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Old 12-07-2009, 05:58 AM   #1
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heat pump / BTU question


I have a 2.5 ton heat pump now. When the heat pump kicks on, it doesnt really throw much heat in the "heat pump" seating. when its gets @ 35-40Deg, it takes forever...like 3 -4 hours to raise the temp from 68 - 71 or 72 deg. If I go to a 3 ton unit, does that mean more BTU per hour and ultimatly healping to raise the temp faster? without having to use Aux heat?

My house is 1600 Sq feet, cape code, with an additonal 700 Sq feet in the basement that is finished. I am wondering if I am right on the line of going to a 3 ton system. Just wondering if the larger system will help my concern.

Thanks
Jeff

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Old 12-07-2009, 06:16 AM   #2
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heat pump / BTU question


Your current system may need service.
Could be low on refrigerant, on overcharged.
Could be your duct system is too small.
Increasing to a 3 ton, could help, or make matters worse.

How old is your current heat pump.

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Old 12-07-2009, 06:32 AM   #3
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heat pump / BTU question


current system is 18 years old. Need to replace it. I beleive I have a 12X10 metal run upstais and then it branches out with 4 6" flex runs. all the rooms downstairs are also 6" runs, but not flex.

I guess I never thought about it needing recharged. Can a contractor do a simple check to see if the refrigerant is low?
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Old 12-07-2009, 06:40 AM   #4
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heat pump / BTU question


A good contractor yes.

At 18 years. Its not a heat pump that was good at putting out heat when it was new. As far as they lost heating ability quickly.

It wasn't until late in the 90's that they started to improve on heat output at lower temps.

I'd have it checked, to see if its working to its capacity first. But, at 18 years. It is time to think about changing it out.

Newer heat pumps have better performance curves at lower temps. So a new 2.5 ton, will provide you with more heat then this one did when it was new. And only 35 outside.

Is that 10X12 run sheet metal that is insulated on the inside. If so, then its only 9X11, or 8X10 on its inside dimension. And that isn't very large for the supposed 400 CFM they thought they would get out of those 6" runs.
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