# Simple HVAC Q: Really Basic Coil Sizing

**URL:** <https://boards.straightdope.com/t/simple-hvac-q-really-basic-coil-sizing/283236>\
**Category:** Factual Questions\
**Created:** [January 5, 2005, 6:17pm UTC](https://boards.straightdope.com/t/simple-hvac-q-really-basic-coil-sizing/283236 "2005-01-05T18:17:51Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Jinx](https://avatars.discourse-cdn.com/v4/letter/j/c6cbf5/32.png) [@Jinx](https://boards.straightdope.com/u/Jinx)\
**Post date:** [January 5, 2005, 6:17pm UTC](https://boards.straightdope.com/t/simple-hvac-q-really-basic-coil-sizing/283236/1 "2005-01-05T18:17:51Z")

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Hey, if one upgrades their condensing coil to, say 1.5x that of the present coil’s capacity…doesn’t that behoove one to upgrade the evaporating coil, as well? If not…can you explain why not? (The only thing I can WAG is if we assume the original evaporative coil has a lot of extra capacity, but as I understand it, the two coils are typically sold as a matched set, right?)

Thanks!

- Jinx