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That will depend entirely upon the type of furnace you have. There are filter less furnaces, so if you have one, you won't need filters. Otherwise, if your furnace requires a filter, you will need to purchase filters and replace them regularly. If you have the owners manual, that will tell you if the furnace needs a filter.
How can you covert an oil furnace to an electric furnace
Their is no difference between an ashing furnace and a muffle furnace
form_title= Outdoor Wood Furnace form_header= Stay warm with an outdoor wood furnace. What is your budget for a furnace?*= _  What size furnace do you need?*= _  Where will the furnace be installed?*= _ 
form_title=Furnace Cleaning form_header=Ensure the longevity of your furnace by getting it cleaned by a professional. How old is your furnace?=_ Has your furnace ever been surfaced before? = () Yes () No () Unsure If so, when was it last serviced? =_ What type of furnace do you have?=_
Furnace is an enclosed fire place show me parts of a coal fired furnace
an electric furnace runs off of 208/230 Volts while a typical gas furnace runs off of 120 also a gas furnace will have a valve for the gas relay where the gas enters the furnace.
i sold my furnace to Satan
A blast furnace.
The Furnace was created in 2002.
Out of the Furnace was created in 2013.
Out of This Furnace was created in 1941.