Can anyone reccomend a good heating company? I have a york furnace thats giving us problems for the last 2 years and something always seems to be going wrong quite frequently. Getting a diagnostic everytime is costing me 160$ each time then the parts and installation. Furnace is about 12 years old, wonder if its time a replace it. Usually work with a company high and demand heating, but would like a second opinion as theyre visiting my home frequently in the last 2 years! Help.