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Gas Furnaces

Today's new high efficiency furnaces can save up to 50% in operating costs over a ten-year-old furnace. Many 1990 and earlier model furnaces have Annual Fuel Utilization Efficiency (AFUE) ratings of 65% or less. The minimum AFUE rated furnace that can be sold in the United States today is 80% for the Southeast and Southwest, with 90% being the minimum in the North.

Our current product offering starts at 80% AFUE and goes all the way to a very efficient 98%+ AFUE rating. Depending on your average usage, higher AFUE rated furnaces can significantly reduce your gas bill.

The DOE’s regional breakdown by state is as follows:

  • North – 80% AFUE
  • Southeast – 90% AFUE
  • Southwest - 90% AFUE
DOE Regional SEER Breakdown Map

Let Service First Air Conditioning And Heating Help Pick The Right Furnace For Your Home

We offer many furnaces with variable and multi-speed features that can provide enhanced indoor comfort by slowly ramping up to your thermostat setting rather than simply turning on at full speed. This alleviates the "cold air blow" often associated with single speed furnaces, and dramatically reduces system noise. Call us now at (210) 667-9328.

Gas Furnace Product Offering

GMVM97

Modulating, Variable-Speed ECM Gas Furnace

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Model Family: GMVM97
Annual Fuel Utilization Efficiency: Up to 98% AFUE
Energy Star Rated: ENERGY STAR®
Blower Motor: Quiet variable-speed induced draft blower
Gas Valve: Self-calibrating modulating gas valve
Inducer Draft Motor: Quiet variable-speed induced draft blower
Fan Heating Operation: Variable-Speed
Factory Warranty Parts: 10-Year Parts Limited Warranty
Heat Exchanger Warranty: Lifetime Heat Exchanger Limited Warranty
Sound Level: Quiet operation
Manufacturer's Stated Benefits:
  • 10-Year Unit Replacement Limited Warranty
  • Heavy-duty aluminized-steel tubular heat exchanger
  • Stainless-steel secondary heat exchanger
  • ComfortNet Communicating System compatible
  • Uses ComfortNet™ communicating, two-stage or single-stage thermostats
GCVM97

Modulating, Variable-Speed ECM Gas Furnace

View Brochure
Model Family: GCVM97
Annual Fuel Utilization Efficiency: Up to 97% AFUE
Energy Star Rated: ENERGY STAR®
Blower Motor: Quiet variable-speed
Gas Valve: Self-calibrating modulating
Inducer Draft Motor: variable-speed induced draft blower
Fan Heating Operation: variable speed draft induced
Factory Warranty Parts: 10-Year Limited Parts Warranty
Heat Exchanger Warranty: Lifetime Limited Warranty
Sound Level: Quiet operation
Manufacturer's Stated Benefits:
  • Heavy-duty aluminized-steel tubular heat exchanger
  • Stainless-steel secondary heat exchanger
  • ComfortNet™ Communications System compatible
  • Uses ComfortNet™ communicating, two-stage or single-stage thermostats
GMVC96

Two-Stage, Variable-Speed ECM Gas Furnace

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Model Family: GMVC96
Annual Fuel Utilization Efficiency: Up to 96% AFUE
Energy Star Rated: ENERGY STAR®
Blower Motor: Variable Speed
Gas Valve: Two-stage
Inducer Draft Motor: Quiet two-speed induced draft blower
Fan Heating Operation: Two-speed induced draft
Factory Warranty Parts: 10-Year Limited Parts Warranty
Heat Exchanger Warranty: Lifetime Limited Warranty
Sound Level: Quiet operation
Manufacturer's Stated Benefits:
  • Aluminized-steel tubular heat exchanger
  • Efficient, quiet variable-speed circulator moto
  • ComfortNet™ Communications System compatible
  • Durable 110-volt silicon nitride igniter
  • Self-diagnostic control board
GMVC80

Two-Stage, Variable-Speed ECM Gas Furnace 80% AFUE

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Model Family: GMVC80
Annual Fuel Utilization Efficiency: 80 AFUE
Energy Star Rated: No
Blower Motor: Variable Speed ECM motor
Gas Valve: Two-stage
Inducer Draft Motor: Two Speed
Fan Heating Operation: Two speed induced draft
Factory Warranty Parts: 10 year limited warranty
Heat Exchanger Warranty: Limited Lifetime Warranty
Sound Level: Quiet operation
Manufacturer's Stated Benefits:
  • Durable Silicon Nitride Igniter – Eliminates the need for an energy-wasting pilot light
  • Self-Diagnostic Control Board – Continuously monitors the system for consistent, reliable operation.
  • Thermally -Insulated Cabinet
  • Commissioning and diagnostics via on board Bluetooth with the CoolCloud™ phone and tablet application