So why is my heating and cooling system not heating and cooling?
A 4 year old HVAC filter
This is a clear indication no one has serviced this system in at least 4 years.
So why is my heating and cooling system not heating and cooling? Well in most cases the cheapest component of the system is the culprit. Yup the air filter is never cleaned or replaced causing the system to struggle for air flow, which causes other problems that lead to the system failing to perform as intended.
This post is intended to motivate you to remove your air filter so you can take a photo of the correct size, then go purchase a 3 pack of air cleaners, then take a sharpie and write the date on the new filter you are about to install facing the living area so you can easily look and see the last time you changed it.
If you have pets i recommend changing every 2 months or more, if no pets every 3 months should be fine.