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Bisbee

09:47AM | 09/30/05
Member Since: 09/29/05
1 lifetime posts
Bvhvac
We are replacing our furnace and are trying to decide whether to put the new furnace under the house or in the attice.

We currently have a floor furnace, with all of the heat coming out of one big register in the middle of the house. We are replacing it with a forced air furnace, with ducts going to each room. The house is 1279 square feet.

We've had several people come and give estimates, and the most reasonble of them suggested that we put the furnace in the attic so we don't have to deal with the ductwork taking up space in the basement. I'm wondering about the efficiency of a system in the attic, with registers in the ceiling, versus one from the basement, with registers in the floor.

Any input/advice is much appreciated.

Jennie

bravey

10:21PM | 10/04/05
Member Since: 06/23/04
162 lifetime posts
Heating systems work best with the grilles in the floor since the warm air is delivered low and rises by convection. Air delivered at the ceiling from an attic system has a greater tendency to stratify especially in high ceiling situations. The heating system is just like a human, it works best in a comfortable environment. Anyplace with extreme heat or cold is harder on the equipment. In winter, basements tend to be slightly warmer than attics, thus the ducts and fan unit loose less heat nad lower frequency of maintenance. Ideally, the whole system would be located within the conditioned space of the house. Vertical heating units are slightly more efficient than horizontal units. Most of these advantages suggest a basement installation. Attics tend to have poor access and very restricted installation space. Installation costs are usually less for attic systems.

Regards

timco576

06:29PM | 10/13/05
Member Since: 10/07/05
21 lifetime posts
I think bravey is right on. Also, units installed in the attic tend to allow drafts to form at the floor level when the unit is not running. This is not very comfortable, as youe feet and legs get chilled in between furnace cycles.
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