WAACCA - a non-profit association for heating, ventilating and air conditioning contractors in Washington State. WAACCA represents firms that provide services to residents and businesses throughout Washington in design, installation, and repair for air conditioning, heating, refrigeration, air purification and ventilating systems.. Each of our members maintain the highest ethical standards of selling, advertising, pricing, installation, and service guided by the principles of honesty and integrity. We are committed to improving the industry by providing the tools our members need to succeed in the industry.