HVAC and refrigeration equipment keeps industrial, commercial, and residential facilities properly heated, cooled, and ventilated to maintain a comfortable environment. Heaters provide warmth in the winter. Fans and air conditioners cool off areas in the summer. Air filters help remove dust and other airborne contaminants from the air stream to improve indoor air quality. Thermostats and controls help streamline the operation of HVAC systems to improve their efficiency. Refrigeration supplies are used to maintain refrigerators, air conditioners, and other HVAC equipment that use refrigerant to keep them working as expected.