How much should it cool?

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Old 05-23-09, 06:11 PM
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How much should it cool?

Our heat pump was recently repaired, and now cools air about 17 degrees. (e.g. when it's 80 outside, the air from the ducts is 63)

Is this normal/acceptable?
 
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Old 05-24-09, 09:52 AM
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Yep it's in line!!!!!!!!!!!!!!!!!
 
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Old 05-24-09, 05:00 PM
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On a regular a/c, it is the inside cold air return air temp that matters.

On heat pumps, is the outside air (per poster's query)the determining factor? If so, then what degree cooling number (like 63) could poster "anomoly"(or anyone) expect, if it was 100 out (but say the house really was still 75 due to overnight low temp) ?
 
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Old 05-24-09, 05:38 PM
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17 degrees is good indeed as airman says. 20 is the target number that should be hoped for, but other factors could easily prevent this ideal from being reached.

Also, how long did you wait before taking those readings?
You should have waited a good 15-to-20 minutes so the system has enough time to bring the temperature in your house down to steady state conditions.
 
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Old 05-25-09, 05:00 PM
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Originally Posted by anomaly View Post
Our heat pump was recently repaired, and now cools air about 17 degrees. (e.g. when it's 80 outside, the air from the ducts is 63)
Is this normal/acceptable?
The indoor air temp differential depends on the CFM per-Ton of cooling & the humidity level in the home.

If the indoor airflow is between 375 & 450-CFM, then the big factor is the level of humidity or latent load or heat of condensation on the evaporator coils & fins absorbed by the refrigerant& transfered out through the condenser.

The outdoor temp has little effect on the indoor temp split until it gets well above 105-F.

3-ton 13-SEER, 4-ton evaporator; 75 indoor dry bulb; 1434-CFM; 59-F wet bulb or dry air, split 19-F; 63-IWB 18-F split; 67-IWB, 15-F split; 71-IWB, high humidity, only a 10-F split.
 
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