As my elderly mother often told me... You can always make more money (even if that means not spending), but you can never, ever make more time. Do not delay pleasure until it's too late.
No, the air conditioner is an option. But it's my understanding ALL ETI builds are now coming prewired for air. So you can get one later without a lot of hassle. This is the options page on ETI's webpage for the 5.0TA: The Escape 5.0TA
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