The fact that you can lift the door to get it to latch tells me that it is likely the installer did not install long screws through the top hinge into the 2" x 4" or 2" x 6" that creates your opening ... read more
I say insulation should be at the top of your list. I would also take a look at your water pumps.
Here's a few of the items we actuallyp ersonally suggest when going green: http://xtremegreenhomes.com ... read more