Down Low: if you have your air return lower on your wall it will function better as a cold air return. This will allow your air return to draw in cold air as it sinks to the bottom of the room. Making it more efficient at recirculating this cold air through your furnace to repeat the heating cycle.
If your HVAC system is blocked up or clogged somewhere, your AC won't send enough cool air through the vents when it's running. A fan problem can also cause this issue. Or, you can end up with that problem if you don't address the circulation issues. It's not always easy to realize a circulation problem in the summer.
Putting filters in air return vents is generally not recommended for several reasons: Airflow Restriction: Return vents are designed to allow air to flow back to the HVAC system. Adding filters can restrict airflow, leading to reduced efficiency and potential strain on the system.
To fix this, you could look at enlarging the existing return grill or adding an additional return grill. You would need at least another 176 square inches of free space or roughly 270 square inches of filter space. So something like a 14x20 should put you at that threshold.
Don't cover your return unless your certain that your furnace/AC doesn't need the extra cfm to operate. Your air handler/furnace can only supply the amount of air it can pull to it through the return.
A lack of return air can cause your HVAC system to overheat, leading to frequent shutdowns or overheating warnings. This overworking can also result in the air conditioner blowing warm air, especially in high temperatures.
One way to help combat this problem is to modify your cold air return ducts for better airflow. Whenever possible, expand your existing ducts vertically by cutting out pieces of wallboard and installing a new cover and air filter to fit.
To resolve weak airflow issues, it is recommended to: check and replace air filters regularly. clear any obstructions near vents or registers. inspect and maintain the blower motor.
Due in large part to the short cycling issues mentioned above, components on an oversized heating and/or air conditioning systems are more likely to fail sooner than those on a properly sized system. As a result, you may end up having to replace your HVAC system sooner than expected.
You should never block your air return vents. Period. However, if you're looking to keep your home cooler in the summer, you can try closing lower supply vents and keeping upper ones open, allowing cooler air temperatures to come in from above and sink throughout your house.
Instead, there should be at least one return vent in every room, with two or three being ideal. If your house has only one return vent, this is not a problem — make sure to keep the doors open in every room so the air can circulate properly. Make sure there are no furniture, draperies, rugs, etc. blocking return vents.
As the air gets sucked into your return vent, the return vent filter blocks out dust and particles from entering the airstream to your HVAC unit. Return air vent filters are sometimes preferred over using a filter in the HVAC unit for these reasons: Filters in return vents prevent dust from getting in your ductwork.
If your AC is cooling but not working properly, it could be due to issues like a clogged filter, low refrigerant, or a malfunctioning thermostat. Other possibilities include a faulty compressor, dirty coils, or blocked vents, all of which can affect the system's performance.
Conversely, in the Winter heating season, you will want to pull the coldest air back to the furnace to be warmed and create circulation. In these months, you'll want the lower air return open and the upper air return closed.
Lots of things can cause your blower to have trouble, especially if it gets too dirty. A fan clogged by dirt, a stuck wheel, broken motor, or a loose fan belt are all common problems that reduce the amount of airflow you feel coming from your vents. How to fix: Call an AC tech to examine and fix the blower.
Common Issues with Return Ducts: Clogs and Leaks
You can generally identify a blocked air duct by a distinct drop in heating and cooling efficiency, increased energy costs, and occasionally a musty, dusty smell throughout the home.
A duct booster fan improves airflow in HVAC systems by pushing air through ducts, ensuring every room receives proper heating or cooling. It's akin to giving a gentle push-to-air movement. However, their effectiveness depends on proper installation and addressing any existing HVAC system issues.
Use Multiple Fans
When planning out how to circulate air with fans, look for opportunities to create a network of circulators throughout the house to work the naturally colder air in some places out to other areas of the house that collect heat.
If you're facing this issue, there could be several reasons for it, including outdated air conditioning systems, blocked vents, dirty filters, leaking air ducts, or inadequate insulation.
Check your vents to see if they are not obstructed in any way. Remove any furniture or drapes blocking the airflow. While you are checking all the vents in your home, take a piece of cloth to clean the dust off the vents' grills. Fix any leaks and holes in your HVAC ductwork.