Consult with a reputable installer before purchasing a rooftop unit for placement on the ground. A licensed or certified air-conditioning specialist can review the unit you are considering and confirm suitability for ground installation. The advice could help you avoid purchasing a unit only to learn later that installation requires extensive modifications.
Installation of any AC unit should be completed by an experienced technician. Attempting to install the unit yourself could be dangerous, with possible exposure to electric shocks or cuts from spinning blades. Perform a background check on an installer by contacting your local chapter of the Better Business Bureau. If possible, purchase the unit from the installer so you’ll have a single point of contact if issues arise.
Rooftop units are usually larger than ground units because they house more components. The larger size of the rooftop units may make them appear unsightly outside your home compared to single-package units. In addition to the extra bulk, the rooftop unit may make more noise than a standard ground unit. That could raise complaints from neighbors, especially if houses are relatively close together in your neighborhood.
Putting the rooftop unit on the roof could provide some advantages. Some thieves target ground AC units to sell them for parts. Placing the unit on the roof provides protection against those thieves. Units on rooftops are also protected from damage by lawn mowers. A stone tossed from a mower could damage refrigerant lines, resulting in a service call and repair.
Some rooftop AC units are designed to work on electricity or gas and allow you to switch between energy sources. That allows you to monitor fuel prices and select the less-expensive choice. Ask your technician about such models.