Yes, it's possible to replace only the outdoor air conditioning unit without replacing the indoor air conditioning unit, but it's important to consult with a professional air conditioning technician to ensure compatibility and efficiency. Replacing only the outdoor unit may also affect the warranty of the indoor unit, so it's important to consider all factors before making a decision. If you're unsure, contact our team of experts at St. Clair's Custom Air for guidance and professional air conditioning repair and air conditioning services.