Posted by Penny,
They are cheaper to operate over time but more expensive to purchase as they run the the $3,500 and up range.
On the pro side this type of furnace maintains constant temperature and is relatively inexpensive to operate. It will certainly be an improvement over your current furnace and will save you money in the long run.
If you do not have access to a gas line the sealed oil furnace is a great option. They use variable speed blowers to maintain the temperature. They are a quieter option and they don’t require the same type of venting.
Purchasing the correct size furnace that is installed by a reputable contractor with a long warranty are as important as the type and brand of furnace you choose.