Problem: We experienced low air flow in our vents so we changed our air filters, then looked at the unit in the attic to find that our evaporative coils were frozen and (what I think are insulation mats) located above and below the blower are being sucked in by the blower. We ran the fan alone with the ac off to defrost the coils but the insulation mats were still blocking the air flow. My question is what is the purpose of these mats and will our unit be okay without them? If they must be replaced, will we be able to purchase and replace it ourselves? Thanks for your time & may God bless all your endeavors!
Answer: Thanks so much for your blessings, interest in our website and the opportunity to do business with you! Thanks for asking a great question! Yes, I have seen what you describe happen several times before. The mats which are glued to the metal body of the furnace or air handler come lose and restrict the air flow going into the blower! The insulation mats are used to reduce noise and prevent heat or cold (winter time) transfer, build up inside your air handler. Without the mats you might get noisier blower air flow and you might get some heat entering the return from the hot metal duct work in your attic. The insulation keeps the heat out so that you do not get hot air pulled into the return. If it was me I would try to purchase some spray glue at home depot to re-attach the insulation pieces. Sheet metal shops use a special duct work insulation glue to glue the insulation in place. If the glue does not hold I would remove the inside insulation and insulate the duct work on the outside. Here in Louisville, KY it is HVAC code to have ducts insulated in unconditioned spaces like attics and crawl spaces. The insulation keeps the duct work from heat or cooling lose or gain. The supply lines are insulated to keep them from sweating water in the summer time. I hope you can easily get this fixed. I know that nothing is easy when working in the attic. Hope you can work up there in the early morning before it gets real hot! I hope that you have a blessed day and week!
Steve Arnold, https://arnoldservice.com