How Long??

[flajoker]

It is currently 80 degrees outside. If heatpump is proper size, how long to cool from 72 to 70 degrees. System is new infinity system.

[Toolpusher]

I'll guess 1 hr, if you use the a/c side.
Never, if you use the h/p side.

I don't know why I had to say that,
Maybe because it's only in the low 40's here.
And your in t-shirts & shorts. Lucky you.

[mrssb]

It depends...there are more factors than just the ambient outdoor temperature. Would need some more info than what you have provided to completly answer your question.

[flajoker]

Why do you say never? What happens when it is 95 degrees outside? Is it going to be 85 in the house?

[conrad1]

Originally posted by flajoker
Why do you say never? What happens when it is 95 degrees outside? Is it going to be 85 in the house?

read your post and you should see why Because the heat pump side heats and the a/c side cools just in case you still did not catch it
sorry just feeling a little well you can read!

[Shophound]

Originally posted by flajoker
Why do you say never? What happens when it is 95 degrees outside? Is it going to be 85 in the house?

Tool was just yanking your chain because his weather's still chilly and you're running your heat pump in cooling mode, wondering how long it's supposed to take to pull your house temp down two degrees with an 80 degree outdoor ambient temp.

Last Sunday I flipped on my home system when it was in the low eighties outside. It pulled the house from 74 to 70 in about twenty minutes. That's because the previous owner of this domicile oversized the system, thinking that when he took in the garage it justified bumping the capacity up a full ton (for just 300 additional square feet!). Either that or a contractor sold him that idea.

However, as you can see there's lots of variables regarding your question. What if my system was properly sized for my house under the same conditions as above? Maybe ten more minutes run time? Again that would depend on how well the duct system moves air, how airtight and insulated the ducts are, the dry and wet bulb temperatures, heat load on the house, infiltration, etc etc.

[docholiday]

13minutes and 47 seconds. j/k

I dont know that anyone can answer the question with any accuracy but I can tell you that if proprly sized and assuming moderate humidity levels 80 outdoors and 72 in the home is hardly a load on the system. It shouldnt take long.

[Twilly]

Doc? Is that moutain time, or eastern time? Also after making the necessary calculations you forgot to subrtact the cooling effect of a cold can of beer which would deduct 3 secinds from your calcualtions. Without the beer Doc is correct with the beer deduct 3 seconds.

hope that helps.

[beenthere]

Is your infinity single stage or 2 stage, are you using the infinity stat.

If it has humidity controls it will take longer because it is trying to control the humidity, instead of just removing sensible heat.

[dash]

Originally posted by beenthere
Is your infinity single stage or 2 stage, are you using the infinity stat.

If it has humidity controls it will take longer because it is trying to control the humidity, instead of just removing sensible heat.

Exactly!

Plus with 2 speed/stage it can stay in low for a low time.