I've put my toes into the real estate water and I love the temperature.

The plow would need to be welded on so proper install is important.

When I spoke with 2 of the 4 tenants they said maintaining temperatures in the unit was not a problem. 

If this fails open all the time, you will get no heat.If you have electronic controls, there is probably a much smaller temperature sensor (like a tiny bead of epoxy on the end of two tiny wires), and the control board turns the heat on and off, probably using a relay. 

Perhaps @Bill S. could shed a little more light on the local tenancy law.We have wording in our leases that tenants are required to maintain the premises at a temperature of at lease 12C (~55F) even when they are not present.  

I have 2 years experience as a Regional Manager for a Heating and Cooling company. 3 years of welding experience and certifications, Electrical experience, and concrete management experience.

During this period, the minimum temperature is 20C.

Vancouver will always have the most mild temperature in Canada.

Curious, as it's starting to get colder here, I'm thinking about when I will fire up my furnace for my four family and what temperature to set it to.When do you other landlords fire up your furnaces and what temp do you set them at?

Tampa is hot right now, and I'm not talking about the temperature - which has plummeted to the low 70s this weekend.