The heat complaint

. The contractor said his employees wouldn’t work the site if temperature not set at 70 degrees. I realize it’s the dead of winter. I’ve just put in a new HVAC unit. Construction debris can ruin the unit. The heat runs when they are not there. Then I shut it off when they arrive. I do this for two reasons to protect my HVAC unit and I cannot heat the house if the doors are open. what do they do when they are in a construction site when there’s no heat? I suggested they bring blow heaters. Also, one day I saw the worker going in and out of the house with short sleeves and no coat. He didn’t look cold to me.