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Old 03-11-11, 06:05 AM   #3
S-F
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You might want to use an air source heat pump if you are going to have NG also. A ground source unit could be pretty expensive to install and an air source unit will still give you decent efficiency. It's efficiency would actually be plain great when it's a little warmer. Imagine you have a 97% efficient gas furnace, but under the right conditions an ASHP would be more than 100% efficient.
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