I bought a home that was 1.2 million dollars but that came with an air conditioner from the dark ages. We knew as soon as we bought that it's days would be limited. DSB came to the house and showed us our options and instead of just replacing it, actually opened up our HVAC runs so that the flow of the house was better in every room. Heat was improved, time running per day was decreased and our smart nest thermostat confirmed all the things they said digitally.
We have had them back to install the AC now and have moved from a 1.5 ton to a 3 ton ac. It's quieter running and saves us money. Over the ownership of the home, it should even make us a little back.
Will be using them again on all my properties in the future.
Photo is of the unit they removed.