As many know I have a multipurpose enclosed trailer that I bought this spring, http://www.northwestfirearms.com/off-topic/97184-truck-trailer-solar-pic-finally.html For a winter project I was considering insulating it. It does not get used much in the cold months and when it does the forced air heat does a good job at keeping it warm. In the summer time when I use it most it becomes an oven. Right now the celling has no insulation but the main part of the walls has the foil sided foam boards loosely put in it. I have read a bit about insulating stuff and there seems to be a lot of opinions. With the way the trailer is built I would be able to easily insulate the roof and walls but none of the doors or the floor. I figure the floor would not be much of an issue since I am trying to keep heat out vs cold coming in. I will be able to put good seals so air does not come in around the doors. Will the lack of insulation on those areas make it pointless to insulate the rest? Along with the insulation in the celling I plan on putting on a white sealer on the roof to help. I know when I had my suburban putting foam sleeping pads in the windows and having a fan going for air circulation made a noticeable difference in temperature. I do have 2 of the Fantastic Fans mounted in the celling so I can get some good airflow moving in the trailer.