I was able to get an appointment within a week. The technician was quite friendly, but once he saw my older furnace (probably from 1963) he said that it's not efficient. The burner tubes were rusting and the entire furnace should be replaced. He said he couldn't clean much except for vacuuming the burner tubes in my furnace. The technician said he'll replace the fan belt because it was cracked (which it was), but when he wanted to charge me an extra $40 for the belt, I told him to put the old one back. I later bought a belt at Canadian Tire for less than $10 and replaced it myself. Furthermore, I later hired another company to vacuum my air ducts and he took a look at my furnace for free and said that the furnace is older, but it's in good condition and it'll still heat your home warmer than some of the newer high efficiency furnaces out there. Also, he said that the burner tubes were cast iron, and so it's normal for it to rust based on the furnace's age. he said, "even though the burners were rusting, it'll still last for a very long time, so don't be too concerned about it." In the end, I would not use Best Heating again nor recommend them.