Michael responded to my Yelp service request with a complimentary diagnosis. He came in first thing on Monday and spent an hour diagnosing the problem and was able to find the root cause and fixed the problem right away. He in the end just charged me a hourly service charge and the problem is fixed! I am very satisfied with Michael’s professional dealing on this matter and his expertise as well as fair charging. Would recommend him to anyone for hvac service again! Below is the description of my problem I requested on Yelp: Unfortunately the Ac/furnace has gone out over the weekend. There is no power going to the thermostat either upstairs or downstairs. The display remains empty. It was working fine last weekend. I’ve checked the circuit breakers and they were not tripped but I reset them anyway. I looked it up online to troubleshoot and it said the wiring may have gone faulty that runs from the thermostat to the transformer. Now since this is both ac and furnace not working and simultaneous upstairs downstairs stopped working it must be something specific you would think. Would need a diagnosis and repair on this.