McCullough is one of Austin’s largest family-owned air conditioning, heating, and energy conservation companies. We've been serving the Greater Austin area with trustworthy and dependable service since 1977. We are industry leaders providing quality air conditioning, heating, and indoor air quality service. Some things you should know about us: We are problem solvers and home comfort experts. We are dependable and satisfaction guaranteed. We are all about value and savings. We have ethical business practices always.