First they tell you $100 for unlimited vents then that changes of course when they come to your house but fine we paid the higher amount to get our system clean. But now have been calling the company number for 3 days since the service as our furnace will not come back on since they cleaned it and I do not know what they did for me to fix it. Twice someone answered, asked questions and told me they would call me back in 10 minutes. NEVER RECEIVED ANY CALLS BACK. Now it just goes to voicemail. I feel sorry for the guys that work for this company as they were very nice.