I contacted with K- Jet Air Duct & Carpet Cleaning company, they will send me a copy of price listing soon. Around $150 for each house I believe. Now we have around 8 families. Initially I set up the cleaning time on this Sunday. I will contact with you who PM me already, thanks.

清理公司给我发来了报价,如下:
Between Waterloo and Markham is 1.5hr drive,we don't charge you extra for the traffic fee.The price we offer is even lower than the price we have in Torotno.

* The promotion price for duct cleaning is as the following, (it's the same best deal as before)
1). Connecting fee : $30
This includes two connecting from our truck to your vent and return air system.
2). $3 per register (vent and return air)
3). $20 for furnace cleaning ( if needed )
4). $10 per access opening ( for house that has no access hole to connect with, i.e.
never done the duct cleaning before. This is a one time charge only )
* If paid by cash, we'll make the price tax included.
* If our clients pay by check or need an invoice, a 5% GST will be applied.

来的时间很准（我已是倒数第二家）。服务态度非常好，所有问题都非常详尽耐心地解答。价格确实非常便宜，只有本地公司广告价格的一半都不到。

因为价格相差太大，我在想是否他们的做法和别人不同。事后我看一网上的一些视频，相比之下他们就没有做得像视频上的那么到位。由于没有事先看，也就没有问他们。如果问了，我相信他们会给我解释的。

视频上的清洗，是把每个register都打开（不论是侧面的固定的，还是地板上活动的），先用刷子伸进去刷一下，有些管道用刷子手动刷，有些用气动的伸进去捣一下，再用高压枪吹。好的公司有视频探头给客户看。

我们这次请的这家公司，非固定的register他们也打开了，但用螺钉封闭的他们就没有打开，然后用气动的高压枪在每个口吹一下，但没有进去刷。Furnace边上的管道他们倒是用气动的刷头伸进去捣了。

本地公司的报价$8/register, 他们的报价是$3/register. 我不知道报$8/regsiter的本地公司是怎么做的。希望做过的朋友也交流一下。