After a hot spell our heat pump was no longer able to cool our house. Based on Yelp reviews I started calling vendors. Environmental was the second place I called, and they were able to come out the same day, so we went with them. The technician arrived promptly, was tidy and courteous. I described the symptoms and he quickly identified the problems. After replacing a blown capacitor he was able to demonstrate that the refrigerant level was slightly low, and patiently explained all the ways this could have happened and how it would make a difference to properly balance the levels. He estimated 2-3 lbs but was able to bring the system up to spec with 1.5 lbs. Very satisfied with the service and they guarantee their work for a year.