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Old 09-27-2009, 02:05 PM   #1
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heat pump vs. air handler tonage


Looking to get two 1.5 ton heat pumps ... this is the tonage needed/recommended for each floor of my house after a manual J calculation. I want the option of a variable speed fan motor on the indoor unit, but in order to get the variable speed air handler the air handler will be at 2.5 tonage. The dealer says the difference in tonage between the air handler and heat pump is OK, but I'm not sure.

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Old 09-27-2009, 02:31 PM   #2
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heat pump vs. air handler tonage


Could be. Can't tell since you didn't tell us what brand or model.

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Old 09-27-2009, 05:33 PM   #3
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heat pump vs. air handler tonage


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Could be. Can't tell since you didn't tell us what brand or model.
It's going to be a Bryant Legacy series or an American Standard Heritage 14 (or 15 possibly) - Premium series. R-410A for both
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Old 09-27-2009, 05:59 PM   #4
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heat pump vs. air handler tonage


Bryant doesn't rate their air handlers by the ton.

Trane does. And sometimes they have to be rated larger then the outdoor to get the efficiency.
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Old 09-27-2009, 09:35 PM   #5
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heat pump vs. air handler tonage


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Bryant doesn't rate their air handlers by the ton.

Trane does. And sometimes they have to be rated larger then the outdoor to get the efficiency.
Ok, thanks. I really want the variable speed ... sounds like it'll be alright under the scenario I wrote in this post.
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Old 09-27-2009, 11:05 PM   #6
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heat pump vs. air handler tonage


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Originally Posted by J Fulks View Post
I want the option of a variable speed fan motor on the indoor unit, but in order to get the variable speed air handler the air handler will be at 2.5 tonage. The dealer says the difference in tonage between the air handler and heat pump is OK, but I'm not sure.
Just make sure the available speeds on the air handler cover the smaller condenser units capacity (ie 600CFM, nominal). Are you looking to accomplish anything in particular with the VS motor?
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Old 09-27-2009, 11:48 PM   #7
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heat pump vs. air handler tonage


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Just make sure the available speeds on the air handler cover the smaller condenser units capacity (ie 600CFM, nominal). Are you looking to accomplish anything in particular with the VS motor?
Will do, sktn77a. Thanks.

Well, I've heard variable speed is a little more efficient, takes more humidity out of the air, and I heard that when the unit kicks on in the winter there's not this blast of cold air that comes out as is the case with non-variable speed air handlers.

Practically speaking, is it really worth the extra cost? Are there more problems associated with VS air handlers than not?
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Old 09-28-2009, 05:03 AM   #8
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heat pump vs. air handler tonage


If installed improperly there can be.

If installed correctly no.
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Old 09-28-2009, 08:35 AM   #9
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heat pump vs. air handler tonage


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If installed improperly there can be.

If installed correctly no.
As a construction contractor, I'm certain this dealer is the best installer in the area. They're just a little higher than everyone else, but the dealer himself is part of every install. I'm just not knowledgeable enough with HVAC to to know if there'd be problems in air handlers bigger than what is required, and I didn't want to make the dealer mad by second guessing his quote unless I had to. I'm realizing there is no VS in the lower end models of these brands, so to give me a VS air handler he's had to jump up into the higher end models of these brands. Just wanted to be sure it's OK to mix a higher end/larger than needed air handler with a lower end/properly sized heat pump, from the same manufacturer.
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Old 09-28-2009, 10:35 AM   #10
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heat pump vs. air handler tonage


Its quite common with several brands.
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Old 09-28-2009, 03:42 PM   #11
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Its quite common with several brands.
Thanks beenthere ... that puts me at ease.

Take care,
James

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