# A/c

**URL:** <https://community.cartalk.com/t/a-c/15294>\
**Category:** Maintenance/Repairs\
**Created:** [June 14, 2008, 12:08am UTC](https://community.cartalk.com/t/a-c/15294 "2008-06-14T00:08:11Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![tjdepere](https://avatars.discourse-cdn.com/v4/letter/t/90db22/32.png) [@tjdepere](https://community.cartalk.com/u/tjdepere)\
**Post date:** [June 14, 2008, 12:08am UTC](https://community.cartalk.com/t/a-c/15294/1 "2008-06-14T00:08:11Z")

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In the desert which A/C vent to use? The outside air vent or the inside circulated vent The temperature is usually 95 early morning, 100 @ noon, 105 late afternon. Humidity maximum 20% this time of year–usually less.

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [June 14, 2008, 12:11am UTC](https://community.cartalk.com/t/a-c/15294/2 "2008-06-14T00:11:46Z")

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When the AC is on, the setting should be on recirculation.

Tester

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**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\
**Post date:** [June 14, 2008, 11:18am UTC](https://community.cartalk.com/t/a-c/15294/3 "2008-06-14T11:18:17Z")

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I would use recycle most of the time. Start there and then try otherwise and see what you like.

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**Author:** ![Beadsandbeads](https://avatars.discourse-cdn.com/v4/letter/b/c57346/32.png) [@Beadsandbeads](https://community.cartalk.com/u/Beadsandbeads)\
**Post date:** [June 15, 2008, 4:10am UTC](https://community.cartalk.com/t/a-c/15294/4 "2008-06-15T04:10:38Z")

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I assume that you are looking for a fast cool-down. If you parked in the sun use the outside air initially with the AC on to blow out the hot air. If you really have 20% max RH, you won’t have a latent heat load at all. (That is HVAC-speak for removing water from the air.) When the inside air is cooler than outside, switch to recirculate.