1st In Line is a family owned company located in Dallas/Fort Worth. It specializes in providing quality air conditioning, heating, ventilation, duct repair, and installation for homeowners and businesses. We prefer to support and sell American made products. Our purpose is to be there when our customers need us, no matter what day or time it is. We value your space and make every effort to take care of it like our own with the use of drop cloths, mats, and shoe covers.