By Melissa Russo

Mayor Bloomberg’s entourage is getting creative about trying to keep his parked SUVs cool in hot weather, without idling the engines.

Workers put a room air conditioner in a window of one of his SUVs, according to The New York Post.

A source told NBC 4 New York Wednesday that the unit was ordered by the NYPD for the police detail assigned to protect Bloomberg. It was specially constructed in a city workshop, and the source said the mayor did not know about it ahead of time.

Mayoral spokesman Stu Loeser told the Post it was an experiment to be used on extremely hot days. He said even with the vehicles parked in the shade, the temperatures inside can rise to more than 100 degrees.

The SUVs carry communications equipment that can get overheated.

In 2009, the AP reported Bloomberg was letting his parked SUVs idle all over the city. He apologized and said he would stop.

The city’s idling limit is three minutes.

Read more at NBCnewyork.com.