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Home > Archive > Heating and air conditioning > February 2006 > 3.5 or 4 ton?
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| havin_aball@yahoo.com 2006-02-10, 1:21 pm |
| South Florida
2970 sq ft (600 sq ft is upstairs)
2-story
vaulted ceilings downstairs
2.5 ton cools upstairs, plus guest bedroom downstairs
need new a/c for downstairs
Two different Trane contractors have offered opinions
Trane 15i 3.5 ton
Trane 19i 4 ton (not available in 3.5 ton)
These units will have rebates available effective 3-1-06
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| havin_aball@yahoo.com 2006-02-10, 1:21 pm |
| Forgot to mention, the old unit is a 3.5 ton with a 4 ton air handler
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| .p.jm@see_my_sig_for_address.com 2006-02-10, 1:21 pm |
| On 10 Feb 2006 08:53:21 -0800, "havin_aball@yahoo.com"
<havin_aball@yahoo.com> wrote:
alt.home.repair, not here
>South Florida
>2970 sq ft (600 sq ft is upstairs)
>2-story
>vaulted ceilings downstairs
>2.5 ton cools upstairs, plus guest bedroom downstairs
>need new a/c for downstairs
>
>Two different Trane contractors have offered opinions
>Trane 15i 3.5 ton
>Trane 19i 4 ton (not available in 3.5 ton)
>
>These units will have rebates available effective 3-1-06
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| Noon-Air 2006-02-10, 4:21 pm |
| What did the Manual J heat load/loss calculation say??
<havin_aball@yahoo.com> wrote in message
news:1139590639.990679.108570@g44g2000cwa.googlegroups.com...
> Forgot to mention, the old unit is a 3.5 ton with a 4 ton air handler
>
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| Al Moran 2006-02-10, 11:21 pm |
| On 10 Feb 2006 08:53:21 -0800, "havin_aball@yahoo.com"
<havin_aball@yahoo.com> wrote:
>South Florida
>2970 sq ft (600 sq ft is upstairs)
>2-story
>vaulted ceilings downstairs
>2.5 ton cools upstairs, plus guest bedroom downstairs
>need new a/c for downstairs
>
>Two different Trane contractors have offered opinions
>Trane 15i 3.5 ton
>Trane 19i 4 ton (not available in 3.5 ton)
>
>These units will have rebates available effective 3-1-06
Thats nice.
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| udarrell 2006-02-11, 10:21 am |
| havin_aball@yahoo.com wrote:
>South Florida
>2970 sq ft (600 sq ft is upstairs)
>2-story
>vaulted ceilings downstairs
>2.5 ton cools upstairs, plus guest bedroom downstairs
>need new a/c for downstairs
>
>Two different Trane contractors have offered opinions
>Trane 15i 3.5 ton
>Trane 19i 4 ton (not available in 3.5 ton)
>
>These units will have rebates available effective 3-1-06 -
>old unit is a 3.5 ton with a 4 ton air handler
>
A manual J heat-gain heat-loss is an absolute requirement!
With Vaulted ceilings adjust supplies and Returns so the air is allowed
to stratify in the vaulted area as this saves a lot of conditioning.
Do NOT oversize the unit in a high or moderately high humidity climate
or most of the high SEER ratings will be lost!.
South Florida, summer outdoor design Key West 90-F dry bulb, 78-F wet
bulb around a 58% relative humidity
Miami 90-F dry bulb, 77-F wet bulb around a 54% relative humidity.
Tampa, 91-F dry bulb, 77-F wet bulb around a 53% relative humidity.
It is much more difficult to get 19 SEER than 15 SEER, the initial cost
should also be much less for the 15 SEER
You might only get around 15 SEER with the 19 SEER Condenser.
I am NOT there, but in general do what you can to reduce the heat-gain
and go with what the manual J calls for.
I would rather be slightly undersized than oversized as there are always
things you can do to reduce the heat-gain and heat-loss!
http://www.udarrell.com/proper_cfm_...ng_systems.html
- udarrell.com
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| Bob Pietrangelo 2006-02-12, 10:21 pm |
| The benefit of the XL19i is that it has 2 compressors. One is a 2 ton and
the other is a 4 ton. The benefit is that in the milder days when that
humidity is super high, the unit will run longer to dehumidify. With the
XL15i you have a 3.5 ton unit. I would either use the XL14i, the XL16i a 2
stage , but 70/30, or the XL19i. Definitely get a full manual J performed
prior to choosing anything
--
Bob Pietrangelo
bobp3@comcast.net
bob@comfort-solution.biz
www.comfort-solution.biz
On Time or Your Service Call is FREE
Preventive Maintenance Specialist
<havin_aball@yahoo.com> wrote in message
news:1139590401.080524.83020@g14g2000cwa.googlegroups.com...
> South Florida
> 2970 sq ft (600 sq ft is upstairs)
> 2-story
> vaulted ceilings downstairs
> 2.5 ton cools upstairs, plus guest bedroom downstairs
> need new a/c for downstairs
>
> Two different Trane contractors have offered opinions
> Trane 15i 3.5 ton
> Trane 19i 4 ton (not available in 3.5 ton)
>
> These units will have rebates available effective 3-1-06
>
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