General Guidelines for AC Vent Temperature: When the ambient (outside) temperature is between 70°F (21°C) and 100°F (38°C), the air coming from the AC vents should typically be between 35°F (1.7°C) and 55°F (12.8°C).
That will depend. If the AC system is operating correctly, then the air coming out of your vent should be about twenty degrees cooler than the regular temperature inside. So, if you're cooling it and the house is 80 degrees, then you would ideally want the air to be about 60 degrees.
As a rule of thumb, when the ambient air temperatures 70° degrees Fahrenheit (21° Celsius) and humidity 20%, the AC outlet air temperature should be in the 35°-40° degrees Fahrenheit range.
The surface temperature of the exhaust hose of the portable air conditioner is approximately 40°C(104°F) to 50°C(122°F), and it is normal to feel generated heat.
To see if your A/C system is performing, measure the outlet temperature at the vent with an accurate thermometer. Drive the car with the A/C on "max". With temperatures in the 70's to 80's Fahrenheit the outlet temperature should be around 35 to 48 degrees.
Ideally, the AC outlet air temperature should be about 20 degrees cooler than the ambient air temperatures.
Temp the Air From the Air Conditioner
Put the thermometer on the vent and let it take the temperature of the air coming out of it for about five minutes. You can use a weather thermometer or a cooking thermometer.
Ideally, there should be a temperature differential of around 14° to 20° Fahrenheit between the incoming air and the air being blown out by your air conditioner. This means that if the air entering the system is 75°F, the air coming out of the vent should be between 55°F and 61°F.
Do not set the air conditioning system too cold and do not direct the airflow directly at your head or neck, as you could easily catch a cold. The ideal temperature is between 22 and 25 degrees.
At Manta Performance, we recommend that your EGT stay under 550°C (as measured at the turbo outlet) to assure your engine's safety. What happens when your EGT gets too high? Nothing good! Certain parts of your engine can fail due to the excessive heat produced.
During the summer, the ideal room temperature is between 22 and 26 degrees Celsius. This temperature range is considered comfortable for most people during the summer months, as it helps keep the room cool while providing a comfortable living environment.
Potential Risks to Your Vehicle
Overheating is a common concern when idling with the AC on, especially on hot days. While modern vehicles are designed to handle short periods of idling, prolonged idling can potentially cause damage to the engine, radiator, or other cooling system parts.
According to the Department of Energy1, 78° Fahrenheit is the sweet spot for air conditioners to balance energy savings and comfort when people are at home and need cooling. But in reality, this is a question that doesn't have a “one size fits all” answer.
While the standard room temperature of 72 degrees Fahrenheit is commonly favored by many, others argue for higher settings, particularly when it's hotter outside.
Sometimes, when the room temperature doesn't match the thermostat setting, the problem could be dirt buildup on its interior parts. A dirt coating around the inner components may create excess heat and cause the thermostat to give the wrong readings.
If the temperature is set to below 16 degrees inside a car, or 18 degrees in a room, the evaporator will ice-up, potentially damaging the AC, as the pressure of the refrigerant gets too low.
A common rule of thumb is that most models can function properly only above 68 degrees Fahrenheit. Any lower temperature will result in the system freezing up. In addition to a frosty refrigerant, the piping and coils could also become covered with ice.
Although many vehicles deliver a toasty 135° to 155°, 115° to 120° is acceptable. If the air temperature is okay but airflow is weak, the problem is the blower or a dashboard ductwork problem. Heater register temperatures not even close to 115° to 120°?
Without enough refrigerant, the evaporator coil inside your air conditioner gets too cold. As condensation forms, the cold evaporator coil turns this condensation into ice. That's why one of the biggest manifestations of a frozen AC unit is an evaporator coil that's turned into a block of solid ice.
Now, from the example above, with 75 degree air being pulled in at the air filter, what temperature should we expect to be blowing out? Well, the general consensus is somewhere between 14 to 20 degrees colder than the intake temperature. From my example, 55 to 61 degrees would be an acceptable range.
Acceptable vent temperature (center vents) is 40 degrees or less; this would be a good performing A/C. The 15-20 degree delta is for home systems and would never be considered good for a car. On a 90 degree day the car would never cool off with 70 degree air coming out the vents.
First, check your filters and coils for dirt and debris that may be impeding airflow. Once you've cleaned the filters and coils, run the air conditioner with just the fan so that the ice accumulation can melt off. If the AC still doesn't blow cold air, it could be that refrigerant levels are too low.
Heat pumps usually produce air that is 85-92°F. This is plenty warm to heat your home to your desired 72°F. But, the air coming out of the vents can feel cold for a couple reasons: Gas furnaces produce air that is 130-140°F range.
Check the Air Vents
While your AC is turned on, hold your hand up to the vents. If you cannot feel any air coming out of the vents, your blower might be broken or your ductwork might be disconnected. Another potential sign of a broken AC will be air that is warm or lukewarm instead of feeling crisp and cold.