I had a HVAC technician come to my home last sunday for a furnace problem. He did not fix my problem but did show me how I could make furnace work for time being. While he was here I went to crawl space with him and fetched the tools he neeed for the area was a tight fit for him. He saw no way to fix the furnace and wanted to sell me a new furnace. He has billed me $105.00 for his service. Should I pay the full amount? Is it ethical for him to charge that amount for not fixing the furnace? I have since gone with another tech. who is installing a inducer today that should fix my problem.