The answer to the cost of an air filter is that it can vary significantly depending on several factors. Generally, a basic air filter for a residential HVAC system can range from $5 to $50, with the average cost being around $15 to $25.
The price of an air filter is influenced by the size, material, and efficiency rating. Larger filters or those with higher MERV (Minimum Efficiency Reporting Value) ratings tend to be more expensive. The type of HVAC system you have and the specific filter it requires will also impact the cost. It's important to get local quotes from HVAC professionals to determine the exact cost for your home.