How To Seal Air Handler Plenum In Attic

I missed out on giving specific instructions on one part and they messed it up.

How to seal air handler plenum in attic.

Otherwise in the summer months the warm air that is under your home will rise up through the floors and cause your air handler to sweat. Learn how to seal yo. Using a duct sealant called mastic is the professionals choice. When you re done sealing your attic bypasses push the insulation back into place with an old broom handle or stick as you back out of the attic.

Condensation on the outside of your air handler can be an effect of an underlying issue. The grille in the photo on the left brings air into a return air plenum under an air handler platform. Make sure that all metal fittings are firmly screwed together on four sides then covered with liquid or tape mastic and fully re insulated. Air sealing your ducts is cheap and easy and it save s a lot of money.

Then finish up by sealing the access hatch with self sticking foam weatherstrip photos 10 and 11. Create or modify an air sealed closet to contain the air handler and the return air plenum. The air in your vented attic is hot and humid just like all outdoor air in florida. There are many different ways to seal this crawlspace including plastic sheeting the application of foam insulation to the foundation walls on the inside of the crawlspace and more.

Use aluminum tape to seal joins between two flat smooth surfaces usually metal and mastic for irregular surfaces such as wood. Moreover the excess moisture can lead to a damaged plenum mold or termites. Aluminum tape and mastic can be found at well stocked hardware stores or through amazon. However air handler sweating is different.

If your hatch rests directly on the moldings like ours did add 2 1 2 in wide stops around the. As shown in the infrared image on the right the plenum is not air sealed so hot attic air is being pulled into the air handler closet. Energy saver first look into the attic when helping improve a home s ene. I had them seal all of the inlets to the air handler the supply and return plenums all the attic holes.

There are two main ways to solve this problem. Here are the most common reasons for air handlers sweating so you can stop the condensation. When working with mastic wear disposable gloves and spread it carefully since its glueyness makes cleanup difficult. I even had them open the air handler and seal inside following manufacturer s guideline.