The Great Filter Debate: How Often Should You Really Change Your HVAC Filter in Summer?

Summer in Ankeny means hotter temps, more time indoors, and your HVAC system working overtime to keep things cool. One of the most common maintenance questions we get at Obsidian Heating & Cooling is about filters. How often should you really change them? Let’s settle the debate once and for all.

Why does your HVAC filter matter so much in the summer?

Because it’s your first line of defense against dust, allergens, and overworked equipment.

Your HVAC filter protects your system by trapping dust, pet dander, pollen, and other particles before they can clog your ducts or damage internal components. In summer, windows stay shut and your A/C runs more frequently—meaning that filter gets dirty fast. A clean filter also helps your system run more efficiently, keeping your energy bills lower and your indoor air quality higher.

How often should you change your filter during summer months?

In most homes, every 30–60 days is best—but some need it more often.

If you have pets, allergies, or a larger household, your filter could clog faster than average. In those cases, we recommend checking it every 30 days. For homes without pets or allergy concerns, every 60 days may be fine. However, during peak summer usage when your A/C is on nearly nonstop, it’s wise to check more frequently just to be safe.

What happens if you forget to change your HVAC filter?

Your system works harder, cools less, and may break down prematurely.

A dirty filter blocks airflow, forcing your system to work harder to circulate cool air. This can lead to hot spots in your home, poor humidity control, and higher energy costs. Even worse, over time this strain can cause your system to overheat or fail altogether. It’s a simple task with serious consequences if ignored.

Is there a difference in filters, or are they all the same?

Not all filters are created equal—some trap more particles, others last longer.

Basic fiberglass filters are inexpensive and need frequent replacement, while pleated filters or HEPA-style filters offer higher efficiency and last longer. If you’re not sure which type is best for your home, Obsidian can help you choose the right one for your system and needs.

Can smart thermostats help remind you to change your filter?

Yes—and they’re one of the easiest ways to stay on top of maintenance.

Many smart thermostats can track your system’s runtime and alert you when it’s time to change the filter. No sticky notes required. If you're due for a thermostat upgrade, ask our team about models that offer maintenance reminders and remote control features.

What’s the best way to make filter replacement a habit?

Set calendar reminders—or let Obsidian handle it with regular maintenance.

You can set recurring phone alerts to check your filter every 30 days, or better yet, sign up for Obsidian’s seasonal maintenance program. We’ll inspect your system, replace filters, and keep your unit running efficiently all summer long.

Need help staying cool in Ankeny this summer?

At Obsidian Heating & Cooling, we make HVAC maintenance easy. Whether you need help choosing the right filter, want a full system checkup, or just have questions about improving efficiency, our team is here for you.

Don’t let a clogged filter ruin your cool—schedule a tune-up with Obsidian today.