Do not miss an opportunity to join. Westenn Heating and Cooling. a rapidly growing HVAC company in Walworth County Wisconsin. Where we are dedicated to supporting our people and our three core values. Profession, honest and value. Position Details. The position is a business-to-business commercial/residential HVAC sales position, in which the purpose of the estimator/project manager is to plan, sell, execute, and monitor all projects they sell fr...