I have used J's HVAC Unlimited LLC before and they are very friendly people and their service techs know what they are doing. You don't have to tell them to check this out or check that out and follow them around the house. They do a thorough job and you can trust them not to miss anything. They are nice and polite people too, and I enjoy them coming out and working on the system. In fact, they are the ones who installed the system for me. The last time they were here, I think it was to change out the thermostat. They did a good job and overall, I have been very pleased with everything they do! I highly recommend J's HVAC Unlimited LLC to everyone! They are a good heating and air company!