by B. Leslie Baird

Created on: November 02, 2009   Last Updated: November 03, 2009

Installing a new or replacement furnace is not a job for the average homeowner or DIY enthusiast. Furnace installation requires skills in the form of electrical, plumbing (gas) and sheet metal work. It may, however, help many homeowners to understand the process of furnace installation. For more skilled "do it yourself" homeowners it is possible to install a replacement furnace but this is highly dependant on the skills of the homeowner. Someone that has had considerable experience in construction and skilled trades can undertake the job themselves. It is very important that this installer does have the skills required and follows all safety precautions.

This article is intended to be a guide for swapping a similar new furnace and not for converting from gas to electric or visa versa. A change in the type of furnace being used is a much more complex procedure. HVAC training usually involves a certificate or Associates Degree equivalent with several years of industry experience. HVAC professionals are also usually licensed by the state or area where there are working.

Before beginning any repair or replacement project be sure to turn off all electric and gas supplies. Double check this.

Furnace removal:

Once all power and fuel to the unit has been turned off, it is time to remove the old unit. This is really a two person operation. Gas and/or electric supplies to the old furnace must be disconnected. The thermostat wires need to be disconnected as well. Next, the ductwork and vent piping must be removed. Sheet metal can have very sharp edges and must be handled carefully. If the furnace is connected to a central air-conditioning system this will need to be disconnected as well. Refrigerant handling does require a special license in almost all areas. Remove all screws that attach the furnace to the mounting base. Once all parts have been disconnected the old furnace can be removed from the area.

Installing the new furnace:

Each type of furnace will have a different type of installation procedure. At this point in the replacement, a manual is needed for the exact installation of the furnace involved. In general, the area of installation needs to be clean and free of debris. The new furnace must be set level on the mounting base. The blower motor must be installed if not already in the unit. Duct work and venting must be reconnected. Thermostat wires must be reconnected as well as other electrical connections, and gas lines, if used.

After installation:

Once the

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