Hi, I'm new to this forum and this is my first post. I have a heating problem in my office space, a small internet cafe. Last fall I noticed that the heating was improper and temperature changes abruptly. I contacted a local technician and he did some repair and things were back in order until last month. Now the situation seem to be a bit serious that the thermostat shows false reading at times which is really confusing. I checked on the internet and came to know that it could be an issue with the thermostat or the duct. I really don’t know what exactly the issue is. The technician seem to be incompetent about the situation. So I googled to find out the reason accidentally came across a commercial mechanical service that provide heating solutions and repairs. I'm not sure how well their service are. Any suggestions are welcomed.