80% AFUE GC9C80

  • Up to 80% AFUE performance
  • Multi-position installation
  • Super-efficient ECM motor
GDS8 Gas Furnace
10 Yr Unit Replacement Limited Warranty* Lifetime Heat Exchanger Limited Warranty* 10 Yr Parts Limited Warranty*

* Complete warranty details available from your local dealer or at franklinhvacsystems.com. To receive the 10-Year Unit Replacement Limited Warranty, Lifetime Heat Exchanger Limited Warranty (good for as long as you own your home) and 10-Year Parts Limited Warranty, online registration must be completed within 60 days of installation. Online registration is not required in California or Quebec. The duration of warranty coverage in Texas and Florida differs in some cases.


** Can no longer be installed in California’s South Coast Air Quality Management District (SCAQMD) on or after October 1, 2019.

Product Features+

  • Two-stage gas valve provides quiet, economical heating
  • Efficient and quiet multi-speed ECM circulator motor
  • SureStart® silicon nitride igniter designed for long igniter life
  • Self-diagnostic control board
  • Low constant fan speed circulates air throughout the home
  • Quiet, two-speed induced draft blower
  • California Low NOx emissions-compliant models available

Outstanding Limited Warranty Protection+

This furnace is covered by what we believe to be one of the best warranties in the indoor home comfort industry. In addition to covering the heat exchanger with a Lifetime Limited Warranty to the original, registered homeowner, if the heat exchanger fails during the first 10 years of ownership, we will replace the entire unit for as long as you own your home. This furnace also has a 10-Year Limited Parts Warranty on all functional parts. For a full description of all warranties applicable to this product, please review the consumer brochure or product warranty by clicking on the tabs below.


This gas furnace has an AFUE rating of 80%, which means that 80 cents of every $1.00 of heating energy expense warms your home.

Energy Consumption

Before purchasing this appliance, read important information about its estimated annual energy consumption, yearly operating cost, or energy efficiency rating that is available from your retailer.