3.5 Ton 13 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Downflow




GSX130421 / CAPF3743C6 / GDS81005CN




Authorized Goodman Dealer

AHRI Certified

AHRI Number:200537900

Your Low Price $2,287.00
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Requires: Metal Flue Vent Piping


Goodman has been manufacturing high quality heating and air conditioning equipment since 1982. Harold Goodman, the founder of Goodman heating and air conditioning, recognized an absence of high quality, low cost air conditioning equipment in the American market. After learning that another HVAC company was going out of business, Goodman purchased its equipment and transported it to Houston. There, the Goodman HVAC group continues to this day to manufacture some of the highest quality air conditioners in the industry at the lowest possible prices. Goodman's Gas Furnaces represent the most efficient designs on the market today, with high efficiency heat exchangers and low emissions. Goodman strives to perfect its furnaces by researching a wide variety of potential efficiency improvements, the best of which make their way into every single one of their heaters.

Please note that this product is regulated by DOE Efficiency Standards.

  • Dual-diameter tubular heat exchanger
  • Single-stage combination redundant gas valve
  • Norton hot surface mini-igniter
  • Quiet multi-speed direct-drive circulator blower motor
  • Furnace control board with self-diagnostics and low voltage terminal block
  • Quiet single-speed, induced-draft blower
  • All “X” models comply with California NOx emissions standards

The Goodman GSX130421 Air Conditioner Condenser uses the chlorine-free refrigerant R-410A and features operating sound levels that are among the lowest in the heating and cooling industry. With its 13 SEER rating, The Goodman GSX130421 Air Conditioner Condenser will help reduce energy consumption throughout the life of the system. Goodman has become one of the largest manufacturers of residential and light commercial air conditioning, heating, and indoor air quality products and systems by focusing on just one thing, building the most reliable and refreshingly affordable indoor comfort products in the market. 

Please note that this product is regulated by DOE Efficiency Standards.

  • R-410A chlorine-free refrigerant
  • Factory-installed filter dryer
  • Copper tube/enhanced aluminum fin coil
  • Service valves with sweat connections and easy-access gauge ports
  • Contactor with lug connection
  • Ground lug connection
  • AHRI Certified; ETL Listed
  • Goodman brand louvered sound control top design
  • Steel louver coil guard
  • Heavy-gauge galvanized-steel cabinet
  • Baked-on powder-paint finish with 500-hour salt-spray approval
  • Top and side maintenance access
  • Single-panel access to controls with space provided for field-installed accessories
  • When properly anchored, meets the 2010 Florida Building Code unit integrity requirements for hurricane-type winds

Product Specifications

More Information
3.5 Ton 13 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Downflow
SKUGSX130421 / CAPF3743C6 / GDS81005CN
AHRI Certificate Number200537900
Exhaust Flue RequirementMetal
Furnace Efficiency / AFUE 80%
Heating BTU100000
ConfigurationDedicated Downflow
Condenser StagesSingle Stage
System Tonnage3.5 Ton
Warranty10 Years with Online Registration


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For over three decades Goodman has concentrated on something more important than simple brand recognition consumer advertising. They focus on the design, engineering, and manufacturing of dependable products that have helped millions and millions of homeowners achieve reliable, high-quality, and affordable indoor comfort. In addition, Goodman has earned the loyalty and respect from thousands of local independent heating and cooling professionals across North America.