerant leaks from copper line corrosion or punctures often exclude coverage. Review the AHRI certificate number 7368837 and full warranty document before purchase to confirm specific exclusions.

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