The portable heaters are a good idea , UNTIL you get the furnace repaired .

He said the issues they found were (1) we had a portable heater instead of a built in heater (easily corrected) and (2) the neighborhood is zoned mixed use (meaning a studio behind the main house is "probably" OK) but if we want to do it we have to get our individual property "permitted" for multifamily by the city.

The ones that come with the unit are small and light weight to allow for portability of the trailer on the road.

I've never done this but I've heard that the portable shipping containers dont need much as far as rezoning because they are not fixed in place...they are more like sheds.

Sean, In our experience the best practice some of our clients use is to purchase portable fans and leave them in the unit until the issue is resolved.  

Under the old VA Foreclosure system where you had your key and bid online I ran across a fellow investor who had a portable generator in his pickup.

I was able to go into the title company a few times and sign in July  but this week I had 4 sets of construction loans and we did it in my driveway on the title companies customer service reps portable table.. mask gloves fresh pen that gets thrown away etc. 

We have three portable alarm systems...

I don't care for portable space heating units in a rental so it would help if you could elaborate on what you mean by " not requiring them to buy a room heating unit'.

Giving two portable A/C 14,000 BTU units on wheels which can be moved from room to room. 2.