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Two stage vs variable speed motor

Post created: 2013-01-02 Type of Equipment: Furnace Views: 266

On 2013-01-02 JB wrote:


The following link has an interesting discussion of the merits of each: http://ths.gardenweb.com/forums/load/hvac/msg0501090812138.html. One of the things I found interesting is that they talk about matching variable or two stage to the house and the duct work that you have. That may make a difference.

This discussion is also informative: http://hvac-talk.com/vbb/showthread.php?167647-New-Furnace-Two-Stage-vs-Two-Stage-with-variable-speed.

And for a great description of the differences and merits of each go here: http://www.cwaohio.com/learningcenter/articles/typesoffurnaces.htm.


On 2013-01-02 John Weber wrote:

Thanks for the quick answer, those links were very helpful.. I just replaced our fan that was going out along with the fan on one of our zoned furnaces. I was just trying to understand the difference as we were told we could put in a variable speed motor and it would be quieter and more comfortable. But we had several bids and one of the guys said we couldn't even get a VS motor for our 11 year old Carrier furnace(he was also the cheapest bid by far). One of the salesman was also discussing 2 speed motors and that just seemed to confuse the issue.

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