I had been using Illiana for regular maintenance on my heating and cooling systems. In December, during a regular inspection of my furnace, they determined I had a cracked heat exchanger on my over-20-year-old furnace. The next day, I went through the options with Dan, the sales representative, and selected a furnace system (I also elected to have a new air conditioner put in as well, since I wanted to upgrade both systems). Unfortunately, over the next day or so, my furnace would periodically stop working, due to the fact that the safety switch and the furnace door were no longer in sync. I called Illiana on a Saturday morning, which happened to be one of the first big snows of the year. They came right out despite the nasty weather and made the fix for no charge to get me through until my appointment for the furnace installation. The furnace installation was relatively quick and went through without a hitch. Jeff, the technician, showed me the system once installation was completed and left no sign he had ever been there, other than the brand new furnace. As promised, Illiana called early in the spring to set up an appointment for a/c install. Again, this was a quick process, although the company had to return to charge up the a/c, since it was a bit chilly on my install date to do so. The charging took longer than anticipated, because the thermostat and a/c were not compatible. Jeff worked patiently through the problem and installed a new thermostat, without charge. I have been very happy with the service I received and the performance of my systems thus far. The price was fair, and the company has been very pleasant to work with. Also, the company extended my maintenance agreement to include an additional 6 months of service since I had purchased the two new systems. Most companies would not have recognized that my regular winter service appointment wasn't actually completed, so I appreciate that.