Thelen completed FOUR projects on my building totalling over $30,000. All bills were paid promptly. TWO of the projects were less than satisfactory. The mini split installation required almost $550 (out of my pocket) to local service contractors for modifactions over the next year to correct problems directly related to the Thelen installation. A zone heating modification never worked properly after a $2500 (paid) installation, Two Techs spent four hours reviewing the problem and stated that the system design was was incorrect. The system design was done by Thelen! I told this to the technitians. For this assesment I was billed $624! I refused to pay for this "trouble call" and told them so. The office/account manager then sent this bill to a collection agency. I documented all of the problems and expenses and provided it to the management who refused to discuss the issues until I paid the collection agency. Now I am dealing with a collection agency for a $624 bill after spending $30k here. read more

I had them replace the condenser for my air conditioning 2 summers ago. Later that summer, it started freezing up. I had them out 5 times over the next year to try to fix it. All they did was make more problems and fix those. I paid Over $500 And the original problem was not fixed. read more

This place must be under new management - Because there's no possible way that they have stayed in business this long gauging their customers the way they do and then berating them on the phone when questioned about it. They don't appear to have ANY regard for customer retention - they simply want to get as much money out of you as possible on the first go. Guy was at our house 2 different times for a total of 1 hr and 50 minutes - they charged us for 3.5 hrs. They were not even willing to discuss this when we called, just told us if we didn't like it we could take them to court. Please find another place to do business with. read more