Best Co2 Detectors in Milwaukee WI

We called them in June to install a Nest Thermostat in our home. We have three thermostats, so I didn't expect it to be easy, but I thought a professional could figure it out….or know enough to tell us that they weren't going to work. It took Jared 2 hours to install one of them and he was very proud that he made it work, but even after he left I had a feeling that something was wrong. Four months later when we switched to Heat, we couldn't get any warm air to blow in the upstairs zone. I called Dickenschrauf to see if they would come look at it to make a wrong a right, but they weren't willing to come without the minimum service charge. I am a reasonable person and would have paid them if it was unrelated to the Nest install, but they were very defensive about and I didn't want to risk it since I felt they had the upperhand and could have told me it was un-related when maybe it really was all related. I hired another Contractor who came and very quickly assessed (and confirmed with the Manufacturer) that our HVAC System is not compatible with the Nest thermostats. I am now back to our original setup, but have spent hundreds of dollars on service & have a Nest I can no longer use or return. I wish the Technician would have had the knowledge, resources, and experience to tell me that the Nest was not going to work for our System rather than spend time trying to get it to partially work. I am disappointed in the whole process and hope they learn from this situation and spare someone else the headache and expense.