Question

How hot are chemically peculiar stars in comparison to main sequence stars?

Answer 1

They exist in the same range of temperatures as other upper main sequence stars.

Explanation:

“Lower” main sequence stars have temperatures <7000’K. Chemically peculiar stars are part of the upper main sequence set of stars, with temperatures ranging from 7000-30000’K
http://www.annualreviews.org/doi/abs/10.1146/annurev.aa.12.090174.001353?journalCode=astro

“Chemically peculiar” stars differ from “main sequence” stars by unique variations in the abundance of certain elements. This causes some problems for calibration of the temperature determinations but does not otherwise change the star temperature relative to similar main sequence stars.

See the following article for a particularly good description.
https://academic.oup.com/mnras/article/385/1/481/1033275/Effective-temperatures-of-magnetic-chemically