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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 Koppeis Heating & Cooling 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 (573) 756-1224.

90% Gas Furnace Product Offering

987M

EVOLUTION™ 98 VARIABLE-SPEED MODULATING GAS FURNACE

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Model Family: 987M
Annual Fuel Utilization Efficiency: Up to 98.3% AFUE
Energy Star Rated: ENERGY STAR®
Blower Motor: Variable-speed full-featured ECM
Gas Valve: Modulating
Inducer Draft Motor:
Fan Heating Operation: Four speeds of continuous fan operation with a compatible control
Factory Warranty Parts: 10-year parts limited warranty upon registration
Heat Exchanger Warranty: Lifetime limited warranty; Red ShieldTM 10-year unit replacement warranty (heat exchanger failure only) upon timely registration.
Sound Level: Quiet operation
Manufacturer's Stated Benefits:
  • Variable-speed blower allows unit to operate at lower speeds up to 90% of the time, ensuring consistent airflow and temperature.
  • Perfect Heat™ technology monitors changing conditions to adjust heating
  • Perfect Humidity™technology removes up to 127% more moisture than a standard furnace
  • Fan On Plus™ technology
986T

EVOLUTION™ 96 VARIABLE-SPEED GAS FURNACE

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Model Family: 986T
Annual Fuel Utilization Efficiency: Up to 96.7% AFUE
Energy Star Rated: ENERGY STAR®
Blower Motor: Variable-speed ECM and two speed inducer motor
Gas Valve: Two-stage
Inducer Draft Motor:
Fan Heating Operation: Four speeds of continuous fan operation with a compatible control
Factory Warranty Parts: 10-year parts limited warranty upon registration
Heat Exchanger Warranty: Lifetime limited warranty on heat exchanger
Sound Level: Quiet operation
Manufacturer's Stated Benefits:
  • Silicon Nitride Perfect Light™ Hot Surface Igniter
  • SmartEvap™ technology can lower the humidity level in the home by nearly 10 percent when paired with a compatible condensi
  • FanOnPlus™ technology allows control of continuous fan speed from a compatible thermostat
  • Aluminized-steel primary heat exchanger
  • Stainless-steel condensing secondary heat exchanger
926T

PREFERRED™ 96 TWO STAGE GAS FURNACE WITH INTELISENSE™ TECHNOLOGY

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Model Family: 926T
Annual Fuel Utilization Efficiency: Up to 96.7%AFUE
Energy Star Rated: ENERGY STAR®
Blower Motor: Variable speed, constant torque high-efficiency ECM
Gas Valve: Two-stage
Inducer Draft Motor:
Fan Heating Operation: Continuous fan operation with a compatible control
Factory Warranty Parts: 10-year parts limited warranty upon registration
Heat Exchanger Warranty: Lifetime limited warranty
Sound Level: Quiet operation
Manufacturer's Stated Benefits:
  • Enjoy the ultra-quiet performance and even-temperature comfort of variable speed air delivery. It's also the best choice for imp
  • Perfect Heat™ technology means consistent comfort by adjusting system operation to changing conditions
  • Perfect Humidity™ technology capability with appropriate control and equipment removes more moisture than a standard furna
  • Fan On Plus™ lets you choose the speed of continuous fan operation with a compatible control
  • Insulated cabinet for quieter operation
912S

Legacy™ 92 GAS FURNACE

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Model Family: 912S
Annual Fuel Utilization Efficiency: Up to 92.1% AFUE
Energy Star Rated: N/A
Blower Motor: Fixed-speed constant torque ECM motor
Gas Valve: Single-stage
Inducer Draft Motor:
Fan Heating Operation: Fixed Speed
Factory Warranty Parts: 10-year parts limited warranty when properly registered.
Heat Exchanger Warranty: 20-year limited warranty on heat exchanger when properly registered.
Sound Level: Quiet operation
Manufacturer's Stated Benefits:
  • Fan On Plus™ technology lets you choose the speed of continuous fan operation with a compatible control
  • PerfectLight™ hot surface igniter eliminates gas-wasting pilot light
  • Insulated cabinet for quieter operation
  • Allows gas furnace/heat pump system combinations for best heating efficiences
  • Filter cabinet

80% Gas Furnace Product Offering

315A

Evolution® Series Variable-Speed 80% Gas Furnace

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Model Family: 315A
Annual Fuel Utilization Efficiency: 80% AFUE
Energy Star Rated: N/A
Blower Motor: Variable speed ECM
Gas Valve: Two-stage
Inducer Draft Motor:
Fan Heating Operation: Two-stage operation
Factory Warranty Parts: 10-year parts limited warranty when properly registered.
Heat Exchanger Warranty: Limited lifetime
Sound Level: QuieTech™
Manufacturer's Stated Benefits:
  • Quiet performance and even-temperature comfort from variable-speed air delivery
  • Perfect Heat™ technology closely manages your comfort by adjusting system operation to changing conditions
  • Perfect Humidity™ technology ensures optimal summertime cooling dehumidification
  • Insulated cabinet for quieter operation
  • Fan On Plus™ technology
314A

Preferred™Series Variable-Speed 80% Gas Furnace

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Model Family: 314A
Annual Fuel Utilization Efficiency: 80% AFUE
Energy Star Rated: N/A
Blower Motor: Perfect™ ECM (PWM) Variable speed
Gas Valve: Two-stage
Inducer Draft Motor:
Fan Heating Operation: Two-stage
Factory Warranty Parts: 10yr parts limited warranty
Heat Exchanger Warranty: 20yr heat exchanger limited warranty
Sound Level: QuieTech™
Manufacturer's Stated Benefits:
  • Perfect Heat® technology means consistent comfort by adjusting system operation to changing conditions
  • Fan On Plus™ technology lets you choose the speed of continuous fan operation with a compatible control
  • Insulated cabinet for quieter operation
310A

Legacy™Line Fixed-Speed 80% Gas Furnace

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Model Family: 310A
Annual Fuel Utilization Efficiency: 80% AFUE
Energy Star Rated: N/A
Blower Motor: Fixed speed
Gas Valve: Single-stage
Inducer Draft Motor:
Fan Heating Operation: Single-stage
Factory Warranty Parts: 10yr parts limited warranty
Heat Exchanger Warranty: 20yr heat exchanger limited warranty
Sound Level: QuieTech™
Manufacturer's Stated Benefits:
  • Pilot-freePerfectLight™ ignition
  • Insulated cabinet for quieter operation
  • Hybrid Heat® system capable
  • Filter cabinet