The technician (David) who came to do maintenance was very thorough. He saw a potential issue with one of our 2 units and suggested a safety condensation switch on just the one. He didn't give us a hard sell but explained how it worked. After we heard it made sense for us to have this switch installed. And good thing. When he installed it he did find that there was a plug starting that would have caused a drainage backup soon. In fact we had had a problem a few years ago with this same unit with the drain pipe getting plugged that caused a small flood upstairs and resulted in our having to call our insurance to fix the issues it caused. So we are grateful. Thank you David for the courtesy and expertise you show your customers.