2.5 Ton 15 SEER 80% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Horizontal Review 2026

// Bottom Line

This horizontal combo system works best for budget-conscious homeowners replacing older equipment in homes with space constraints. The 80% AFUE furnace and 15 SEER cooling provide adequate comfort at an attractive price point, though neither component pushes into premium efficiency tiers.

Review

The Goodman 2.5 Ton horizontal combo system hits a practical middle ground in the budget HVAC market. At $2,168, this pairing delivers heating and cooling capability without aggressive pricing that signals corner-cutting. Online Supply's configuration pairs an 80,000 BTU furnace with a 29,000 BTU cooling capacity, designed primarily for straightforward replacement scenarios in existing homes where ductwork and electrical service remain constant.

Performance specs reveal competent but not exceptional efficiency. The furnace delivers 80% AFUE, meaning 20% of fuel energy exits through the flue, typical for standard-efficiency gas furnaces. Cooling pulls 15 SEER on paper though the condenser rates SEER 16, suggesting real-world cooling performance may slightly exceed claims. Two-stage burners and variable-speed blower motors add flexibility that single-stage equipment lacks. The scroll compressor uses R410A refrigerant and operates at 71.5 dB, audible but manageable in most homes.

Pros & Cons

Pros

Variable speed blower motor maximizes comfort and reduces energy waste during partial load operation
Two-stage burner delivers better temperature control and efficiency than single-stage competitors
SEER 16 rating on cooling side exceeds the stated 15 SEER, providing modest efficiency upside
Horizontal configuration perfect for tight attic installations or basement spaces where vertical units won't fit
120V single phase electrical requirement simplifies installation without expensive panel upgrades
10-year parts warranty with online registration provides solid peace of mind for the price

Cons

80% AFUE furnace lags behind 95%+ models, wasting roughly 20% of fuel as exhaust heat
71.5 dB noise level rates moderate to loud, noticeable during furnace operation in quiet homes
Single-stage cooling compressor cycles on and off rather than modulating, less efficient than two-stage designs

Who Should Buy

Best For

Homeowners replacing 10-15 year old equipment who prioritize upfront cost savings over long-term energy bills. Contractors installing systems in space-limited horizontal applications where budget flexibility exists and customer usage patterns don't demand premium efficiency.

Consider Alternatives If

Buyers in cold climates expecting maximum heating efficiency, or anyone prioritizing quiet operation and minimal utility costs should explore 95% AFUE furnaces paired with variable capacity compressors.

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

$2168

Buy at HVACDirect →

Installation

Horizontal orientation simplifies attic and crawlspace installations where vertical clearance limits options. The 21 by 21.125 inch footprint demands 26 inches of depth, fitting standard rafter bays. Requires 120V single phase power with 17.1 to 25-amp breaker capacity, avoiding expensive electrical work. Metal exhaust flue connection is mandatory. Suction line insulation (3/4 inch thickness, 50 feet maximum) and proper refrigerant line sizing (3/8 inch liquid, 7/8 inch suction) follow standard practices.

Warranty & Reliability

A 10-year parts warranty activates with online registration, covering compressor, coil, and most internal components. This matches industry baseline for budget-tier equipment. Labor and refrigerant are typically excluded. The warranty registration requirement adds a small administrative step but confirms coverage without major restrictions. Goodman's reputation for parts availability through Online Supply and other distributors makes claim processing straightforward for homeowners.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	29,000
Heating BTU	80,000
Refrigerant	R410A or R22
Electrical	120 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	3.5 Ton
Height	21"
Width	21.125"
Depth	26"
Resources	CHPF Installation Manual CHPF 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	204633302
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Metal
Furnace Efficiency / AFUE	80%
Blower Motor	Variable Speed
Maximum CFM	2000
Configuration	Horizontal
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

What's the real difference between this 15 SEER and premium 18-20 SEER systems? +

Premium systems use variable-capacity compressors that modulate output continuously, reducing cycling losses. This 15 SEER unit runs single-stage compressor that cycles on and off. Over a cooling season in moderate climates, the efficiency gap translates to roughly 15-20% higher electricity use. In very hot climates, the difference compounds significantly.

Can I install this horizontal unit vertically if I have space? +

The airflow direction spec lists Upflow/Horizontal, meaning it's engineered for those two orientations. Vertical downflow installation risks oil return problems in the compressor and voided warranty. Stick to horizontal or upflow configurations only. Verify with Goodman technical support before any non-standard mounting.

Is 80% AFUE worth the cost difference versus 95% models? +

In moderate climates, upgrading to 95% AFUE recovers costs in 8-12 years through reduced fuel consumption. In very cold regions, payback shrinks to 5-7 years. For short-term occupancy, 80% makes sense. Long-term homeowners benefit from premium models despite higher upfront cost.

How does this Goodman stack against competitors like Lennox or Carrier? +

Goodman focuses on value through reliable basics rather than cutting-edge efficiency. Carrier and Lennox typically offer higher SEER ratings and better noise control at higher prices. Goodman's two-stage burner and variable blower match mainstream competitors. Service availability and parts cost favor Goodman in many markets.

What happens if I don't register the warranty online? +

The 10-year coverage technically requires registration to activate. Without registration, warranty claims may face delays or denials. Online registration takes 5 minutes after installation. Save your AHRI certificate number (204633302) and serial number for proof of purchase when filing claims.

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