Common HVAC Problems and How to Fix Them Nov 12, 2025

When it comes to the comfort of your home, a functioning HVAC system is crucial. Unfortunately, HVAC systems can sometimes encounter problems that disrupt your comfort. At Affordable Indoor Comfort, we understand how frustrating this can be, and that’s why we’ve compiled a list of common HVAC problems and how to fix them. Whether you’re facing a minor issue or a more complex challenge, knowing what to look for can save you time and money.

One common problem is the HVAC system not turning on. This can be due to several reasons, the most common being a thermostat issue. Start by checking your thermostat settings to ensure it is set to the right temperature and mode, either 'heat' or 'cool'. If the thermostat is battery-operated, replace the batteries and see if the issue resolves. Sometimes, simply recalibrating or replacing the thermostat can solve the problem.

Another frequent issue is poor airflow. This could be caused by blocked or dirty air filters, which inhibit the system’s ability to circulate air efficiently. Regularly replacing air filters, ideally every one to three months, can help maintain optimal airflow. Additionally, inspect vents and ducts for blockages or leaks. Ensuring that furniture and curtains are not obstructing vents can also help improve airflow.

An HVAC system that runs continuously without cycling off is another concern. This often indicates a problem with the relay system that controls the heating and cooling cycles. A straightforward fix is checking for a dirty or clogged air filter, which can lead to the system overworking to maintain the temperature. If the problem persists, it may be time to call a professional to inspect the relay system.

Strange noises coming from the HVAC system can be unsettling. These noises often indicate loose parts or debris in the vents. If you hear scraping, banging, or squealing sounds, it’s a good idea to turn off your system and inspect the visible components for any loose bits that can be easily tightened or removed. Regular maintenance checks can prevent these issues from escalating into something more severe.

High energy bills are another indication that your HVAC system isn’t operating efficiently. If you notice a sudden spike in energy costs, it could be due to an inefficient system working harder than it needs to. This might mean your system is due for a tune-up or that it’s nearing the end of its lifespan and could require replacement. Routine maintenance checks by a professional can ensure your unit runs efficiently and help keep your energy bills in check.

Water leaks around the HVAC unit typically stem from a blocked or cracked drain line. Leaks can lead to water damage and mold growth, so addressing them quickly is important. Clear any blockages in the drain line by flushing it with a mixture of bleach and water. If the drain pan is cracked or damaged, replacing it or calling a professional may be necessary.

In conclusion, regular maintenance is key to preventing most common HVAC problems. By taking these preventive measures and addressing issues promptly, you can ensure your system runs smoothly and efficiently, keeping your home comfortable year-round. If you encounter a problem that feels beyond a simple fix, Affordable Indoor Comfort is just a call away. Our team of experts is ready to provide professional and reliable HVAC services to get your system back in top shape.