A judge warned that low temperatures in the chamber of the Supreme Court could result in sittings being cancelled.
The Independent reports Chief Justice Mrs Susan Denham brought a thermometer to the bench to show temperatures have been reaching as low as 13.5 degrees Celcius.
In a letter to Minister for State Simon Harris, dated January 30, she wrote:
"This I am loath to do as cases are important and urgent for the parties, but this is a significant health matter.
"The conference room of the Supreme Court was so cold that I brought a thermometer and took the temperature for some days from Monday, January 19th."
Government regulations state a minimum temperature of 17.5 degrees Celcius for a workplace, but readings by Justice Denham were well below this level.
Calling it "entirely inadequate" and a "significant health issue," she says the issue is not new and she had raised concerns in 2013.