Magic air duct cleaning inc

Yes, it is the cheapest duct cleaning you can find in the GTA. By the way, they are located in Burlington, ON, so no early morning appointments. But, I was disappointed that they backed their truck up to our garage (it was raining) and let the fumes permeate our home for 45 minutes. The carbon monoxide alarms were BLASTING while my kids waited on the deck in their raingear. No apologies, just "it happens sometimes". I asked them to move the truck so the exhaust wouldn't point into the garage, but they wouldn't. And they blamed me for not turning off the alarms and that they had to work with this piercing noise that they caused. (I did try, but since the air was thick with gas, it just turned on again. I wasn't about to disconnect any wiring). He said that if I'm concerned I can check myself in at the hospital. I was flabbergasted by his rudeness.
I agree with the others who posted. Customer service is not their concern. I checked the vents, not perfectly clean. But there was residue all over my furniture and floors around the vents, so I guess they did do something. Not a very clean job. They were also 20 minutes late. They blamed it on the traffic - it was an 11am appointment.