A late-night call from a resident at Kingswood Home in Worthing resulted in the arrival of six ambulances, with three patients taken to hospital.
Kingswood Home provides care for dementia patients over 65, and currently holds a Requires Improvement rating from the Care Quality Commission (CQC).
Reports suggest that paramedics found that the home was without heating on their arrival.
The home has confirmed that it is doing everything in its power to ensure the safety of residents.
Meanwhile, CQC head of adult social care inspection in the South East James Frewin told the BBC: “We have been made aware of some significant safeguarding concerns at Kingswood Home on Heene Road, Worthing.
“Inspectors visited the service on 17 and 18 February and have been working closely with WSCC and other stakeholders.”
Despite Kingswood’s Requires Improvement status, it was actually rated Good in three categories – safe, caring and responsive – in its latest inspection last March.