Yah but I am not there to check capacity of unit. Beenthere you are turning a 1.5hour service call into 2 hours+. I feel that with the test I do it should be more than sufficient. What will efficiency and capacity tests do for consumer and I don't think they will go for the extra .5 to 1hr of tests.
The seer rating can be taken on a running unit. The system is plotted on a pressure enthalpy chart. After that several system parameters are calculated and these parameters are run thru some more calculations to give the seer rating. I would say it is not worth the money to have done on a small unit. If the unit is properly maintained it should be close to its seer rating. In fact if you live in a cooler area, say midwest. Then it will probably run at a little higher seer rating than say in arizona. The seer rating you see when buying the unit is the min it should run at when new.
I do 6 calls a day. They could be all service or sales and service. I then have maybe time to check on Installers and answer calls or emails. This is done 5 Days a week and sometimes I get home at eight. I am losing calls like crazy now. To me it is not a necessary thing on most calls.
I assume you then take tha avg of that and you have your seer rating. That does sound more accurate. I think the premise in the book I read was if the seer rating fell in between the range they give you the unit was performing ok.