I have used Rockstar for multiple jobs for my Air Conditioning. They are very professional. They usually have people that can come out very fast. They are careful in my home. They are also flexible working downtown - hard to find many times because of building requirements and extra hoops to jump through. I would highly recommend them.They have repaired my rooftop unit , cleaned my inside air handler, installed new registers into the existing ducting. tested and replaced thermostat.