Recent Review: Our AC stopped cooling properly a few days before we were scheduled to have company. Not only was it not cooling the house, but the heat exchanger was leaking water all over the basement floor (this had happened a couple of times before). Rather than repair our aging system (again), we decided it was time to replace the AC and furnace. We contacted several heating-cooling companies, and 911 Mechanical was the only one that said they'd be able to get the replacement installed before we needed it that weekend. One of the owners came out that Tuesday to discuss our needs. He was thorough and knowledgeable, and clearly explained our options without any pushy salesmanship. As we were replacing the entire system, the owner also included duct cleaning, a new humidifier, and a new thermostat as part of the deal (more about the thermostat later). True to their word, they came out on Friday morning to install the new system. They arrived promptly at the promised time (in fact, 8 minutes early). The installers were very professional. They had to work part of the time outdoors in the rain, which they did without hesitation. When they finished the installation, one of the installers explained the operation of the entire system, including the new humidifier. The only glitch was with the new, all digital thermostat. Even the installer who was trying to explain its operation was having trouble figuring out how to program it correctly. It looked very cumbersome and difficult to use. Eventually we requested that he simply put our old reliable programmable thermostat back on, which he was happy to do. We were very pleased with 911 Mechanical and are happy with our new heating-cooling system. UPDATE: After writing this review we discovered one issue with the installation. When installing the drip pad bypass humidifier, the installer connected its power directly to a power transformer, rather than taking the time to wire it through the furnace and thermostat. As a result, if the humidistat was calling for moisture, the humidifier water inlet solenoid was always on, whether or not the furnace was actually running. In other words, water was flowing into the humidifier, through the pad, and down the drain all the time, even when the furnace was not running. We called 911 Mechanical to have this addressed, but were told on the phone that the installation was correct and that was the way the humidifier was supposed to operate. This made no sense to us (why run water down the drain when the blower is off). We paid another company to come out and rewire the humidifier through the thermostat. Now the water runs only when the humidistat calls for moisture AND the furnace blower is on.