I have used two different types of guages to measure vent temp and get different readings from both, was wonder which one is the best to use.
The infared non contact one verses the dial guage with long probe, the infared one always give a colder temp about 20 degrees colder, even on different vehicles
Using a non contact thermometer will not accurately measure air temperature it is actually measuring whatever it is pointing at in this case you are checking the temperature of your duct work not the air coming from it so a mechanical dial or mercury thermometer you put in the air stream is considerably more accurate if it is any good to start with and you can tell that by putting it in some ice water.
Edited: Mon September 08, 2008 at 10:31 AM by Spector
Just to add what has already been suggested. You may need to calibrate the dial thermometer also.
I use a digital thermometer w/ a probe that is usually sold as a weather checking device. Probe goes into the vent and wire it out to the front of the condensor that way you can see both temp readings at the same time.
Newbie wanting to learn how to fix his 01 Civic AC in this freaking hot Dallas TX area.
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