Your HVAC system works hard year-round to keep your home comfortable—especially in Alabama, where hot, humid summers and chilly winters put systems to the test. But even the most efficient system can’t overcome poor habits or oversights from the homeowner. At Clifford’s HVAC, we often see the same preventable mistakes leading to higher energy bills, reduced comfort, and costly repairs.

Here are the most common HVAC mistakes homeowners make—and how you can avoid them.

1. Ignoring Air Filter Changes

Forgetting to change your air filter is the #1 HVAC mistake we see. A clogged filter restricts airflow, causes your system to work harder, reduces efficiency, and even leads to system breakdowns over time.

What to do instead:
Check your filter monthly, and replace it every 1–3 months depending on your system and household (especially if you have pets or allergies).

2. Blocking Vents and Registers

Placing furniture or rugs over vents might seem harmless, but it disrupts airflow and forces your system to work harder than necessary.

What to do instead:
Keep all supply and return vents clear of obstructions so your HVAC system can properly circulate air.

3. Setting the Thermostat Too Low or Too High

Cranking the thermostat down to 60°F won’t cool your home any faster—it just keeps your system running longer, increasing energy use and strain.

What to do instead:
Set your thermostat to a reasonable, energy-efficient temperature:

• 78°F in summer

• 68°F in winter
  Use a programmable thermostat to optimize temperatures while you’re away or asleep.

4. Skipping Routine Maintenance

Just like a car needs oil changes, your HVAC system needs regular tune-ups to operate efficiently and prevent major issues.

What to do instead:
Schedule HVAC maintenance twice a year—once in spring (for cooling) and once in fall (for heating). Preventive maintenance extends system life and saves money in the long run.

5. Trying DIY Repairs

YouTube might be able to help with some home projects, but HVAC isn’t one of them. Incorrect DIY repairs can cause more damage, void your warranty, and create safety hazards.

What to do instead:
Call a licensed technician like Clifford’s HVAC for diagnostics and repairs. It’s safer, faster, and often more affordable in the long run.

6. Closing Off Unused Rooms

Some homeowners close off vents in unused rooms thinking it saves money—but it can actually increase pressure in the ductwork and throw off the balance of your HVAC system.

What to do instead:
Leave vents open in every room. A zoned system or smart thermostat is a better solution for customized comfort.

7. Not Upgrading an Outdated Thermostat

Older thermostats can lead to inefficient temperature control and higher energy bills.

What to do instead:
Upgrade to a smart or programmable thermostat to gain better control, reduce energy usage, and improve overall comfort.

Small Fixes = Big Savings

Avoiding these common HVAC mistakes can help your system run more efficiently, lower your monthly energy bills, and reduce the need for repairs. If you’re not sure whether your system is performing at its best, Clifford’s HVAC is here to help.

Schedule a tune-up, upgrade your thermostat, or let us inspect your system before problems arise.