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No, running your furnace without an air filter isn’t better than running it with a dirty filter. Even if it’s dirty, a filter will still prevent particles from blowing around your ducts and your house. However, neither of these options is good for your furnace or your health. Replace your filter once every one to three months for optimal furnace performance and air quality.

Most HVAC service calls include diagnostic fees, which could include checking on a specific issue you’re experiencing or running through a routine inspection checklist. If you called for a particular problem, the service call will also include an estimate to fix the issue, including materials and labor. Depending on your HVAC technician and the service you requested, you might also get a general inspection of your system components to ensure everything is working as intended.

Inexpensive filters do an effective job of keeping your HVAC system clean and running properly. However, they usually aren’t the best at filtering out allergens and other pollutants. So, if you have pets, several people in your household, or allergies and asthma, you’ll want to invest in a higher-quality filter.

According to the Centers for Disease Control and Prevention (CDC), no single water filter or treatment system can remove 100% of contaminants. To find the best filter for your needs, first determine which impurities are most important for you to remove. For example, reverse osmosis (RO) filters are highly effective at removing a wide range of contaminants, including sediment, heavy metals, bacteria, viruses, dissolved salts, and chemicals. However, the RO process can also filter out beneficial minerals like calcium and magnesium. If eliminating bacteria is your main priority, a UV filter could be a suitable choice. Additionally, distilled water is considered the most pure form of filtered water available.