Furnace replacement is important in home maintenance and should not be taken lightly. It can be time-consuming and complicated, so it’s important to understand how long it will take to complete this task. The answer to this question depends on the size and complexity of the furnace, as well as the experience level of the person doing the work. Generally speaking, a furnace replacement can take between four and ten hours.

Factors to Consider When Selecting a Furnace

Replacing a furnace is an important decision that should be taken with seriousness. The size and layout of your home will play a major role in determining what size of furnace you buy. There are several factors to consider when selecting a furnace, including the size of the home, the type of heating system, and the climate in which you live.

  • Size

When it comes to size, you will want to buy a large enough furnace to heat your entire home but not so large that it wastes energy. The size of your home will help determine what size of furnace you should buy—generally, the larger the home, the larger the required furnace. The type of heating system you have can also influence the size of the furnace you will need. If you have a forced-air system, you will need a larger furnace than a radiant system, which can be heated with a smaller unit.

  • Layout

In addition to size, it is important to consider the layout of your home when selecting a furnace. If you have a large home with multiple levels, you may need a larger unit than a smaller home with fewer levels. Additionally, you may need a specifically designed furnace if you have a basement or attic.

  • Amount of Energy Efficiency

When selecting a new furnace, you have the option to choose the amount of energy efficiency you want. The Annual Fuel Utilization Efficiency (AFUE) rating is the most commonly used energy efficiency measure. This rating is a percentage, with higher percentages indicating a more energy-efficient furnace. A furnace with an AFUE rating of 90% or higher is considered very energy-efficient.

Need a Furnace Replacement? Call the Professionals

Regarding furnace replacement, the professionals have the experience and knowledge to ensure the job is done correctly. They can recommend the best type of furnace for your home and install it correctly. They will also be able to identify any potential issues with your current furnace and advise you on the best way to proceed.

In addition to the expertise and tools needed for furnace replacement, they will also be able to provide you with the necessary safety precautions. This includes checking for gas leaks, verifying the electrical connections are secure and ensuring the installation meets local building codes.


It is important to consider the complexity and size of the furnace when determining how long it will take to replace it. Smaller units may take only a few hours to install, while more complex systems can take longer. It is advisable to call a professional to assess the situation and provide an accurate estimate of the time required to install the new furnace. Professionals have the experience and knowledge to determine the best type of system to fit the home’s needs and the expected completion time. With their help, you can be sure you’re getting the best replacement possible for your home.

Does your home need a furnace replacement in Louisville, KY? Thompson Heating & Cooling got you covered. Since 2003, we have been providing quality whole-home comfort services to residents of La Grange, Louisville, and the surrounding areas, using top-quality products from manufacturers such as Ruud, Mitsubishi, ClimateMaster, and Nest. Get in touch with us today!

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