John and Donald came to replace a broken thermostat. Donald arrived first and worked feverishly to help me quickly, professionally and efficiently. He unfortunately did not have the right part and John came later with the correct thermostat. John checked to make sure everything with the boiler was working correctly and then replaced the broken item. John was also proficient, profesional, pleasant and very capable. He replaced it and checked to see that it was working properly before he left. They were both excellent.
