PMA stands for; Preventive Maintenance Agreement. For $150.00 annually, De Hart Plumbing will service your heating and cooling systems. In the Spring/Summer you will get your cooling system and water heater serviced. In the Fall/Winter you will get your heating system and water heater serviced. This fee applies to households that have one of each appliance. Program benefits include 10% off products, no overtime charges, longer equipment life, energy savings and healthier, cleaner air. You’re going to be warm in the winter and cool in the summer! De Hart Plumbing, serving Manhattan Kansas, Junction City Kansas and Wamego Kansas.