Just last week I had a tenant complain about burnt plastic smell.

I think they were burning something plastic. 

Repiping the house to plastic pipes from the old iron ones?

Repiping the house to plastic pipes from the old iron ones?

Try your local fencing supplier they often have guys/subs that will pick up jobs they outsource.We did that with a local supplier here & had a couple of guys put in a complete backyard fence, 4ft high black plastic coated wiring, for $2500 including materials that they picked up & hauled.

Tile is more expensive than the fibre-glass/plastic surround that just glue to drywall, because we use backer board to suds.Now in the past for <C-class rentals we were guilty of just gluing up sheet linoleum as a stall surround & they worked great.

If plastic and needs replacement what are you doing with the show surround and plumbing? 

We find asbestos in the Chicago suburbs all the time as a pipe insulation, and the common recommendation is to leave it alone and just wrap it up with plastic wrap or something along those lines to prevent it from crumbling. 

Have one of them one piece plastic shower inserts.

These are also available at Walmart, etc. and act to keep heat from leaving windows.2) Caulking around windows and doors to help seal the air in.3) Putting plastic sheeting over louvered windows that won't crank shut, to at least restrict outside cold air flow.