kjpro @ usenet.com wrote:

Stick a thermometer in the vent. The A/C should be putting out air
about 20 degrees cooler than the air that goes into the system
(ambient). If you're getting a 20-degree drop, it's as good as it
gets.


You're assuming that a lot of things are correct.

20-degree drop doesn't mean jack ****.

Pssst! This is "alt.home.repair" not "alt.hvac" - you're in the wrong group.