Here’s another very simple, fairly inexpensive tip that can save you a lot of money in heating and cooling bills. Change your air return filters every month. This is a good rule for all 1 inch filters with a 1-month life expectancy. There are a few brands out on the market that can last for up to 3 months, so you will have to decide on your strategy for changing them when you go to the hardware store and compare the costs.
When you don’t change your air filter regularly, it becomes clogged with dirt and dust and pet hair that cause air flow to be restricted in the home. Restricting the air flow means that your units will have longer air handler run cycles, thereby using more energy and putting a greater strain on the units themselves.