He scored three goals in three top flight games for the Red Devils and was crowned September's Premier League Player of the Month.
The 36-year-old has used the device since his Real Madrid days in 2013 to keep in top shape, and according to the Daily Mail, who quote The Sun, has had the chamber imported to Manchester from his old home in Turin.
The ice chamber helps boost blood circulation, recovery, and treats human tissue. Ronaldo typically spends three minutes in the chamber at -160 degrees.
Liquid nitrogen is pumped into the air causing the cylinder to cool down, but athletes are advised to spend a maximum of five minutes in the chamber or else risk serious health problems.
Ronaldo has always been vocal about staying fit and eating healthy, and has a diet of six high-protein, high-grain, low-fat mini-meals a day, all recommended by a personal dietician. "Eat regularly," says the Portuguese ace. "It's important to keep energy levels high."