Though most famously run by former Vice President Dick Cheney, Halliburton Energy Services was run by Thomas H. Cruikshank during the 80s and early 90s.  What was their primary area of operation?
Halliburton The Halliburton Company, an American multinational corporation. One of the world's largest oil field service companies, it has operations in more than 70 countries. It owns hundreds of subsidiaries, affiliates, branches, brands, and divisions worldwide and employs approximately 50,000 people.
Watsco Watsco, Inc. is the largest distributor of air conditioning, heating and refrigeration equipment and related parts and supplies (HVAC/R) in the United States. Watsco was founded more than 60 years ago as a manufacturer of parts, components and tools used in the HVAC/R industry. Under the leadership of its current CEO, Albert H. Nahmad, from 1973 to 1988 Watsco grew from US$5 million in revenues to US$25 million. In 1989, the company shifted its focus from manufacturing to distribution by acquiring Gemaire Distributors Inc., a South Florida-based Rheem distributor. By 1997, Watsco added other OEMs to the mix and moved into commercial refrigeration as a result of the acquisition of Baker Distributing Company. Watsco divested its manufacturing business in 1998, selling it to International Comfort Products Corporation, now part of Carrier Corporation (Carrier). Revenues increased from US$64.1 million in 1989 to US$4.2 billion in 2016 via a strategy of acquiring companies with established market position and subsequently building revenues and profit through a combination of adding locations, products, services and other initiatives.