The maintenance did not know what they're doing on diagnosing furnace heater. They did a quick service which requires no expertise, like change the filter or clean the flame sensor, then charge really high and call it a day. I was informed that Vigor Mechanical is highly reputable and was recommended. I figured they would find out what’s wrong with our furnace heater, because they were called for the same issue three times within the six months period but found nothing. I am not satisfy with their work and will not recommend to anyone. I understand that during this season, they’re really busy, but I was advice from them; if I’m not happy with their service, call someone else. Thank you for your advice.