The circuit board on the furnace for our first floor air system went out. Instead of just replacing the circuit board on a 17 year old system we had the ac/heating system (3 ton unit) replaced. They showed up when they said they would. It took them about 5 hours to do all the work, pretty much the length of time they told us it would take. The system works great. We got the 17 SEER two stage system and it works great, it is quieter than our old system was. We are very happy with the work that they did.