I doubt you could lock any therm and it would keep them from manipulating the temp.You know thos commercial plastic boxes over therm, that have vent holes.....in the summer I can blow on them and the air will come on!

Ours did and we ended up putting a piece of plastic molding at the bottom for a better seal.

Hi my name is Felipe Goncalves and i currently work in the plastic industry in Leominster, MA.

They have tons of brand new equipment, they plastic wrap entire loads of dirt, etc. 

I am not interested in some cheap plastic shed or similar (sorry, no offense).

The belly board had been cut (that’s the plastic that holds the insulation in under the trailer) for previous plumbing repairs.

The bathroom walls were done in what looked like tile, but cop a quick feel and you'll find that it is actually some sort of plastic paneling.

FWIW, the bath ceiling is plastic tile in a drop grid. 

At a micro level, if those jet fittings in the tub are white plastic that has turned yellow, you can make them look at lot better by removing them and spraying them with white spray paint that is intended to adhere to plastic.At a macro level, if you want to modernize the bathroom with a lot of work, move the toilet to the shower area and enclose it in a separate room.

I was doing some plumbing this past weekend connecting CPVC to cast iron and the 3/4" CPVC compression fittings will fit around the 1/2" iron pipe.I don't think the sharkbites or the white plastic compression fittings will work though just the CPVC compression fittings.Here's a picture of it:They are $3.92