Heating Air Conditioning Problems

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Q
 Why does my furnace not immediately come on ?
After I adjust my temp control there is a 5 minute delay 
before it even starts. Is this normal?
Q
What Maintenance Can I do Myself?
Q
When should I replace my furnace?
Q
I recently moved into my first home(condo). 

Since I have lived here I have experenced dry itchy skin. Dry 
sore throats when I wake up and a feeling like I can't get 
warm, even with the thermometer set to 72 degrees. My 
Father says I need a humidifier. What do you think?
Q
The ignitor on my furnace will not glow. I have checked the 
pressure switch and it is putting out 28 volts so I think it is ok. 
I checked for continuity on the ignitor and flame sensor. I 
have continuity so I think it is ok. The lilit switch has 
continuity. I changed the control board as well. What else 
shoul I do and how, please?
Q
It seems like the blower just blows cool air for 5 minutes. is 
this normal? How do Furnace Fans and Blowers work?
Q
My pilot light keeps going out, what do I do?[
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