He was elected to the House of Commons for Bridport in 1744 (succeeding his elder brother Viscount Deerhurst), a seat he held until 1747, and then represented Worcestershire from 1747 to 1751.
The latter year he succeeded his father in the earldom and entered the House of Lords.
He inherited Croome Court, near Pershore, Worcestershire from his father and commissioned Capability Brown to redesign both the house and surrounding parkland.
Lord Coventry married firstly Maria, daughter of Colonel John Gunning, in 1752.
Lord Coventry survived his second wife by five years and died in September 1809, aged 87.