Preformed winter tune up on Trane gas furnace, unit went through safety’s and heated home efficiently with a 42 degree TD. I left a couple suggestions and will email them over as well. System has no surge protection to protect this equipment and homeowners investment. I spoke to him about the benefits of these and how important they are. In addition system has no condensation safety switch , every year we go to clogged drain lines and some are so extreme that they flood out of pan and through Celine. We add this with install to protect your home but not all companies do. Lastly, I left info on the reme halo. This keeps your air quality top notch and helps with allergies and thing that would make you sick. Our system filters out about 60 percent of the air and our lungs are the other 40 so these whole home air purifiers are very beneficial. Unit running at departure.