# PDD | HVAC, Electrical, and Plumbing \[Exercise B\]

**URL:** <https://community.blackspectacles.com/t/pdd-hvac-electrical-and-plumbing-exercise-b/7607>\
**Category:** Real-World Practice\
**Tags:** real-world-practice\
**Created:** [December 8, 2025, 8:20pm UTC](https://community.blackspectacles.com/t/pdd-hvac-electrical-and-plumbing-exercise-b/7607 "2025-12-08T20:20:52Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![kiaragalicinao](https://yyz1.discourse-cdn.com/flex029/user_avatar/community.blackspectacles.com/kiaragalicinao/32/1607_2.png) [@kiaragalicinao](https://community.blackspectacles.com/u/kiaragalicinao)\
**Post date:** [June 19, 2026, 6:04pm UTC](https://community.blackspectacles.com/t/pdd-hvac-electrical-and-plumbing-exercise-b/7607/4 "2026-06-19T18:04:14Z")

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@hamza.waris wrote in with this question:

> [@Welcome to the PDD Community! \[START HERE \]](https://community.blackspectacles.com/t/welcome-to-the-pdd-community-start-here/6752/16):
>
> Hi, I have a question about Real world practice, PDD. HVAC, Electrical, & Plumbing [Exercise B], Question 4 of 10. The correct option is listed as saying, “central systems are more efficient and require less space than water systems”. I think this is wrong, can someone confirm?

The correct answer choice actually states: _ **“Central air systems are typically less expensive and require less space for piping and equipment.”** _

Since air systems use ductwork rather than extensive hydronic piping networks, pumps, and related equipment, they are often simpler and less expensive to install.

Hope this helps!

Kiara Galicinao, AIA, NCARB  
Product Coordinator  
**[Black Spectacles](https://www.blackspectacles.com/en-us/)**

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