We are repeat customers of Hartz Heating & Cooling Inc. and have used them on numerous occasions. The last time they came out, it was to fix the heating and air units in the clubhouses. Like always, they were here on time, and they did a good job for us. We find them to be a very responsive and reliable company, who plays it straight with us. Very honest people. Overall, they go the extra mile for us, and we really appreciate them for that!