So you think opening the return air filter grille, and looking to see if it, and the return box are sealed, is too hard to do?
no i was referring to someone telling them to remove ceiling registers.
Originally Posted by shophound
Find a supply vent grill in the ceiling and pull it off. If there's a gap between the supply vent sheetmetal (called a "boot") and the drywall, that is part of your problem. This gap can be sealed with caulk or duct mastic (latter is preferable).
When the supply grill is on, and this gap between ceiling drywall and boot remains, back pressure off the grill will force cold air into the attic, which equates to air lost from the home. If it escapes the conditioned space, it is a loss of air volume, which has to be made up from somewhere.
You should also consider ways to seal your attic access, and all other penetrations through the ceiling into the attic.
Been more then one thread here. Telling customers to seal their registers, because their contractor didn't, and wouldn't.
I've been out to more then one place that the customer couldn't get the register back on right, after they had removed it to paint around it.
So they paid me to put it back on.
I don't view them looking to see if its sealed, any different then removing it to paint around it.
It is their home.
Just like its their car, if they want to change the oil themselves.
My house is under negative pressure when the a/c is on. I can feel air being sucked out of the attic access door. I'm assuming it is being sucked under the front door as well. I checked the duct work in the attic and didn't see any noticeable air leaks. What else would cause negative pressure?
attic air enters the space below or cold air goes up into the attic?
cold air leaks out your front door or humid air is sucked in through the door frame?
Is this a single story or two story house?
Are the supply and return grilles in the ceiling?
Is there a central return grille off of a hallway near the attic access?