Spring Service Contracts F amily o wned and operated for over 35 years, D & D Heating & Cooling, Inc has been installing systems in new and existing construction. D & D Heating & Cooling has earned a reputation as one of the Lehigh Valleys most quality-conscious HVAC installation firms. D & Ds company slogan, "Your Comfort Is Our Concern, " provides a concise summary of our business philosophy. Both builders and homeowners can be assured that when D & D tackles an installation, it will be done right and function properly. More important, if a problem does arise, we will correct it quickly and courteously.