Yes you can but why would you want to preheat the air, it should already be around room temperature.
You must have a heat pump with electric auxilliary heat.
No different than any other house. Heat ducts can be put into the slab when it is poured or they can be run through the attic and walls and a forced air furnace is used. Wall furnace, baseboard heat or they could have radiant heat in the floor.
Air flows in a furnace from the return ducts into the furnace, where it is heated and then pushed out through the supply ducts to heat the home.
Insulation helps to prevent heat loss. The attic tent covers the entrance of the attic to prevent heat from escaping. As a result, one will save money on their electric bill by using an attic tent, and it is also eco-friendly.
The air flows into the furnace through the return ducts, gets heated by the furnace, and then flows out through the supply ducts to heat the home.
Yes,It depends if it is gas fired or electric.
Air flows in a furnace system from the return ducts, through the furnace unit where it is heated, and then out through the supply ducts to heat the home.
The efficiency of an electric furnace can vary but typically ranges from 95-100%. This means that most of the electricity used is converted into heat, with very little wasted energy. Regular maintenance and proper installation can help optimize the efficiency of an electric furnace.
normally 8 gauge wire is used for electric heat furnaces.
Not if it was disconnected properly
If you mean an electric furnace then normally it is nichrome. a heating element in a heat strip is made of what type of wire
No You can't cover the return air. Because the limit switch in the furnace will trip. If the furnace was working ok before I will check for air leaks in the return air. Good luck