I'm looking to prove my friend wrong.

He always wants to press the button to "use only air from inside car", instead of using the air from outside. He says the AC will be colder since it doesn't have to take the hot air from outside.

Is he wrong?? Hmm. Then wouldn't all the air from inside the car be all nasty with everyone breathing (and farting)?

Hmmm.

Appreciate any advice. Thanks.

Dan

 

No. I use the recirculate 99% myself otherwise all the crap from outside gets sucked in.

Your friend is correct.

 

Really? Hmm. Oh well.

Thanks

 

on the highway I use fresh air, moving car seems to force more air though the cowling at that speed

Is he wrong?? Hmm. Then wouldn't all the air from inside the car be all nasty with everyone breathing (and farting)?

Theres a difference between cooler air and stinky air,
Personally I have mine on fresh air 99% of the time, not because its colder or hotter, I just leave it that way unless I pass by a farm or a POS with smoke comming out of his exhaust then I hit the recurculation button.

 

Your friend is correct Makes sense if you think about it, when its recirculating, it's cooling air that has already been cooled, so makes sense that it's going to be colder then it constantly cooling hot air.

When ever I'm in the city, I'll have it on recirculate, can't stand the fumes from cars, gives me a headache

 

Don't leave it on recirc too long. You 'll pass out from lack of oxygen.

Conversely, don't leave it set on outside air too long either. Pressure will build up and the car may explode.

 

I guess it's a catch 22 either way

But does anybody notice any temperature differences between the 2? For some reason I thought when recirculate was on, the air was a bit less cooler.

 

I know my car cools of A LOT faster when set to recirc. On hot days, the AC cant even keep up when set to outside air.

 

It really makes a difference when it is humid as well as hot. When you turn the AC on, the first thing that happens is the AC removes the moisture from the air. Once the humidity inside the car is reduced to a certain level that has a name and I can't think of (dewpoint, maybe?), then it removes heat. So if you are constantly replenishing the interior with humid air, the AC will expend a certain amount of energy trying to remove the humidity rather than cooling the air.

I don't think cars are sealed so well that the occupants can suffocate.

 

It's not the suffocation that you need to worry about. It's the oxygen depleted air inside the cabin. With a car full of people, the oxygen will be replaced by carbon dioxide in short order. Some owner's manuals even say not to leave it in recirc too long.

 

Your car has enoughholes in it that you dont need to worry about running out of oxygen.

Seriously.

 

Isn't that the definition of suffocation?

I really, really seriously doubt any car would be designed so that the occupants can suffocate if the recirc is left on too long. Maybe in a world without lawyers.

 

Yes, I suppose it is. I was trying to say that most people would start to feel funny before they actually passed out from too much carbon dioxide. I was thinking too far ahead thinking that suffocation resulted in death.

 

the air temp at the center vent on fan setting 2 is usually about 5 degrees cooler when set to recirculate. the hotter and more humid it is outside, the bigger the output temp difference is. (in favor of recirculate)

 

On a side note, if you have farting friends even a doorless car won't save you from it...

So in this case it doesn't really matter what mode you use. I am just picky about outside smells like exhaust.. bleh

 

The first few times it was funny, now you're starting to look like you really think that could happen

BTW, Stephen Max is right.

 

It could happen. How long do you want to breath stale air?

 

You're scaring me, and it has nothing to do with stale air.

 

No need to be scared my son.