From time to time you will need to take action with your furnace and either
- Call a contractor to maintain/clean your furnace
- Maintain/Clean your own furnace
I recommend the latter and will start the discussion here
Furnaces like everything else on the planet need to have maintenance. If you think not then name one thing that never needs maintenance
To correctly maintain a furnace you have to understand what a furnace is doing or a better way to say that is how it functions
All a furnace does is heat air and throw that air into your home by moving the air from one place to another
The machine that does the moving is the blower motor and wheel.
The heat comes from a fossil fuel being burned. Either oil , gas , propane or wood/coal.
When the fuel is burned it is burned inside a piece of metal and that piece of metal is called a heat exchanger. As of lately the heat exchangers have been tubes. They used to be clam shelled pieces of metal.
In the future i believe that heat exchangers will be filled with a substance similar to oil! Oil holds heat a lot longer then air and is a more efficient means to transfer heat from a flame to air inside your home
The temperatures in the furnace have greatly changed as well. It used to be that the temperature was around 150 degrees in the “heat exchanger” before the furnace blower motor would kick on and throw the heat up into your home. All this usually did was make your ceiling very hot and maybe your floor would be around 70 degrees (law of thermodynamics – Cold air is heavier then hot air and will sink and push the hot air up, creating layers of different heat levels in a home or office)
So because we have needed to become more efficient newer furnaces will throw out air when the heat exchanger gets to about 90 degrees. Thats why when you change a new furnace from an old one the air feels cold coming out of the new furnace
Once the thermostat reaches the temperature that satisfies it, the thermostat will shut down the furnace
That basically how the furnace works in your home
There will be a series of how to service this process or maintain this process in your furnace in future writings on the subject here at furnacebook
Look for it under this heading