Hello, When purchasing a new AC system, ensure the unit is sized right for the home's square footage. Purchasing a too-small unit could cause the system to overwork itself and wear out sooner, while a too-big system wastes money. HVAC professionals can help homeowners choose a system that's the right size for their home and cooling needs. For more information about air conditioning installation in Rockford, IL, contact Pearson Plumbing & Heating today or visit https://www.pearsonguy.com/services/air-conditioning/