Common Air Conditioner Mistakes That Can Cause You Problems

By Brandon Schramm, Service Manager at Comfort Solutions
Many homeowners have AC issues during the hottest months, and many of those problems come from small mistakes that are easy to avoid. Below, we’ll break down the most common air conditioner maintenance, installation, and repair missteps that can lead to poor performance, higher energy bills, or even system breakdowns. Avoiding these problems starts with knowing what to look for. 

Air Conditioner Maintenance Mistakes

Maintaining routine maintenance is one of the easiest ways to ensure your AC works well throughout the summer. When you skip simple tasks or forget important checkups, your system will wear down quicker. Here are some common maintenance mistakes homeowners make and how to avoid them.

Forgetting to Replace or Clean Air Filters Regularly

Your AC filter traps dust, dirt, and allergens so the air in your home is clean. When that filter gets clogged, airflow drops, your system works harder, and energy bills go up. It can also lead to more allergens moving through your home.

Most homes should replace or clean filters every 1 to 3 months, depending on use. Set a reminder on your phone or calendar. It’s one of the easiest ways to keep your AC running efficiently.

Skipping Annual Professional Inspections

Your AC needs a yearly checkup to stay in good shape. During a service visit, a technician can check refrigerant levels, coils, and the drain line. These inspections catch small problems before they turn into big ones. Schedule your maintenance visit in spring, before the summer heat kicks in. This way, you’re ready to go when temperatures rise.

Blocking or Obstructing Vents and Registers

When furniture, curtains, or rugs block vents, they limit airflow and make your system work harder. The result is uneven cooling and added strain on your AC. Make sure vents are open and clear of dust and clutter.

Not Calibrating Thermostat Properly

Setting your thermostat too low will not cool your house faster. It will only force your AC to run longer, which will wear it out and raise your bills. Calibrating your thermostat correctly keeps you comfortable without overworking your system. Consider using a smart thermostat that adjusts automatically and saves energy when you’re not home.

Ignoring Bad Smells, Leaks, and & Strange Noises

If your AC smells odd, leaks water, or makes strange sounds, don’t ignore it. These signs may mean mold, loose parts, or something leaking inside the unit. Catching these problems early helps you avoid bigger, more expensive repairs in the future. It’s always best to get it checked sooner rather than later.

Accepting Weak or Inconsistent Airflow from the AC

Weak or uneven airflow can signify clogged filters, duct problems, or a system beginning to fail. If certain rooms feel cooler than others, or if air isn’t flowing like it used to, it’s time to schedule a service call. Don’t wait until it stops working completely. 

Air Conditioner Installation Mistakes

A brand-new AC system should make your home more comfortable and efficient, but if installed incorrectly, it can lead to years of frustration. Here are some of the most common installation mistakes that can hold your system back from the start. 

Incorrect AC Unit Size for the Home

If your AC unit is too small for your home, it’ll struggle to keep up because it’s running constantly and still not cooling things down properly. On the flip side, a unit that’s too big may cool too fast without removing humidity. This leaves your home feeling damp and uncomfortable. 

The right fit matters. Make sure your contractor does a proper load calculation before recommending a system. That way, you get one sized just right for your space.  

Failing to Insulate Ducts and Connections Properly

Cool air moves through ducts to reach different parts of your home. If those ducts aren’t insulated well, you’ll lose a lot of cool air before it gets where it’s needed. That means your AC has to run longer and harder. 

Good insulation keeps temperatures steady and helps your system run more efficiently. Ask your installer or tech to check insulation during setup or service visits.

Poor Ductwork Design or Sealing

Even if your AC unit is great, poor duct design can ruin its performance. Leaky or poorly placed ducts lead to weak airflow, warm spots, and wasted energy. It’s important to have properly sealed and laid out ductwork to match your home’s size and layout. If airflow seems off or uneven, a technician can test your ducts and suggest fixes.

Placing the Thermostat in a Poor Location

Where your thermostat sits in your home matters more than most people think. If it’s near a window, oven, or in direct sunlight, it can get the wrong temperature reading and run the AC when it’s not needed. The result is higher energy use and less comfort. A hallway away from heat sources typically works best.

Air Conditioner Repair Mistakes

When your AC goes wrong, it matters most that it is fixed correctly and at the right time. Ignoring problems or trying to fix things yourself can lead to more damage and higher repair bills. Here’s what to watch for.

Not Addressing Refrigerant Leaks

Low refrigerant is a major cause of AC problems. If your system isn’t cooling like it should, there might be a leak. Running the AC without enough refrigerant puts stress on the system and leads to bigger issues quickly. Call a professional if you notice weak cooling or ice on the lines. They can test the system, fix the leak, and recharge it safely. 

Putting Off a Necessary AC Replacement

Sometimes, repairs just aren’t enough. Older AC units start to lose efficiency and break down more frequently. If your system is over 10-15 years old and keeps giving you trouble, it might be time for a replacement. While a new unit is a big investment, it saves you money in the long run through lower energy bills and fewer repairs. Today’s systems also offer better comfort and more consistent performance. Talk to a trusted HVAC pro to see if a replacement is the best move for your home.

Delaying Repairs for Minor Issues

That small rattle, short burst of warm air, or musty smell might not seem like a big deal, but it often is. Minor issues can quickly become expensive repairs if you don’t treat them early on. If something seems off with your AC, don’t hesitate. Getting it looked at now could save you money and hassle later. 

Attempting DIY Fixes Without Proper Knowledge

Fixing your AC may seem simple, but doing it yourself is risky. You could accidentally damage a part, void your warranty, or even create a safety hazard. AC systems have electrical components and refrigerant that require training and tools to handle safely. When unsure, call in a professional. It’s not worth the risk to try fixing it yourself. 

Don’t Let Common AC Mistakes Ruin Your Summer

Small AC mistakes can lead to bigger problems if they’re not addressed early. From forgetting filter changes to delaying repairs, these simple slips can hurt your system’s performance and home comfort.

Call Comfort Solutions today to schedule your summer AC tune-up. Don’t wait until your system breaks. Stay calm and comfortable all season long!