How to Install a Furnace: 6 Installation Steps

A furnace generates heat for a specific facility. The newer models can save you over a hundred dollars a year compared to older and less efficient models. The new models are also quieter and energy-efficient, keeping your monthly energy bills at its lowest. You can actually save almost $4000 in 5 years. Most importantly, furnaces can help keep you warm during the harsh winter months.

A professional company offers a furnace installation price that will cover everything from start to finish, including the removal of your old furnace. Professional companies also offer warranty on parts and labor with annual maintenance. Some can provide ongoing repairs with access to technicians 24/7 after the installation. Additionally, a professional will assess the facility, determine the inside and outside temperatures and study construction details of the facility to determine the exact fit for your furnace unit.

Whether you contact a professional furnace installation service or do it by yourself, here are the six steps on how to install a furnace:

1. Choose the right furnace model

The first and most important step is to select the right type of furnace for installation. Research companies that sell Energy Star units and provide a wide selection to choose from. You want to consider the design, technology comfort, temperature control and distribution, multi-speed or variable speed blowers, noise level, and motor speed. Check to see if the unit has been tested at a research lab.

Look for models that evenly distribute the heat to eliminate cold spots and constantly adjust airflow to match heating needs. You can look for a company that not just sells the unit, but also offers to install and ensure that the furnace is working according to the manufacturing specifications.

2. Remove existing furnace

You probably already have an old furnace, and you are replacing it with an energy-efficient model. Before you install a furnae, you can look at how your old furnace is connected. This is an important step to help you know where and how to place your furnace in the exact location.

You have to be careful when removing the furnace from your existing ductwork. Before removing the furnace system, ensure to turn off the power, remove all electric wires and turn off the gas supply.

3. Check the duct and drain

The process of how to install a furnace involves a lot of check-ups. First, you have to check the duct and drain, which will determine how you place your furnace. The duct system supplies the right amount of airflow, while the drain system should effectively drain the condensate generated.

The existing ductwork should be reviewed before the installation as newer furnace units may require more airflow and the existing duct system should be able to accommodate the additional airflow for optimal performance. The connection between the new fittings should be air sealed to prevent any air leaks. You can consider metal foil tape or duct sealant to do the job.

4. Connect vent pipe and gas supply

Your venting system should be installed properly to provide combustion air to the furnace directly from the outside. This system is very important as it directs gases out of your home. The vent pipes should slope back to the furnace to allow for proper condensate drainage.

Now, you can connect the gas supply to the furnace by connecting the pipes. There is a shutoff valve installed outside the unit and this is where you will connect the gas pipes. With an existing furnace, you will already have a gas line, so little work is needed. But you do have to check the gas pipes for any leaks. Use a gas leak detector for a thorough check.

5. Install electrical supply and thermostat

At this step, you are installing power to the furnace control board, including connecting the thermostat. If you are not familiar or not confident about the electrical system, it would be best to call in the professional. Before starting your furnace, verify that all your wiring meets the specifications as indicated in the manufacturer or instruction manual.

6. Check the furnace installation

Professionals will complete a phase called commissioning, which is a test to ensure that the furnace is operating as per the manufacturing specifications. They will verify and adjust the furnace system to match all specifications. These tests are completed with the help of sophisticated instrumentation. Once these steps are complete, the professional or yourself can turn on the furnace. Follow the manufacturer’s instructions on letting a new furnace run for the first time.

It may be tempting to install the furnace by yourself to save a few dollars, but it is always good to call in the professionals. They will carry out all the essential steps for proper installation as the installation is a complicated process that involves several components such as electrical, ducting, plumbing and gas. These complications will definitely require HVAC expertise.