andygold

Instead of sealing the coil cover with silicone, you may want to try a product called Seal 'N Peel by DAP. It's like silicone, and comes in a white with green caulking gun tube. Thing is, it's totally removable. Once dry, you can easily peel the stuff off in long strings. I use it to seal the expandable curtains on the sides of window mount air conditioners. I seal the tops and bottoms of the corrugated flexible plastic using a caulking gun to keeps bugs out. It dries in a few hours if you point a fan at it. Then at the end of the summer, I peel it off and can take the A/C unit out of the window. It does not stain or pull paint off the walls. I have not tried to seal a MD coil cover, but I think it would be perfect. I've purchased it from Lowe's for around $7 a tube, but I've also seen it sell for as much as $12, so shop around.

Who makes the cover itself? Is it one of Deanos'?