The reason for that is that a possibly insufficient refrigerant quantity and the related lack of lubrication can cause pre-existing damage. A crane must be used to lift the unit onto the roof while a team guides it into place and hooks it …

Ventilation standards : HVAC units must provide appropriate ventilation to lower the risk of respiratory infections and complications. There is also a tax credit for using a renewable system like geothermal heat. Free cooling systems can h…