Electric Furnace
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An electric furnace may have a few different characteristics.

• Electric Heat Elements
  These units work from metals being heated by a certain current flow (either 120v or 240 v).  These can be installed as baseboard heaters, heating wire embedded in ceilings or walls, or panel units built into the wall.  

There are three types of electric heating elements:

A. - Open Wire  B. - Open Ribbon  C. - Tube-encased wire

The building in which the electric furnaces are most efficient are the buildings where the walls and ceilings have been insulated as thoroughly as possible to reduce heat losses.  This will cut the operating cost to a minimum.  Basement walls or the floor slab of buildings without a basement must be insulated.  Windows should be double-glazed.  Wood or plastic window and door frames are preferred, rather than metal.  Walls should have 4" of insulation and ceilings, 7".  The floor slab should be insulated 4" thick and 42" deep.  The basement wall should have 2" to 4" insulation.

Humidity control may require dehumidification rather than humidification.  The building is likely to be very tight.  Relative humidity builds up from cooking, laundry, bathing, pets, and other sources.  Compared to sources of heat that require burning, electric heating produces no draft.  It does no pull excess water vapor out and replace it with direr outside air.