Frank was knowledgeable, thorough, and conscientious. He reviewed the details of the furnace, blower and duct system in our newly-purchased old home. He explained each step of what needed to be done, and compared it to previous work, ie: using larger holes closer to the unit to achieve better cleaning. And although the home had had an annual service contract with a furnace company, and had also been inspected by 2 inspectors in the months before, it was Frank who discovered that the humidifier filter had not been changed likely since installation over 11 years ago. It was full of debris, as were other parts of the system, resulting in heat discrepancies due to the resultant obstruction. He came prepared with the necessary replacement filters, and passed on his actual costs for the parts to us. He identified safety issues and was able to perform extra tasks at the same visit. He was able to make recommendations on regular maintenance which I appreciated, assuming ownership of this home. Now if only I could find as reliable a furnace-repair service...