The article deals with the how to seal up your air handler and also explains the reasons why this is important. In most of the HVAC systems that I encounter the manufacturer’s cabinets appear to be poorly sealed. This can result in a number of problems with the unit itself, including a greater likelihood of dust and mold building up inside the cabinet and, in certain parts of the country, cause excessive condensation to form inside. Moreover, it can affect indoor air quality if the unit is situated outside the living space of the house, for example in the attic or in the garage.
If it’s outside of the conditioned space
It is generally not advised to put an air handler (or furnace) outside the conditioned area, since the only benefit is that it frees up a little space inside for storage. However, the disadvantages clearly outweigh the advantages because installing it in a garage or an attic can lead to its own problems. For example, if it’s placed in an attic there is a risk of the unit drawing in hot, humid attic air, which will place extra stress on the system and cause the cabinet to sweat. There is also the possibility of high costs if the unit backs up and damages the ceiling. The same risk applies in a garage, although there is additionally the risk of the unit picking up VOCs from cars, lawnmowers and stored chemicals. It is in this situation that proper cabinet sealing becomes important.
How can this affect my indoor air quality?
Air entering through gaps in ceilings or walls may transport contaminants into indoor spaces. Many attics and walls contain fiberglass, which can become airborne. Additionally, attics may harbor mold or animal urine, each presenting distinct health risks. If the air handler is located in the garage, it may draw in fumes from gasoline, paint, oil, pesticides, or other stored chemicals. These substances can adversely affect human health, depending on individual susceptibility and the level of exposure.
What if it’s inside of the conditioned space?
Having your air handler inside the conditioned space is the best spot, but you still need to be careful. For instance, let’s say your unit is in a stand-alone closet with a solid door. If your cabinet openings aren’t properly sealed, it can pull in attic air when the door is closed. This air can come in through any gaps in the drywall that the builder typically doesn’t seal. In Florida, this air is typically very humid, which can cause mold to grow on the ceiling, walls, and ductwork. Ensuring that the cabinet is sealed and the closet has sufficient airflow is key to preventing this.
How to seal up your air handler
Now that we know why you need to seal the gaps in your air handler, you can use any tape you find, as long as it sticks to the cabinet and is easy to remove for servicing. Some HVAC techs prefer masking tape, but as long as it sticks to the cabinet and is easy to remove for servicing, you can use anything. For the condensate and refrigerant lines, you can use a putty like this. If your air handler is in a closet, consider replacing the door with a louvered style to ensure proper airflow inside. This will help keep mold from forming inside the closet.
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