Merit® Series Gas Furnaces Provide Reliable Heat When You Need it Most

You’ll find a full selection of affordable and efficient gas furnaces at Hammack Service Company in Richardson. Our Merit Series products offer high annual fuel utilization efficiency (AFUE) ratings, which measure how efficiently the equipment converts fuel to energy. Our systems are also made for reliability and a long product life, providing comfort and warmth on even the coldest days of the year. Find specifics about each system below, and call us at 972-351-8874 or set up an appointment online to talk to one of our team members a gas furnace replacement for your home.

ML180 Gas Furnace

Economical is the perfect word to describe the ML180 gas furnace. Its 80% AFUE efficiency rating*, meaning the equipment efficiently converts energy into heat, and the sealed blower compartment keeps this heat inside to decrease losses and improve efficiency. This product is also affordably priced to fit nearly any budget.

  • Insulated blower compartment helps minimize operation noises and make your home more peaceful
  • Dual-fuel capability enables you to connect the furnace with an electric heat pump and alternate between gas and electric heat for the most efficient energy use possible
  • Duralok Plus® heat exchanger increases reliability and efficiency
  • Hot surface igniter – controls operation to maintain a reliable and efficient performance
  • 20-Year Limited Warranty on heat exchanger
  • 5-Year Limited Warranty on covered components (this product may be eligible for valuable 10-year Limited Extended Warranty coverage)
ML180 Gas Furnace
Efficiency Rating (SEER): 80
Price Guide: $

ML180E Mid-Efficiency Gas Furnace

The ML180E uses Power Saver™ technology to create an cost-effective and reliable furnace. By adjusting airspeed to demand, its constant torque motor runs more efficiently than a standard motor. In fact, it’s 33% more efficient. And a tightly sealed blower compartment limits air leakage to 1%, keeping you and your family more comfortable. This furnace also features:

  • Efficiency rating of up to 80% AFUE1—which can reduce utility costs.
  • Power Saver™ constant torque motor changes airspeed to demand, minimizing energy use for heating and cooling.
  • iComfort®-enabled technology, when connected with an iComfort® E30 Smart Thermostat, can save you more on utility costs.
  • Dual-fuel capable—Use with an electric Lennox® heat pump for top efficiency.
  • SureLight® hot surface ignition ensures longevity for your furnace.
  • Sealed blower compartment reduces heat loss.
  • Duralok Plus™ Heat Exchanger is made from strengthened ArmorTuf™ aluminum steel.
  • Robust blower assembly tops industry guidelines for even temperatures, improving comfort.
  • Durable steel cabinet is made to last with a sturdy, yet attractive finish.
  • Air filter and humidifier compatible.
  • 20-Year Limited Warranty on the heat exchanger.
  • 5-Year Limited Warranty on all remaining covered components.
  • 10-Year Limited Extended Warranty with product registration—ask Hammack Service Company for more information.2
ML180E Mid-Efficiency Gas Furnace
Efficiency Rating (SEER): up to 80
Price Guide: $


1Annual Fuel Utilization Efficiency (AFUE) measures how efficiently an appliance converts fuel into heat over the course of a year. 
2Covered components may be eligible to receive a 10-year warranty. Online equipment registration at is required within 60 days of installation (except in California and Quebec) or the Lennox® base warranty will apply. Applies to residential applications only. See actual warranty certificate for details.
Note: Due to Lennox’s ongoing commitment to quality, specifications and ratings are subject to change without notice.


Hammack Service Company can assist with all your gas furnace replacement needs. If you’re needing gas furnace repairs or maintenance in Dallas, our staff has you covered. Just give us a call at 972-351-8874 or use our online scheduler to set up an appointment.

* Annual Fuel Utilization Efficiency (AFUE) measures how efficient the appliance is in converting its fuel’s energy into heat over the course of a year.