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In this example sentence,
[時計]{とけい}がないので[家中]{かちゅう}を捜{さが}した。
I searched all over the house for the missing watch.
Jim Breen's WWWJDIC (and Jisho, and tangorin.com) list 家中 【うちじゅう; かちゅう(家中); いえじゅう】 whole family; all (members of) the family; all over the house
The suggestion here seems to suggest that it 家中 is read うちじゅう
Do these various readings have different meanings or registers?
家中{うち/いえじゅう} has two meanings. One is "an entire house", the other is "all people living in a house".
家中{かちゅう} has three meanings. One is "the inside of a house", another is "all people living in the house", and the other is "generic name of vassals of a feudal lord in Edo period".
However 家中{かちゅう} is rarely used in present days as the meanings of "the inside of a house", "all people living in the house"
Source: https://dictionary.goo.ne.jp/srch/jn/%E5%AE%B6%E4%B8%AD/m0u/
