An HVAC estimator analyzes the scope of a proposed heating, ventilation, and air conditioning project to create a detailed estimate of the project’s cost. As an HVAC estimator, you consider the cost of labor and materials and describe what is needed for your client’s consideration. Job duties of an HVAC estimator involve hiring subcontractors, purchasing materials from suppliers, preparing equipment, and assisting with other pre-construction duties. To become an HVAC estimator, you need several years of experience in the HVAC industry. Some HVAC estimators earn at least an associate degree in mechanical engineering or a related field.