2.5 Ton 14 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Horizontal Review 2026

// Bottom Line

This Goodman system works best for homeowners in moderate climates who want dependable heating and cooling without premium pricing. The 80% AFUE furnace and 14 SEER condenser deliver respectable efficiency gains over older equipment, making it a practical upgrade for existing homes.

Review

The Goodman 2.5 ton horizontal system addresses a real market need, occupying the middle ground between entry-level and premium HVAC equipment. Marketed through Online Supply at an attractive price point, this combination furnace and air conditioner appeals to homeowners replacing aging systems and contractors managing multiple installations. Goodman's reputation for straightforward engineering and reasonable durability makes this a familiar choice on job sites across the country.

Performance data reveals measured compromises and strengths. The furnace delivers 100,000 BTU with 80% AFUE efficiency, meaning 80 cents of every heating dollar reaches your home as useful heat. Cooling reaches 29,000 BTU with 14 SEER rating, translating to reasonable seasonal performance in temperate zones. The two-stage burner and high-efficiency variable-speed motor help offset the mid-tier efficiency ratings by reducing runtime waste. Maximum airflow reaches 2000 CFM, adequate for 2.5 ton systems in most residential applications.

Pros & Cons

Pros

Two-stage burner provides better temperature control and lower operating costs than single-stage systems
High-efficiency multi-speed blower motor with 2000 CFM maximum allows quieter operation at part load
Energy Star certified system qualifies for some rebates and tax incentives in eligible regions
10-year warranty with online registration covers parts comprehensively
Compact horizontal design at 21 by 26 inches fits tight attic or basement installations
Dual refrigerant compatibility, R410A or R22, offers technician flexibility

Cons

80% AFUE is mid-range efficiency, not suitable for homes targeting high-efficiency retrofits or extreme climates
71.5 dB noise level runs slightly louder than premium models, noticeable during heating cycles
Single-stage condenser means cooling runs at full capacity regardless of outdoor temperature, reducing efficiency in mild weather
Metal exhaust flue requirement limits installation options in some older homes

Who Should Buy

Best For

Homeowners in mixed climates replacing 15-25 year old systems who prioritize upfront affordability over premium efficiency. Contractors building budget-friendly rental or investment properties benefit from Goodman's straightforward design and parts availability.

Consider Alternatives If

High-efficiency seekers in cold climates should pursue 95% AFUE furnaces paired with 16+ SEER units, and homes in hot regions benefit more from dual-stage cooling systems.

2.5 Ton 14 SEER 80% AFUE 100,000 BTU Goodman Gas F

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Installation

Horizontal configuration simplifies installation in tight attics and cramped basements where vertical clearance is limited. The 30-pound weight makes solo handling difficult, requiring two technicians for safe positioning. Metal exhaust flue requirement means existing single-wall venting cannot be reused, adding installation cost. Electrical demands stay moderate at 17-25 amp breaker sizing, compatible with most residential panels.

Warranty & Reliability

Ten-year parts coverage with online registration provides solid peace of mind beyond typical five-year industry minimums. Coverage includes the furnace heat exchanger and compressor, the most expensive failure points. Registration is straightforward but mandatory to activate full protection, so document your purchase carefully. Labor costs and refrigerant remain buyer responsibility.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	29,000
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)	71.5
Weight (in lbs)	30.000000
Feature	Spec
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Metal
Furnace Efficiency / AFUE	80%
Blower Motor	High Efficiency Multi-Speed
Maximum CFM	2000
Configuration	Horizontal
Burner Stages	Two
Fuel Type	Gas
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.
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
Liquid Line	3/8"
Suction Line	7/8"
Style	A-Coil
Suction Line Insulation Thickness	3/4"
Length	50 feet

Frequently Asked Questions

What does 80% AFUE mean for my heating bills? +

Eighty percent AFUE means 20% of fuel energy escapes through the exhaust flue as wasted heat. A system replacing equipment from the 1990s, typically 65-70% AFUE, will cut heating costs roughly 12-18% depending on your climate, thermostat habits, and insulation quality.

Does this horizontal unit fit standard attic spaces? +

At 21 by 26 inches wide and deep, and 21 inches tall, it fits most attics with 24-30 inch rafter spacing. Verify clearance above and below the unit for airflow, and confirm your metal exhaust flue can route safely through the roof without obstruction.

How does 14 SEER cooling performance compare to newer systems? +

Fourteen SEER provides solid baseline cooling efficiency, reasonable for replacing 10-13 SEER units from the 2000s. Modern standards push 16+ SEER with variable-stage compressors for better part-load efficiency. This single-stage design cools efficiently in steady conditions but wastes energy cycling at full capacity in mild weather.

Should I pair this with a different brand air handler or condenser? +

While possible, mixing brands voids most warranties and complicates troubleshooting. Goodman components integrate tested, documented compatibility. System matching during initial design prevents refrigerant charge errors and airflow problems that plague mixed-equipment installations.

What does the 10-year warranty actually cover if my system fails? +

Parts coverage includes the compressor, heat exchanger, motors, and controls for ten years with proof of registration. Labor and refrigerant are excluded. Read your specific warranty document carefully to understand any prorated terms after year five.

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