Red Oak Air Conditioning and Heating Repair TD Check
A properly operating air conditioner should have a consistent temperature split across the return and evaporator coils. The desired split would range between 16 and 20 degrees F.
To obtain a TD split:
Place a thermometer in a grill or plenum closest to the air handler and another thermometer close to the return air filter. Allow the system to run for 15 or 20 minutes to stabilize and for the thermometers to get an accurate reading. The difference between the two thermometers will be the split.
For example:
The thermometer at return air is 75 degrees F.
And
The thermometer at the plenum or grill is 55 degrees F.
75 - 55 = 20
You have a 20-degree split.
It is essential to use a quality digital thermometer to get an accurate reading.
Do not use a laser infrared thermometer. These are inaccurate enough to get a good reading and usually give a different split each time.
