Your A/C removes humidity while it is running. With a oversized system it will not run enough to keep the humidity at a comfortable level. The heat pump must be sized for the cooling load.
Its a good Life!
SEER is based on EER. Without EER, there is no SEER.
Originally Posted by dash
EER can be calculated for all ambient temperatures, but it is published by the ARI at 95F. EER is for steady-state conditions and doesn't account for on/off cycling or time for the system to reach full efficiency. SEER accounts for non-steady state operating conditions, but uses a "seasonal" range of temps which I believe are not realistic.
Here are EER numbers for my 3-ton GSH 14 SEER Goodman heat pump based on ambient temps, and 80F indoor dry bulb, 67F indoor wet bulb (ARI rating conditions):
As the outdoor temps drop, the system efficiency increases because more btu's are removed while using less electricity.
SEER is geared towards the lower temp ranges where EERs are the highest. Combine this with a condenser's ability to run on first stage, where EER is higher on first stage than second stage, and you get a high SEER#.
A high SEER, 2-stage condenser reduces operating cost when it runs on first stage because of its high EER on first stage, reduced on/off cycling, and the ability to lower humidity allowing for an increase in setpoint temp.
However, the cost difference between a 2-stage condenser and a single stage condenser can rarely be justified based on reduced electric consumption over the life of the equipment.
The system can be design(factory) to optimize efficeincy at any given temperature.
If EER at 95 was the only concern,systems won't have the SEER they have due to designing/optimizing for 95.
"but uses a "seasonal" range of temps which I believe are not realistic."
Believe what you want.
Neither number is achieved ,without out a great install ,and duct design,so it doesn't matter much in the overall scope of things.
Thanks for the reply Dash!
However, can anyone answer the difference between the top of the line Bryant and Carrier Hybrid heat pump?? Bryant claims as high as 18 SEER as Carrier claims 19 SEER? Is it the exact unit, just different ratings as Carrier is the top model??
Thanks for any insight,
This up to as high as X SEER thing 'is where they build one model that higher then the rest of the sizes in that series.
Originally Posted by MikeC78
So, my guess is that one model that Carrier has with higher SEER is the only one that is different ,as far as SEER goes.There are other differences ,like noise level between the brands.
And of course the Carrier cabinet is prettier! lol!!