The above are two good, and siilar in approach answers, but there are two issues it seems no one includes:
1) If you house was built before 1978 it must be inspected by a certified contractor or lead ... read more
We have written on good bit on this subject: Please take a look at these blogs we wrote!
http://blog.akatlanta.com/2010/11/10-mistakes-not-to-make-when-heating.html
http://blog.akatlanta.com/2010/11/7 ... read more