I had used Black Diamond on my own property for over 10 years..so when my other property experiences issues with HVAC I always call them...as usual, the service was prompt and well done. They may not be the cheapest but I’ve always been treated well and their workmanship is excellent. New AC was due...over 14 yrs old unit...and they were able to diagnose and replace in 48 hours. My tenant is happy and so am I. And they were able to handle it all over the phone and email since I no longer live in Illinois
