Hollywood Police Chief Tomas Sanchez said that the authorities were investigating the deaths and looking at every possibility, adding that nothing would be ruled out, including a criminal angle to the investigation.
In Hollywood, the Rehabilitation Center said the hurricane had knocked out a transformer that powered the air conditioning.
"It's a sad state of affairs", said Sanchez, who said investigators believe the deaths at the Rehabilitation Center were heat-related and said the building has been sealed off and a criminal investigation was underway.
Around 115 residents of the retirement home in Hollywood, north of Miami, were immediately evacuated after a nearby hospital began receiving patients suffering from heat-related problems.
There they found "several patients in varying degrees of medical distress", officials said in a report.
Three died at the nursing home, and the rest died after being evacuated to Memorial Healthcare System facilities, city officials said.
Hollywood spokeswoman Raelin Storey said one patient died on Tuesday and the body was taken away by a funeral home.
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He said it was "inexcusable" that no one appeared to have called 911 as residents in their 70s, 80s and 90s sweltered without air conditioning in the summer Florida heat overnight.
Florida Power & Light said in a statement late Wednesday afternoon that it was limited in what it could say because of the investigations.
At least eight nursing home residents have died in Hollywood, Florida, according to city officials.
Jeffrey Nova said he learned of his mother's death Wednesday morning from a reporter who got his name and contact info from a nursing home employee.
On his visit to Anguilla, Boris Johnson, the Foreign Secretary, said: "There are things we are going to have to do in the long term to make this island more economically self-sufficient and even more resilient, and we will certainly be thinking about that". Three more were found dead on the second floor of the facility after rescue units were called in. The staff used fans, put cold towels and ice on the patients, and gave them cold drinks.
At least six people appeared to die of carbon monoxide poisoning from generators in Florida, the AP news agency reported.
Robert Gould, a spokesman for NextEra Energy Inc.'s Florida Power & Light, said utility representatives had met with Broward County officials in early March.
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Florida Governor Rick Scott also ordered emergency workers to check on nursing homes and assisted living facilities to ensure residents are safe.
Police say that the 145 patients who were sent to Memorial Regional Hospital include four from Larkin Community Hospital Behavioral Health Services - a facility that shares a building with the Rehabilitation Center.
Jack Michel, the sole person listed on the nursing home's corporate registration in Florida, appears to have been accused of fraudulent activity in the past.
While the state considers nursing homes high power priority centers it remains unclear why power remained off at the center days following the storm. But the extent of the damage has been an unanswered question for days because some places have been unreachable.
In Broward County, more than 212,000 electricity accounts were without power Thursday morning, state officials said.
"We need to make sure we're doing everything we can to keep our seniors safe during this hard time", he said.
Irma: Five dead at Florida nursing home left without power
They found three people dead and evacuated 145 people to hospitals, many on stretchers or in wheelchairs, authorities said. Jack Michel. "There are a number of critical patients", said Hollywood spokeswoman Raelin Story.