While it might seem like both sides of an air filter are identical, they're designed quite differently. This intentional design plays a vital role in the filter's function. The structure of an air filter is such that one side is typically more porous than the other.
Air filters have arrows printed on the sides of them that show you which way they are supposed to be installed. These arrows should be pointing in the direction that air flows through your system, which is away from the supply ducts and (typically) toward the blower.
The most common problem you will face with a backwards facing filter is simple inefficiency. If your furnace is forced to blow air through the non-porous end of a filter, it will take more energy to do so. The blower will be overworked and you will pay more money for your heating.
What if there is no arrow on the air filter? If there's no arrow on your air filter, just make sure the side with the frame (usually the cardboard or metal side) faces the furnace. The flat side of the filter should face the return air duct.
Running your AC for any time without an air filter is not recommended due to the permanent damage it can cause to the HVAC system. Dirt and dust that is normally absorbed by the filter can make its way into the AC system and wreak havoc on the mechanical components, often leading to expensive repairs.
If the filter is placed in the wrong direction, the finer pores on the other side of the filter will make it difficult for air to pass through the system. When that happens, there will also be a decrease in the cooling performance of the AC.
Incorrect filter installation or installing the wrong filter can leave your engine open to dirt and debris. When the engine's air intake is not completely covered by a filtering element, extensive damage can occur.
How Often Do I Need to Change Out My Air Filter? Generally, most air filter manufacturers and HVAC companies recommend changing your air filter every 90 days, or 3 months. That can change based on where your home is located (ex. dusty, dry climates), if you have any pets, and the age of your system and equipment.
Place your device at least 6 inches from walls, furniture, or other items while in use. Place your air purifier near the most likely source of indoor air pollution. Consider investing in an air purifier that shuts off automatically with a timer. Place your air purifier in a room where you spend most of your time.
The simple answer is: not for long. Ideally, your AC should never operate without a filter for more than 6-8 hours. Going beyond this can negatively affect both your system's health and your home's air quality.
First, check your filters and coils for dirt and debris that may be impeding airflow. Once you've cleaned the filters and coils, run the air conditioner with just the fan so that the ice accumulation can melt off. If the AC still doesn't blow cold air, it could be that refrigerant levels are too low.
A clogged air filter can cause more harm than good. During the day, your AC should cycle on and off, but a dirty air filter can make those cycles more frequent than they should be. Cycling is not only noisy, but it also wastes energy.
The air filter comes with a little arrow that indicates the filter's orientation. It is as important to fit the filter correctly as it is to choose the right one. Depending on your level of expertise, it is recommended to call in a professional to set up your air filter so that you do not mess it up.
While this is certainly possible, it opens the door for mistakes, such as installing the furnace filter backwards. Installing an air filter backward can damage your furnace or HVAC system, as the airflow will be decreased dramatically.
Here's an easy way and simple guideline to follow: When installing the air filter in the HVAC unit, ensure the arrow should always point towards the blower. This direction ensures that the air flows through the filter material correctly, thereby effectively trapping the particles.
Is my AC not working because of the filter? Potentially, yes. While there are a whole host of issues that could cause problems with your air conditioning system, a dirty air filter should be the first thing to check if your central air conditioning unit isn't working as properly as it should.
Can a dirty air filter cause high-speed idle? Yes, dirty air can damage the air-fuel mixture, causing inefficient combustion and potentially running the engine at a higher speed.