If you guess anything about heating and A/C you have honestly heard a single thing repeated ad nauseam to the point where you would just assume that it is regular expertise even among people who guess virtually nothing else about maintaining heating and a/cs.
Say it with me like this: consistently always update your air filters.
This is the most basic level of heating and A/C repair because if the air filter is dirty and obstructed, air cannot flow through your system and the internal components of your heating and A/C system will be choked with dirt and debris and it will eventually beginning chopping down a lot faster than if you had simply swapped out the dirty air filter with a fresh a single, and yes, I assumed it was regular expertise until I recently heard my friend tell me about a house that he recently visited for heating and A/C repair. He is an actual heating and A/C worker and he quite often has humorous stories about shoppers who are clueless. Apparently, 2 years ago, his business had sold this couple a brand new heating and a/c that was top of the line. He had even been involved with the installation process, so he personally knew that there was nothing wrong with the system. Fast forward to this current week when the couple called him up miserable and saying that there was something seriously wrong with their heating and A/C system. They had already jumped to the conclusion that it was a faulty installation and or there had been something inherently wrong with the system itself. He calmed them down and said that he would come out and take a look. Long story short, he immediately went to check on the air filter and discovered it to be entirely caked with dust and dirt and hair that he was able to peel off like a blanket. He then managed to calmly explain to the couple what had entirely happened. They would not own up to how long it had been since they changed out their air filter, even though I wouldn’t be surprised if they hadn’t for 2 years straight!