I have been using Hartz Heating & Cooling Inc. for over 12 years. Their employees always show up on time, and are very polite and courteous individuals. They do a very professional job, which is one reason why I have kept on using them over this period of time. Another thing is their manners. I mean, they have really good manners, Southern manners. They are just very hospitable, and I enjoy being around them. That speaks well of Hartz Heating & Cooling Inc. and I give them Five Stars on everything!