SEER vs EER
What is the relationship between the SEER rating of a heat pump and the EER rating. From what I have seen, generally, the higher the EER the higher the SEER, but I have also seen two units have the same SEER but not the same EER.
SEER verses EER
We receive this question frequently, thus in a nutshell, the “S” is an abbreviation for Seasonal (an average) adjustments of EER.
EER: (Energy Efficiency Ratio) The ratio of the cooling capacity of the air conditioner in British Thermal Units per hour, to the total electrical input in watts under ARI-specified test conditions.
Please See Air-Conditioning and Refrigeration Institute, a non-profit organization composed of heating, air conditioning and refrigeration manufacturers for actual details. ARI publishes standards for testing and rating heat pumps and air conditioners. www.ari.org
SEER: Seasonal Energy Efficiency Ratio. A measure of cooling efficiency for air conditioners and heat pumps. The higher the seer, the more energy efficient the unit. The government's minimum SEER rating is 13. Analogous to MPG in automobiles.
You also should be concerned about HSPF (Heating Seasonal Performance Factor.) This rating is used in measuring the heating efficiency of a Heat Pump. The higher the number, the more efficient the unit. Analogous to MPG in automobiles. The current industry minimum is 6.80 HSPF.
Please understand that these are not "real-time" values guaranteed by product vendors, but rather standards based values accepted across the industry to allow consumers to make intelligent decision about the differing quality tiers on a level playing field.
Trust that this makes sense…
Agreed, except the present Federal HSPF minimum requirement has been 7.70 since January 2006. Although there seems to be conflicting info on this, the fed web sites say this:
Q8: What exactly does SEER mean?
A8: SEER stands for Seasonal Energy Efficiency Ratio, the Department of Energy’s measure of energy efficiency for the seasonal cooling performance of central air conditioners and central air conditioning heat pumps.
The 2006 standards will essentially raise the energy efficiency standards to 13 SEER for new central air conditioners and to 13 SEER/7.7 HSPF for new central air conditioning heat pumps. The standards will apply to products manufactured for sale in the United States as of January 23, 2006. HSPF stands for Heating Seasonal Performance Factor, the Department of Energy’s measure of energy efficiency for the seasonal heating performance of central air conditioning heat pumps.
Originally Posted by faith
Faith and kuryakin,
Thank you both for your explanations. But I still don't understand how two differnt units can have the same EER but one will have a higher SEER rating. Seems to me, in my simple mind, they should move somewhat in lock-step. The higher the EER the higher the SEER. Does the energy cost of the AH play into it?
Basically, EER is measured at one set of conditions, SEER is a seasonal average, over a specified range of conditions. Since various units don't perform comparably at all temperatures, there will be differences between the single condition EER testing uses, and the range of conditions SEER testing uses.
Yes, the AH enters into it. Everything does. It's total heat in/out divided by total electrical energy input of all components in the system.
Originally Posted by mchild
EER is measured at 80 indoor air 95 outdoor air running continuosly.
SEER is measured by using the EER above and calculating in a factor for the unit running under a lighter load cycling on and off at 80 indoor and 82 outdoor.
Funny thing is on two stage units the SEER test is done on the low speed (on two speed compressors) and the EER is done on High speed. The two speed compressors in high SEER systems seem to have a lower EER than a single stage system meeting the minimum SEER.
Ah, understanding the nuances is important. Many thanks.