Nov 01, 2011 by Alagasco

Shopping for a Natural Gas Furnace

No one looks forward to replacing their natural gas furnace, but if your furnace is more than 15 years old, it may be time to upgrade to a more energy-efficient model.

Before purchasing a new furnace, here are some things to consider:

  • Determine your size requirements. It’s a fact that a properly sized furnace will operate most efficiently. Make sure that the HVAC contractor uses a correct sizing calculation before you sign a contract. A “Residential Load Calculation” is the recommended method for use in the United States.
  • Decide on an efficiency factor (EF). Energy-efficiency improvements will help you save money on a new furnace because you will need a smaller system. High-efficiency furnaces may cost more initially, but the long-term costs of operating will actually save you money in the long run.
  • Consider your venting options. Every natural gas central heating system requires venting, however, you can now vent a natural gas furnace directly through a basement wall, which reduces the cost of installation and maintenance.
  • Comparison shop for the best pricing. From the actual product to the services offered, call around to make sure you’re getting the best deal on product, installation, warranties and service support. Obtain estimates from a qualified contractor. Ask critical questions such as: Does the warranty cover equipment and installation? What is the product availability? What is a typical cost of service and maintenance?
  • Look for a reputable contractor. Make sure the contractor you select is licensed and insured. Click here to locate an Alagasco Gas Advantage Contractor.
  • Remember, to ensure optimal performance, always follow the manufacturer’s recommendations for use and maintenance, including an annual inspection of the heating and venting system.

Now, if you are considering replacing your electric heat pump with a new high-efficiency natural gas furnace, here are a few facts that my help you with your decision.

  • A combination of a new high-efficiency natural gas furnace and a new cooling system can save up to $1,300  a year in operating costs.
  • Natural gas furnaces can last up to twice as long as electric heat pumps.
  • Natural gas furnaces are up to 97% efficient.
  • Gas furnaces deliver heat up to 25 degrees warmer coming out of the vent – and they’re quicker at doing it.

How much does it cost to convert from electric to natural gas?

This depends on several variables. Costs vary upon whether you already have a gas line run to your house. If you do, the cost is much less. If you already have natural gas, the best way to get an estimate is to simply contact one of our Gas Advantage Contractors. If your home is all electric, and you’re interested in switching to gas, call us at 1-800-292-4010.

The good news is that Alagasco offers a rebate up to $1,000 when you switch from an electric heat pump to a natural gas furnace and a new cooling system. Just click for more information on natural gas furnace rebates.


Alagasco, your natural gas partner, provides clean, energy efficient natural gas to approximately 437,000 homes, businesses and industries in central and north Alabama. To report a gas leak, a line break, or any other gas service emergency, please call 1-800-292-4008. For other inquiries about your account, service or billing, you can reach us via email or phone.

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