HVAC Services in Simi Valley Certified Five Stars Service, Fully Insured and Bonded California Contractor's License # 829995 U.S. Air Conditioning & Heating specializes in a variety of HVAC services in Simi Valley including installation, replacement, repair and maintenance. We have experience performing HVAC services in homes, businesses and large scale commercial sites. Our company was founded with the goal in mind to provide the best HVAC service possible so that the heating and cooling units that our clients invest in serve them well for many years. A top-of-the-line HVAC system will not serve you well if the installation is done wrong. That is why it is important to hire a professional so that you can rest assured.