Top 10 HVAC Troubleshooting Mistakes Homeowners Make

A well-functioning HVAC system is essential for keeping your home comfortable throughout the year. However, when something goes wrong, many homeowners attempt to troubleshoot the issue themselves, often making mistakes that can lead to bigger problems. While some minor HVAC issues can be addressed with simple fixes, other troubleshooting errors can cause inefficiencies, higher energy bills, or even damage your system.

To help you avoid these costly missteps, here are the top 10 HVAC troubleshooting mistakes homeowners make and what to do instead.

1. Neglecting to Check the Thermostat

One of the most common and simplest mistakes homeowners make is overlooking the thermostat. If your HVAC system is not heating or cooling properly, check the thermostat settings first.

It seems simple, but for many HVAC problems, this is a great first step. Make sure the thermostat is set to the correct mode (heating or cooling). Check that the temperature setting is appropriate. Replace the batteries fi your thermostat is battery-operated.

You can also take note of where the thermostat is located in your home. If it receives frequent direct sunlight, you may see skewed readings. Try to keep it as shaded as possible and, if you’re unable to shade the area, talk to your local HVAC professional about your options.

2. Forgetting to Replace the Air Filter

A clogged air filter restricts airflow, making your system work harder and reducing efficiency. Over time, this can lead to system overheating, poor air quality, and increased energy consumption.

You should replace standard filters every 30 to 90 days under normal circumstances. If you have pets or allergies, you should consider changing the filter more frequently to maintain proper air quality.

It’s also important to always use the correct size and type of filter for your system. 

3. Closing Too Many Air Vents

Many homeowners believe that closing vents in unused rooms saves energy. However, doing so can unbalance your HVAC system, causing increased pressure that may damage ductwork or lead to inefficient heating and cooling.

You should keep at least 80% of your home’s vents open to maintain proper airflow. If you need to adjust temperature distribution, consider zoning solutions instead. This will allow you to keep all areas of your home comfortable without increased energy consumption or damaging your ductwork.

4. Ignoring Strange Noises

Unusual sounds from your HVAC system, such as banging, rattling, or whistling, can indicate problems like loose components, duct leaks, or motor issues. Although it can be stressful to think of repairing your unit, ignoring these sounds can lead to even more expensive repairs down the line.

When you hear strange sounds from your HVAC unit, ductwork, or vents, take note of when and where it occurs and contact a professional if it persists. This is the best way to diagnose the problem and catching it quickly may save your unit and your wallet from unnecessary stress.

5. Skipping Regular Maintenance

HVAC systems need routine maintenance to function efficiently. Many homeowners neglect yearly tune-ups, leading to reduced performance and increased wear and tear.

Complete Comfort offers an annual maintenance plan for homeowners. Twice a year, a tech will come to assess and clean your unit to make sure it’s operating at peak performance for the winter and summer seasons. They will clear your outside unit of any leaves, dirt, and debris. They’ll also inspect the interior unit and clean the coils.

This routine maintenance also helps technicians catch any potential problems with your unit before they turn into cause for a full replacement.

6. Attempting DIY Electrical Repairs

HVAC systems involve complex electrical components that require proper handling. Many homeowners attempt to repair electrical issues themselves, increasing the risk of injury or further damage.

If you suspect an electrical issue, never attempt to require or replace electrical components unless you are trained to do so. It is always best to consult an HVAC professional as soon as problems arise.

7. Overlooking Leaky Ductwork

Leaky ducts can waste significant amounts of conditioned air, making your HVAC system work harder and increasing energy costs. Unfortunately, many homeowners don’t inspect their ductwork for leaks, because they’re not aware it’s an issue.

Regardless of the age of your ductwork, leaks are inevitable. Larger leaks can be seen by the naked eye and patched up using HVAC duct sealant or foil tape. However, most ductwork is leaking through gaps and holes you’re unable to see. 

Complete Comfort uses Aeroseal technology to find the leaks and seal them, allowing your unit to work better with less pressure (and even lower your energy bills).

8. Not Checking the Circuit Breaker

If your HVAC system suddenly stops working, the issue may be as simple as a tripped circuit breaker. Many homeowners immediately assume there is a major problem without first checking their electrical panel.

Instead of going into an immediate panic, locate your home’s electrical panel and check for any tripped breakers. If one has tripped, reset it and see if your system beings to run normally. If the breaker continues to trip, call a professional, because this could indicate a larger issue.

9. Setting the Temperature Too Low or Too High

Setting your thermostat to extreme temperatures does not cool or heat your home faster. It only forces your system to work harder, leading to unnecessary strain and higher energy bills.

There is no perfect temperature at which to set your thermostat, but tools like your power meter are great ways to gauge how much energy you’re using. Adding a programmable or smart thermostat to your home allows you to adjust temperatures automatically based on the weather or time of day to optimize energy usage and to keep your system operating in peak condition.

10. Waiting Too Long to Call a Professional

Many homeowners try to troubleshoot HVAC problems for too long before seeking professional help. This delay can turn minor issues into major, costly repairs.

If basic troubleshooting doesn’t resolve an issue, call a licensed HVAC technician, like those at Complete Comfort Heating & Cooling. They’ll help you address small problems early to prevent major breakdowns, and they will help you navigate larger repairs as they become necessary.

Call Complete Comfort

Avoiding these common HVAC troubleshooting mistakes can save you money, prevent system damage, and improve energy efficiency. While some minor issues can be resolved with simple fixes, larger problems require professional attention.

If you are experiencing HVAC issues and need expert help, Complete Comfort Heating & Cooling is here to help. Contact us today to schedule an inspection or routine maintenance to keep your system running at its best.