How to Install a Natural Gas Furnace

If you need to have your natural gas furnace replaced the cost could be downright outrageous. Some homeowners are taking matters into their own hands and replacing furnaces themselves. When installing a natural gas furnace, you should exercise extreme caution. Dealing with gas can be very dangerous even for trained, experienced professionals. Be sure that you have all the tools and materials needed before you get started. Make sure to assess your home. Know how old your windows are, the type of insulation you have and is there any air infiltration. Be sure to have the right sized furnace for your home. Also check to make sure the ducts will fit as the newer furnaces are smaller units.

Step 1 - Power Down your Natural Gas Furnace 

Shut off the power and gas supply to your furnace. Just locate the shut off valve that is near the furnace and turn the valve a quarter of the way. Secure your ducts with cleats and screws. Be sure to check your duct work for any wear and tear. If there are any, you will have to replace the duct work. Remove your old furnace and make space to install the new one.

Step 2 - Align the Furnace

Now we are ready to install the new natural gas furnace. Align the furnace with the existing duct work and gas pipes. Doing so will cut down on a lot of work in the long run. Install any doors, latches, wires and switches to the internal furnace.

Step 3 - Transition your Natural Gas Furnace  

Begin the transition phase by connecting the plenum, or the duct work leaving the old furnace, to the new furnace. To be sure that the duct is securely attached to the natural gas furnace use a clamp. Also attach the boot to the new furnace.

Step 4 - Install your Natural Gas Furnace  

Connect the gas line to the furnace and check it for leaks. You may want to use a gas leak detector for this step. You can remove any released gas by running the flue pipes. Now you can connect the thermostat and the power supply. Before lighting the furnace wait at least 5 to 10 minutes. Leave the room for awhile and then come back in to see if you can detect the smell of natural gas. If there is no smell then that means there are no leaks. You can light the pilot of the furnace using the instructions given by the manufacturer.

After you have successfully installed your new natural gas furnace turn it on and try it out. Remember to follow the manufacturer’s instructions as to how the furnace goes through its initial run. Follow these instructions carefully. Allow about 1 hour for the entire house to get warm.