Some churches sell ad space on the back of their weekly bulletin. Some groups have their own hall/meeting bldg. & you could offer to do a reduced PM for them. The NextDoor app I see is available in Canada. Not sure how big it is in Canada but a lot people here ask for referrals. If one of your customers refers you it’s best but you can also offer to look @ someone’s system or give an estimate if you monitor it. You may also want to read up on “Guerrilla Marketing” techniques. I was thinking there was a book that discussed these techniques for specifically for HVAC but could not locate the name of it. This HVAC Marketing Book did come up but I have not read it. Has some good reviews