Reliance The Furnace Company Edmonton

Positives: Person who sold the furnace to me was professional, responsive to emails, friendly, and knowledgeable. No concerns with the sales team at all.
No concerns with the installed furnace either, it was as described and looks to be working well. Installers were friendly and cleaned up after themselves.
Also great followup from both the main office and the salesperson, with the chance to provide feedback online.
Negatives: I was at home for the majority of the time the installers were installing (several hours). I left to run an errand for 20 minutes, only to return and find that the installers had *drilled into my walls* to install free-of-charge carbon monoxide detectors that I did not ask for (I already have them in the home). I had left my house for the 20 min errand and expressly asked them to call me with any questions or concerns as needed, but they did not bother to call to ask if I would like the detectors installed. For something that ended up being drilled into a very visible part of my main hallway, a phone call would be expected. I find out later by the sales person that this is unusual practice, so I hope that this doesn't happen again to a future client.