Roof top units Larger buildings generally need more powerful air conditionning, heating, and ventilation, but the power that comes from these heavy-duty roof top units also come with more complicated repair. In these cases, not many companies are able to eficiently repair or install units that can weigh more than two tons. When your building’s system malfunctions, call us so we can help assess your situation and off" you the best course of action, be it a simple repair, or an entire installation.